EUM.EPS.SYS.SPE.990003
v9E, 14 December 2011
IASI Level 1 Product Format Specification
Document Change Record
Issue / Revision Date DCN. No Changed Pages / Paragraphs
2.0 25/5/99
First Issue
2 Draft B 23/07/99
Addressed RIDs
2 10/07/00
Incorporate change in EPS Generic Product
Specification, Issue 3, and IASI Level 1
product content (IA-TN-2100-9469-CNE,
issue 2 draft, 08/06/00)
3.0 18/07/00
4 Draft A 15/11/00
Add GTS Product section
Simplified document layout
Editorial changes
Incorporated changes in [RD-1]
4 Draft B 22/05/01 LEO/C/TP
Made [AD-2] “IASI Level 1 Product
Contents”, IA-TN-2100-9469-CNE into a
reference document, [RD-1]. Renumbered
other documents accordingly
Incorporated changes from [RD-1] (See also
change notice in Annex)
Removed GTS Section and all references to
GTS products.
Updated text in Section 1.1
Incorporated changes to [AD-1] GPFS
Removed references to product footer
records
Removed idea of “datasets” within a product
as per updated GPFS
4 Draft C 28/05/01 LEO/C/TP
Removed requirement in Level 1a SPHR
section
Updated all sections in line with GPFS
changes
Removed items redundant with GPFS
5.0 01/06/01 CGS PDR Issue
5.1 13/06/01 Revised issue for CGS PDR
Updated signature table
5.2
Reference corrected from
EPS/MIS/SPE/990003 to
EUM.EPS.SYS.SPE.990003
6.0 Draft A 13/02/02
Updated document template
Updated to correspond to updated IASI L1
Product Contents Document,
IA.TN.2100.9469.CNE, Ed. 5, Rev 2
(01/02/02)
Changed [AD-2] from Product Convention
Document to Mission Convention Document.
Updated in line with [AD-1] Issue 6.0 Draft B
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v9E, 14 December 2011
IASI Level 1 Product Format Specification
Issue / Revision Date DCN. No Changed Pages / Paragraphs
6.1 5/4/02
Updated document template again
Updated document in line with revised [AD-1]
Added V-INTEGER types to product
specification
6.2 13/06/02
Updated Annex to allow spectral data in
each MDR to be divided into up to 10 bands
each with its own scale factor. This allows
data size to be reduced from 3 bytes to
integer2.
Added new GIADR to include this scale
factor information
6.3 13/06/02
EUM.EPS.SYS.
DCR.02.129
Updated Table 1 Product IDs to be
compatible with IDs defined in Core Ground
Segment Requirements Document
Updated WBS number and corrected
document reference in header
6.4 1/12/02
EUM.EPS.SYS.
DCR.02.175
Corrected name of bit 76 in Section 3.4.1.3
(typo)
Added text to MDR-VIADR description in
Section 7.3 to describe contents of VIADR-
MDR
Updated Section 6.6.1.4
GccsConfAvhrrChannel
Added Section 3.4.1.3 IDefCcsMode
Added sub sections to Section 2 detailing
computation of wavenumbers, interpolation
ion the spectral database, referencing of
AVHRR co-ordinates and general quality
indices for the product.
Added Record Format Version Control -
section 9.
Updated occurrence tables
See also DCR in Annex
6.5 17/01/03
EUM.EPS.SYS.
DCR.02.251
Annex modified – See DCR in Annex
11/02/03
EUM.EPS.SYS.
DCR.03.042
Inserted new Section 8 with corrected subclass
numbering for GIADRs and added subclass
numbering for MDRs.
6.6 23/03/04
EUM.EPS.SYS.
DCR.04.009
Added Section 2.7 describing differences
between external calibration and normal
operations products
Added Section 2.8 describing decoding of
IASI spectra and images
Added Section 2.9 describing start/stop time
of IASI lines
Added Section 2.10 describing IASI
Integrated Imager sub-grid
Added Section 2.11 describing radiance
analysis in IASI FOV
Section 3.4.1.3 GEPSIdConf extended
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EUM.EPS.SYS.SPE.990003
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IASI Level 1 Product Format Specification
Issue / Revision Date DCN. No Changed Pages / Paragraphs
definition of bits in bitstring
Clarified setting of GqisFlagQual in Section
3.6
Update table of Record Subclass Version
Numbers
See also changes in Document Change
Record of Annex
6.7 18/10/05
EUM.EPS.SYS.
DCR.05.0253
Add IASI IMVD as reference document
Section 3.4.1.1 Add details of Instrument
Mode (word # 19) from IASI IMVD to reflect
CNES Change Request CR-1000-271.
V7A 23/07/08
Migrated into Hummingbird. Body contents
copied into standard template. Editorial
updates – formatting etc.
Signature table updated.
V7B 23/07/08
Added Appendix A with hyperlink referring
to Annex.
Editorial edits – typos, standardisation, use
of auto referencing for document and
section references.
V7C 22/08/08
EPS_AB_DCR_
EUM_73
Update of :
Section 2.10 Figure 1 added to clarify
orientation of IIS (first and second
dimension named IMCO and IMLI).
Section 2.11.3 Correct unit description
added to GccsRadAnalMean and
GccsRadAnalStd for channel 1,2 and 3a
V8 14/10/08
EPS_AB_DCR_
EUM_74
Update of PFS for IASI L1 Day-2 product
format:
1. Add or change of IASI LA/B
a. GQisFlagQual (change)
b. GQisFlagQualDetailed
2. Add or change of IASI L1C
a. GQisFlagQual (change)
b. GQisFlagQualDetailed
c. GIacVarImagIIS
d. GIacAvgImagIIS
e. GEUMAvhrr1BCldFrac
f. GEUMAvhrr1BLandFra
g. GEUMAvhrr1BQual
3. Add or change of ENG-MDR:
a. GQisFlagQual (change)
b. GIacAvgImagIIS
c. NZPDInterpixelEW
d. NZPDInterpixelBB
e. NZPDInterpixelCS
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IASI Level 1 Product Format Specification
Issue / Revision Date DCN. No Changed Pages / Paragraphs
f. GSsdConverFlag
g. GQisFlagDetailed
h. GEUMAvhrr1BCldFrac
i. GEUMAvhrr1BLandFrac
j. GEUMAvhrr1BQual
k. GCcsAvhrrPseudoChn
l. GCcsAvhrrPsCh4FlagQual
m. GCcsAvhrrPsCh5FlagQual
n. DATA_PX (change)
Section 3.4.1.5 GQisFlagQualDetailed
added
Section 5.4.1.5 GEUMAvhrr1BQual
added
Section 6.6.1.7 Description of
GCcsAvhrrPseudoChn added
Section 10 updated to add new record
version numbers.
V9 27/01/09 ODT_DCR_17
Further update of PFS for IASI L1 Day-2
product format:
1. IASI L1A/B/C
a. Change of GQisFlagDetailed
content
2. IASI ENG
a. Change of GQisFlagDetailed
content
b. Remove
GCcsAvhrrPSCh4FlagQual
c. Remove
GCcsAvhrrPSCh5FlagQual
d. Remove NZPDInterPixelEW
e. Remove NZPDInterPixelBB
f. Remove NZPDInterPixelCS
g. Add MHipNZpdInterPixel
h. Add
MHipFlagInterPixNZpdNonQual
i. Split Data_IP into Data_IP and
Equalization Counter
j. Add Equalization Counter
V9A 25/02/09
Typo: References to "GQisFlagDetailed" above
for Versions 8 & 9 should read
"GQisFlagQualDetailed"
v9B 13/10/10 ODT_DCR_155
Added record subclass info.
Corrected two names in Sec. 2.8 to agree
with spellings in Giadr-Scalefactors table:
IDefSondScaleFactor -->
IDefScaleSondScaleFactor and
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Issue / Revision Date DCN. No Changed Pages / Paragraphs
IDefScaleIIScaleFactor -->
IDefScaleIISScaleFactor
Updates to description in table for
GEUMAvhrr1BQual including adding
footnote (
EUM/EPS/NCR/12303).
(Internal use) Replacement of two names
in Signature Table.
v9C 07/12/10
Annex: GEUMAvhrr1BQual description
update.
v9D 01/12/11 STM_DOCET_1
10
Annex only:
Unit correction for GEPSLocIASIAvhrr_Iasi
GEPSLocIASIAvhrr_IIS: from Avhrr pixel
to ms (milliseconds) in MDR-1a, 1b and
1c.
Same thing for
GCcsImageClassifiedFirstLin in the MDR-
1c.
v9E 14/12/11
Annex only: Correction to previous update
to units (see Annex for full details).
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EUM.EPS.SYS.SPE.990003
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IASI Level 1 Product Format Specification
Table of Contents
1 Introduction ................................................................................................................................ 29
1.1 Purpose and Scope ...........................................................................................................29
1.2 Structure of the Document................................................................................................. 29
1.3 Applicable Documents .......................................................................................................29
1.4 Reference Documents .......................................................................................................29
1.5 Array Sizing Parameters ....................................................................................................29
1.6 PPS Produced Product Content ........................................................................................29
2 Format of IASI Level 1 Products ..............................................................................................29
2.1 Overview............................................................................................................................ 29
2.2 Generic Record Header Fields .......................................................................................... 29
2.3 Computation of Wavenumbers ..........................................................................................29
2.3.1 IASI Integrated Imager ..........................................................................................29
2.3.2 Level 1a ................................................................................................................29
2.3.3 Level 1b/c.............................................................................................................. 29
2.4 Interpolation in the sounder spectral database .................................................................29
2.5 AVHRR Coordinates Referenced in IASI Products ...........................................................29
2.6 Quality indices description .................................................................................................29
2.7 IASI instrument “EXTERNAL CALIBRATION” mode ........................................................29
2.8 Decoding of IASI Spectra and Images ..............................................................................29
2.8.1 Introduction ........................................................................................................... 29
2.8.2 Decoding of spectra ..............................................................................................29
2.8.3 Decoding of images ..............................................................................................29
2.9 Start/Stop time of IASI lines ...............................................................................................29
2.9.1 RECORD_START_TIME and RECORD_STOP_TIME .......................................29
2.9.2 In NORMAL instrument mode............................................................................... 29
2.9.3 In EXTERNAL CALIBRATION instrument mode ..................................................29
2.10 IASI Integrated Imager sub-grid ........................................................................................29
2.11 Radiance analysis in IASI Field Of View ...........................................................................29
2.11.1 Introduction ........................................................................................................... 29
2.11.2 Classified image ...................................................................................................29
2.11.3 Class description ..................................................................................................29
2.11.4 Class projection in IASI pixels ..............................................................................29
3 Level 1a Records .......................................................................................................................
29
3.1 Secondary Product Header Record ..................................................................................29
3.2 Global and Variable External Auxiliary Data Records .......................................................29
3.3 Global Internal Auxiliary Data Record ...............................................................................29
3.4 Variable Internal Auxiliary Data Record ............................................................................29
3.5 Measurement Data Records ..............................................................................................29
3.5.1 MDR Fields ...........................................................................................................29
3.5.1.1 GEPSIasiMode ......................................................................................29
3.5.1.2 GEPSOPSProcessingMode .................................................................. 29
3.5.1.3 GEPSIdConf.......................................................................................... 29
3.5.1.4 IDefCcsMode ......................................................................................... 29
3.5.1.5 GQisFlagQualDetailed .......................................................................... 29
4 Level 1b Records ....................................................................................................................... 29
4.1 Secondary Product Header Record ..................................................................................29
4.2 Global and Variable External Auxiliary Data Records .......................................................29
4.3 Global Internal Auxiliary Data Record ...............................................................................29
4.4 Variable Internal Auxiliary Data Record ............................................................................29
4.5 Measurement Data Records ..............................................................................................29
4.5.1 MDR Fields ...........................................................................................................29
4.5.1.1 GEPSIasiMode ......................................................................................29
4.5.1.2 GEPSOPSProcessingMode .................................................................. 29
4.5.1.3 GEPSIdConf.......................................................................................... 29
4.5.1.4 GQisFlagQualDetailed .......................................................................... 29
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IASI Level 1 Product Format Specification
5 Level 1c Records ....................................................................................................................... 29
5.1 Secondary Product Header Record ..................................................................................29
5.2 Global and Variable External Auxiliary Data Records .......................................................29
5.3 Global Internal Auxiliary Data Record ...............................................................................29
5.4 Variable Internal Auxiliary Data Record ............................................................................29
5.5 Measurement Data Records ..............................................................................................29
5.5.1 MDR Fields ...........................................................................................................29
5.5.1.1 GEPSIasiMode ......................................................................................29
5.5.1.2 GEPSOPSProcessingMode .................................................................. 29
5.5.1.3 GEPSIdConf.......................................................................................... 29
5.5.1.4 GQisFlagQualDetailed .......................................................................... 29
5.5.1.5 GEUMAvhrr1BQual ...............................................................................29
6 Engineering Records ................................................................................................................. 29
6.1 Notation ............................................................................................................................. 29
6.2 Secondary Product Header Record ..................................................................................29
6.3 Global and Variable External Auxiliary Data Records .......................................................29
6.4 Global Internal Auxiliary Data Record ...............................................................................29
6.5 Variable Internal Auxiliary Data Record ............................................................................29
6.6 Measurement Data Records ..............................................................................................29
6.6.1 MDR Fields ...........................................................................................................29
6.6.1.1 GEPSIasiMode ......................................................................................29
6.6.1.2 GEPSOPSProcessingMode .................................................................. 29
6.6.1.3 GEPSIdConf.......................................................................................... 29
6.6.1.4 GccsConfAvhrrChannel.........................................................................29
6.6.1.5 GQisFlagQualDetailed .......................................................................... 29
6.6.1.6 GEUMAvhrr1BQual ...............................................................................29
6.6.1.7 GCcsAvhrrPseudoChn ..........................................................................29
7 Verification Records .................................................................................................................. 29
7.1 Secondary Product Header Record ..................................................................................29
7.2 Global and Variable External Auxiliary Data Records .......................................................29
7.3 Global and Variable Internal Auxiliary Data Records ........................................................29
7.4 Measurement Data Records ..............................................................................................29
8 Record Subclasses.................................................................................................................... 29
8.1 GIADR ............................................................................................................................... 29
8.2 VIADR................................................................................................................................ 29
8.3 MDR................................................................................................................................... 29
9 Occurrence Information ............................................................................................................ 29
9.1 Level 1a ............................................................................................................................. 29
9.2 Level 1b ............................................................................................................................. 29
9.3 Level 1c ............................................................................................................................. 29
9.4 Engineering........................................................................................................................29
9.5 Verification ......................................................................................................................... 29
10 Record Format Version Control ...............................................................................................29
Appendix A Detailed Specification of IASI Level 1 Data Records ......................................29
Table of Figures
Figure 1: IASI sounder pixel and IIS pixel orientation ............................................................................ 15
Table of Tables
Table 1: List of IASI Level 1 Products .................................................................................................... 29
Table 2: Record Format Version Numbers ............................................................................................ 29
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IASI Level 1 Product Format Specification
1 INTRODUCTION
1.1 Purpose and Scope
This document is the Infrared Atmospheric Sounding Interferometer (IASI) Level 1 (1a, 1b and 1c)
EPS Product Format Specification. It also includes the specification of the IASI Engineering and
Verification products.
The generic product format specification used by this document is defined in the EPS Generic Product
Format Specification (GPFS)
AD 1. The conventions used by this document are defined in [AD 1]
and in the EPS Mission Conventions Document [
AD 2].
Note: The use of the term “database” in [RD 2] shall not constrain the implementation of the storage
of the datasets referred to in this document.
1.2 Structure of the Document
The document is organised in the following sections, including the introduction:
Section 1
Section 2
Sections 3-8
Section 9
Sections
Appendix A
Appendix A
Provides the scope of the document.
details the product formats for Level 1 products
describe the instrument and level specific records for Level 1 products
details the occurrence rates of the various records within Level 1 products
provides a history of version numbers for the records defined within the
document
links to detailed tables describing the record formats
1.3 Applicable Documents
AD 1 EPS Generic Product Format Specification EPS/GGS/SPE/96167
AD 2
EPS Mission Convention Document EPS/SYS/SPE/990002
1.4 Reference Documents
5' IASI Level 1 Product Contents IA-TN-2100-9469-CNE Edition 5,
Revision 2
5' IASI Measurement and Verification Data IA-ID-1000-6477-AER
Issue 3.1
1.5 Array Sizing Parameters
The values of parameters used for the dimensioning of arrays for the product fields in the annex to
this document can be found in Section 2.1 of [RD 1].
1.6 PPS Produced Product Content
The product content for IASI Level 1 products that is generated by the IASI Level 1 PPS is described
in [RD 1].
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IASI Level 1 Product Format Specification
2 FORMAT OF IASI LEVEL 1 PRODUCTS
2.1 Overview
The EPS format products which are generated by the IASI Level 1 PPS encompasses Level 1a, 1b and
1c products, verification products and engineering products. describes the contents of the Level 1
products, verification and engineering products.
Product Name Product ID Content
Level 1a
IASI_xxx_1A
Decoded spectral and image data after additional radiometric
calibration corrections, spectral calibration appended, location
and co-location with AVHRR/3 images.
Level 1b
IASI_xxx_1B Re-sampled spectrum.
Level 1c
IASI_xxx_1C Re-sampled spectrum with apodisation
Verification Product
IASI_VER_01
Verification data: raw interferogram and calibration
coefficients used on-board.
Engineering Product
IASI_ENG_01
All parameters: output of IASI SW used by the TEC for
evaluation.
Table 1: List of IASI Level 1 Products
The product format for all IASI Level 1 products is based on the generic product format as described
in [AD 2]. This document details the instrument- and level-specific additions required for IASI Level
1 products.
2.2 Generic Record Header Fields
All generic record header fields of the instrument/level specific records defined in this document shall
have an INSTRUMENT_GROUP value of IASI [
RD 2].
2.3 Computation of Wavenumbers
2.3.1 IASI Integrated Imager
The description of the IASI Integrated Imager (IIS) Spectral Response Function (SRF) is provided in
the IASI Level 1 products as an array that can contain up to 100 samples.
The wave number associated with the sample k is given by the formula:
w(k) = IDefIISSrfDWn*(IDefIISSrfNsfirst+k-2)
For example, the wavenumber associated with the first sample (k=1) is equal to:
w(1) = IDefIISSrfDwn * (IDefIISSrffirst-1)
The data IDefIISSrfNslast determines the actual size of the SRF description ((IDefIISSrffirst+k-1) ≤
IDefIISSrflast).
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IASI Level 1 Product Format Specification
2.3.2 Level 1a
The wavenumber of Level 1a spectra sample number k is computed by the following:
w(k) = IDefSpectrDWn*(IDefNsfirst+k-2)*fcs(k)
where the spectral calibration function fcs() must be computed from information extracted from the
IASI spectral database provided to the users (see Section Appendix A)
2.3.3 Level 1b/c
Level 1b and 1c spectra are provided with the same constant sampling. Only the useful part of the
spectra is provided. The wave number associated with the sample k is given by the formula:
w(k)= IDefSpectDWn1b * (IDefNsfirst1b+k-2)
For example, the wavenumber associated with the first sample (k=1) is equal to the following:
w(1) = IDefSpectDwn1b * (IDefNsfirst1b-1)
The data IDefNslast1b determines the actual size of the spectrum
((IDefNsfirst1b+k-1) ≤ IDefNslast1b).
2.4 Interpolation in the sounder spectral database
Level 1a and 1b products usage will imply the knowledge of the current
spectral calibration function : fcs(w,p,CCD),
instrument spectral response function : ISRF(w,p,CCD)
defined for the four pixels (p=1,2,3,4) and the two cube corner directions (CCD=0 or 1) and the
wavenumber, w.
These functions are computed from the following data:
ISdbGridFcs and ISdbGridIsrf extracted from the IASI spectral database provided to the users
GIsfPds1, GIsfPds2, GIsfPds3, GIsfPds4, GIsfLinOrigin, GIsfColOrigin extracted from the
product itself
using the following formula.
i0 = GIsfLinOrigin, j0 = GIsfColOrigin
p1 = GIsfPds1, fcs1 = ISdbGridFcs (k,p,CCD,i0,j0)
p2 = GIsfPds2, fcs2 = ISdbGridFcs (k,p,CCD,i0,j0+1)
p3 = GIsfPds3, fcs3 = ISdbGridFcs (k,p,CCD,i0+1,j0+1)
p4 = GIsfPds4, fcs4 = ISdbGridFcs (k,p,CCD,i0+1,j0)
fcs(k,p,CCD) = p1*fcs1+ p2*fcs2 + p3*fcs3+ p4*fcs4
The same computations can be used to derive the correct ISRF.
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IASI Level 1 Product Format Specification
This computation provides an undersampled spectral calibration function (typically every 15 cm
-1
).
The wave number associated with fcs(k) is given by the following:
w(k )= IDefSafDWn*(IDefSafNsfirst+k-2)
This (smooth) function can now be oversampled to every wavenumber where it is needed.
2.5 AVHRR Coordinates Referenced in IASI Products
Localisation of some reference points is given in AVHRR pixels units (fractional) in order to help the
collocation of IASI products with AVHRR products (e.g. GEPSLocIasiAvhrr_IASI and
GEPSLocIasiAvhrr_IIS).
Columns pose no problem of definition but avoiding ambiguity in row identification is more difficult.
Generally, the time of the line is used as a unique identifier for each AVHRR line and the duration of
the AVHRR line is used to be able to represent fractional lines. The row position in the AVHRR
raster is therefore represented as a time given in milliseconds (relative to a reference time of the
current IASI product).
More precisely, given:
a line numbered u in some AVHRR 1b product
a fraction of AVHRR line x ( 0<x<1)
the reference time of the current IASI line : T
0
the start time of this AVHRR line : T
start
(u)
the end time of this AVHRR line : T
end
(u)
where T
0
is GEPS_IasiDatIasi(SN=1) and T
start
(u) and T
end
(u) are respectively the
RECORD_START_TIME and RECORD_END_TIME extracted from the Generic Record Header of
the AVHRR MDR_1B_FULL record, then the encoded value of the fractional line u+x is given by:
Δt (u+x) = T
start
(u) + x*(T
end
(u)-T
start
(u)) - T
0
where duration, computed as the difference between two times, is converted into milliseconds. The
users can then compute the line number u in any AVHRR product from the values T
0
and Δt extracted
from the IASI product.
2.6 Quality indices description
Quality of the IASI Level 1 products is characterised by the following items:
GQisFlagQual : general quality flag which indicates, when it is set to TRUE (=1), that
some anomaly has been detected at some step in the Level 0 or Level 1 IASI Processing.
The products should not be used if this occurs.
GQisFlagQualDetailed : The flag provides detailed information about the Level 0 (on-
board) or Level 1 processing. The bits are set to 1 if an error has been detected (see Section
Appendix A for details).
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IASI Level 1 Product Format Specification
GQisQualIndex : is the general quality index for the sounder spectra. It is defined as a
ratio: NeDT_estimated / NeDT_expected.
GQisQualIndexRad : radiometric quality index for the sounder product. It is defined as a
ratio: NeDT_estimated / NeDT_expected where the NeDT_estimated takes into account
only the elementary quality indices related to the radiometric performance.
GQisQualIndexSpect : spectral quality index for the sounder product. It is defined as a
ratio (NeDT_estimated/NeDT_expected) where the NeDT_estimated takes into account only
the elementary quality indices related to the spectral performance.
GQisQualIndexIIS : quality index for the IIS image. It is defined as a ratio:
NeDT_estimated / NeDT_expected.
GQisQualIndexLoc. It is defined as the uncertainty of the coregistration between IIS and
AVHRR.
2.7 IASI instrument “EXTERNAL CALIBRATION” mode
During the IASI instrument mode “EXTERNAL CALIBRATION” the data corresponding to SN=1,
SN=2 and SN=30 are not relevant. As a matter of fact, the transmission of the instrument packets is
the same as in NORMAL OPERATION mode except for the sub cycle SN = 1,2, 30 where there is no
transmission for the spectrum and image packets.
1 2 3…. …29 30 31 32 33 34 35 36 37
Scan Moving
Scan Moving
One specific target
Scan Moving
Scan Moving
Blackbody
Scan Moving
First Cold Space
Scan Moving
From the sub cycle SN = 3 to the sub cycle SN = 29, the scan mirror points at one specific target
among all possible targets of the instrument.
On the last seven sub cycles, the calibration process is exactly the same as in NORMAL
OPERATION MODE.
2.8 Decoding of IASI Spectra and Images
2.8.1 Introduction
IASI spectra radiances are coded with several scaling factors (up to 10 scaling factors for one spectra).
Though configurable, these factors will probably not evolve during the time span of the Metop
mission.
IASI images are coded with a single scaling factor. Though configurable, this factor will probably not
evolve during the time span of the Metop mission.
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IASI Level 1 Product Format Specification
As a consequence, a dedicated GIADR has been created (GIADR-SCALEFACTORS) in order to
provide this information to the users.
Note 1: The scale factors found in GIADR from Level 1a shall be used only for Level 1a data
(neither 1b, nor 1c). The scale factors from Level 1b are to be applied to Level 1b. The scale factors
from Level 1c shall be exclusively applied to Level 1c data.
Note 2: In this section, the indices of tables start at 1 (not 0).
2.8.2 Decoding of spectra
FOR numScale=1 to IDefScaleSondNbScale DO
SF = IDefScaleSondScaleFactor(numScale)
FOR(chanNb=IDefScaleSondNsfirst(numscale) TO IDefScaleSondNslast(numscale) DO
w=chanNb - IDefNsfirst + 1
SpectDecoded(w) = Spect(w).10-SF
where Spect=GSmcSpect in the case of Level 1a, Spect=GS1bSpect in the case of Level 1b and
Spect=GS1cSpect in the case of Level 1c.
2.8.3 Decoding of images
There is one single scale factor to be applied to all pixels of one image, with
SF=IDefScaleIISScaleFactor.
2.9 Start/Stop time of IASI lines
2.9.1 RECORD_START_TIME and RECORD_STOP_TIME
For all Level 1 products (1a, 1b, 1c, Engineering, Verification):
RECORD_START_TIME field in each MDR is the start time of the corresponding line in
the product (see §Appendix A and §Appendix A).
RECORD_STOP_TIME field in each MDR is the stop time of the corresponding line in the
product (see §Appendix A and §Appendix A).
RECORD_START_TIME field in the MPHR is the start time of the first line in the product.
RECORD_STOP_TIME field in the MPHR is the stop time of the last line in the product.
2.9.2 In NORMAL instrument mode
IASI start time is the time of the spectra packets for SN (Scan Number) = 1
IASI stop time is the time of the packet IP36
2.9.3 In EXTERNAL CALIBRATION instrument mode
IASI start time is the time of the spectra packets for SN (Scan Number) = 3
IASI stop time is the time of the packet IP36
2.10 IASI Integrated Imager sub-grid
The IASI Integrated Imager (IIS) is sub-sampled in a 5 ˟ 5 sub-grid.
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This sub-grid corresponds to the IIS pixels with column and line number indices from the set {1, 16,
32, 48, 64}.
The dimension of the sub-grid is specified as SGI (=25) in the PFS annex. This SGI corresponds to a
dual-dimension array (for which DIM1=IIS columns and DIM2=IIS lines). The orientation of the IIS
imager and the line and column is indicated in the following figure together with the numbering of the
IASI sounder pixel (1-4).
Figure 1: IASI sounder pixel and IIS pixel orientation
2.11 Radiance analysis in IASI Field of View
2.11.1 Introduction
Data named GCcsxxxx in MDR-1C provide a description of the radiance spatial distribution in the
IASI sounder Field Of View (FOV). This information can be used in many ways when processing
IASI L1 data (e.g. for spectral correction in the case of non-uniform radiance distribution in IASI
FOV).
The radiances used for this analysis are nominally AVHRR measured radiances. IIS radiances can
also be used as a backup. The case is identified by the data IDefCcsMode (value: 0 or 1, cf.
§Appendix A).
When using AVHRR radiances, only a small part of the AVHRR raster is used (typically less than
100 ˟ 100 pixels, covering the four pixels of the sounder). When using IIS radiances, the full IIS
image is used.
Three levels of information are provided. These are described in the next subsection:
Classified image at the full imager resolution
Classes characteristics (synthesis in term of radiance, position in IASI FOV)
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Fraction of pixel sounders covered by each class
2.11.2 Classified image
The classified image is stored in table GCcsImageClassified.
Each pixel of this image corresponds exactly to one pixel of the AVHHR (or IIS) image. Image size is
variable with SN and is defined by line number GCcsImageClassifiedNbLin and columns number
GCcsImageClassifiedNbCol.
Note: I
n the case of IIS image classification, the classified image is of size 62 ˟ 62.
Position of this image in AVHRR raster is defined by the position of Line 1 and Column 1 in the
AVHRR raster: GCcsImageClassifiedFirstLin and GCcsImageClassifiedFirstCol. This detailed
information can be used to map the individual imager pixels into the FOV of the IASI sounder pixels,
however this should not be necessary because synthetic information is already computed by the Level
1 processor. See Section Appendix A.
Class number is limited to 6. The numbering is from 1 to the actual class number found by the
algorithm (variable). The special number 7 is reserved for pixels which have not been assigned to a
class by the algorithm (non-classified pixels).
2.11.3 Class description
A synthesis of the classes spatial distribution is provided by the position in IASI FOV of the
geometrical centre of gravity for each class (data: GCcsRadAnalY and GCcsRadAnalZ).
Class properties, in the radiances space, is given by the characteristics of the cluster containing all the
pixels which belong to the class:
GCcsRadAnalMean : mean value of imager channel data (either radiance or local variance for
the IIS pseudo-channel). The units of GCcsRadAnalMean depends on AVHRR channel. It is
W/(m^2 * sr) for channel 1,2,3a and W/(m^2*sr*m^-1) for 3b,4,5.
GCcsRadAnalStd : standard deviation of the data (which provides information about the
compactness of the cluster). The units of GCcsRadAnalMean depends on AVHRR channel. It
is W/(m^2 * sr) for channel 1,2,3a and W/(m^2*sr*m^-1) for 3b,4,5.
The data are, for each class, a vector of fixed dimension (6) which are always stored in the same
order:
{ ch 1, ch 2, ch 3a, ch 3b, ch 4, ch 5 } if IDefCcsMode= 0 (AVHRR),
{ Brightness Temperature, local variance } if IDefCcsMode= 1 (IIS)
When imager data are not available for a given channel (e.g. for visible AVHRR channels during
night) then the corresponding position is filled with 0.
2.11.4 Class projection in IASI pixels
Synthetic description of the classes present in each sounder pixel FOV is given by:
IDefCcsRadAnalNbClass : Number of classes actually present in the FOV of sounder pixel PN
(including class 7 if any pixels are assigned to this class),
IDefCcsRadAnalWgt : Fraction of the FOV of sounder pixel PN covered by class NCL. Sum
over all the classes (including class 7) for a given (PN,SN) is equal to 1.
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3 LEVEL 1A RECORDS
3.1 Secondary Product Header Record
There is no SPHR defined for the IASI Level 1 products.
3.2 Global and Variable External Auxiliary Data Records
There are no GEADRs or VEADRs defined for the IASI Level 1a product.
3.3 Global Internal Auxiliary Data Record
There are two subclasses of GIADR for the Level 1a product.
Subclass Name Description Subclass ID
GIADR-QUALITY Contains quality information for the product 0
GIADR-SCALE-FACTORS
Contains the scale factors used to scale the
1
spectral data in the MDR
3.4 Variable Internal Auxiliary Data Record
There are no VIADRs in the IASI Level 1a product.
3.5 Measurement Data Records
There is one subclass of MDR for the Level 1a product, MDR-1A.
Subclass Name Description Subclass ID
MDR-1A IASI L1A radiance product 0
The MDR is detailed in 0 to this document.
3.5.1 MDR Fields
3.5.1.1 GEPSIasiMode
Bit
0 – 15
16 – 23
24 – 31
Meaning
Instrument mode: word 19 of instrument packet
During external calibration mode, scan position SP (see word 12 of instrument packet).
00 if not during external calibration mode
Not used
The following table shows details of instrument packet word #19 from IASI IMVD. See also [RD 2],
Section 12.2.
Instrument Mode (Word #19)
B0 to B7 0 (not used)
B8 0: transition to the mode in progress
1: established mode
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B9 to B15 0100001: Normal operation
0100010: External calibration
1111000: Auxiliary Op
During the first line following mode transition, the bit B8 will be set to zero by the instrument for the
four or five first step numbers. After this short period of time, the bit B8 will be set to one.
3.5.1.2 GEPSOPSProcessingMode
Bit
0 – 1
2
3
4
5
6 – 31
Meaning
Input data level ( 00 = Level 0, 01 = Level 1, 11 = Level 2)
0 = normal/auxiliary instrument mode, 1 = external calibration mode
Debug mode (0 = debug mode off)
Interface mode (0 = granule per granule, 1 = dump per dump)
Target type during external calibration mode ( 0 = Earth, 1 = not Earth)
Not used
CNES:
In the §Appendix A of PFS correct the bit 76 of GEPSIdConf to GOPSFltImgCSMiss (typo).
3.5.1.3 GEPSIdConf
Bit
0 - 31
32 – 63
64
65
66
67
68
69 – 81
69
70
71
72
73
74
75
76
77
78
79
80
81
Meaning
PTSI (word 16 and 17 of the instrument packet)
IDefIDConf: ID of the algorithm configuration
Normal processing mode ( 0 = off, 1 = On)
Backlog processing mode ( 0 = off, 1 = On)
Re-processing mode ( 0 = off, 1 = On)
Parallel validation ( 0 = off, 1 = On)
In-plane satellite manoeuvre ( 0 = no manoeuvre, 1 = manoeuvre)
Degraded cases at line level. If the bit is set ( = 1), then the corresponding flag
below has been raised
GOPSFlaPixMiss
GOPSFlaDataGap
GOPSFltIsrfemOff
GOPSFltBandMiss
GOPSFltBBTMiss
GOPSFltImgEWMiss
GOPSFltImgBBMiss
GOPSFltImgCSMiss
GOPSFlagPacketVPMiss
GOPSFlagPacketAPMiss
GOPSFlagPacketPXMiss
GOPSFlagPacketIPMiss
GOPSFlaGeoAvhrrMiss
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3.5.1.4 IDefCcsMode
Bit
31 - 1
0
Meaning
unused
0 = AVHRR 1 =IIS
3.5.1.5 GQisFlagQualDetailed
Bit Meaning
0 Hardware (BIMSCSQ, BIMSSQ1, BIMSSQ2)
1 Band 1 affected by Spikes (BspkFlagSpik B1)
2 Band 2 affected by Spikes (BspkFlagSpik B2)
3 Band 3 affected by Spikes (BspkFlagSpik B3)
4 NZPD and complex calibration error
BZpdFlagNZpdNonQual
BArcFlagCalSpectNonQual
5 On-board general quality flag (BBofFlagSpectNonQual)
6 Overflow/Underflow (GDocFlagUnderOverFlow)
7 Spectral calibration error:
GFaxFlagAxeNonQual
GIsfFlagPdsNonValid
GOPSFltIsrfemOff
8 Radiometric post-calibration error:
GFtbFlagBBTNonQual
GHecFlagDateNonOK
9 GQisFlagQual summary flag for all bands (old flag)
10 Missing sounder data (GOPSFlagPixMiss, GOPSFlagBandMiss)
11 Missing IIS data (GOPSFltImgEWMiss)
12 Missing AVHRR data (GOPSFltRadAvhrrMiss)
13 SPARE
14 SPARE
15 SPARE
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4 LEVEL 1B RECORDS
4.1 Secondary Product Header Record
There is no SPHR defined for the IASI Level 1 products.
4.2 Global and Variable External Auxiliary Data Records
There are no GEADRs or VEADRs defined for the IASI Level 1b product.
4.3 Global Internal Auxiliary Data Record
The Level 1b product uses the same subclasses of GIADR as the Level 1a product.
4.4 Variable Internal Auxiliary Data Record
There are no VIADRs in the IASI Level 1b product.
4.5 Measurement Data Records
There is one subclass of MDR for the Level 1b product, MDR-1B.
Subclass Name Description Subclass ID
MDR-1B IASI L1B radiance product 1
The MDR is detailed in the Annex (0) to this document.
4.5.1 MDR Fields
4.5.1.1 GEPSIasiMode
See Section Appendix A.
4.5.1.2 GEPSOPSProcessingMode
See Section Appendix A.
4.5.1.3 GEPSIdConf
See Section Appendix A.
4.5.1.4 GQisFlagQualDetailed
See Section Appendix A.
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5 LEVEL 1C RECORDS
5.1 Secondary Product Header Record
There is no Secondary Product Header Record (SPHR) defined for the IASI Level 1 products.
5.2 Global and Variable External Auxiliary Data Records
There are no GEADRs or VEADRs defined for the IASI Level 1c product.
5.3 Global Internal Auxiliary Data Record
The Level 1c product uses the same subclasses of GIADR as the Level 1a product.
5.4 Variable Internal Auxiliary Data Record
There are no VIADRs in the IASI Level 1c product.
5.5 Measurement Data Records
There is one subclass of MDR for the Level 1c product, MDR-1C.
Subclass Name Description Subclass ID
MDR-1C IASI L1C radiance product 2
The MDR is detailed in Appendix A of this document.
5.5.1 MDR Fields
5.5.1.1 GEPSIasiMode
See Section Appendix A.
5.5.1.2 GEPSOPSProcessingMode
See Section Appendix A.
5.5.1.3 GEPSIdConf
See Section Appendix A.
5.5.1.4 GQisFlagQualDetailed
See Section Appendix A.
5.5.1.5 GEUMAvhrr1BQual
Bit Meaning
If Bit7 = 0: Fraction in % (0-100) of weighted AVHRR pixels in IASI FOV covered with
snow/ice.
If Bit7 = 1: Number of missing, bad or failed AVHRR pixels (0-127)
7
0-6
0 = no missing or bad AVHRR pixels
1 = missing/bad AVHRR pixel(s)
When all bits are set to 1, this means that 127 or more AVHRR pixels are missing, failed or bad.
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6 ENGINEERING RECORDS
6.1 Notation
The Engineering product is for the use of the IASI-TEC, which requires that a certain number of IEEE
real type values be stored within the product, contrary to [AD 1]. The IEEE real values are stored
within a bit string type of the correct length (64 bits for a real*8 and 32 bits for a real*4). This is
indicated within the Annex table defining the Engineering product using the notation:
bitst(64)[real*8] and bitst(32)[real*4] respectively.
6.2 Secondary Product Header Record
There is no SPHR defined for the IASI Level 1 products.
6.3 Global and Variable External Auxiliary Data Records
There are no GEADRs or VEADRs defined for the IASI Engineering product.
6.4 Global Internal Auxiliary Data Record
There is one subclass of GIADR for the Engineering Product, GIADR-ENGINEERING. This is
detailed in 0 ofthis document.
Subclass Name Description Subclass ID
GIADR-ENGINEERING IASI L1 engineering-data product 2
6.5 Variable Internal Auxiliary Data Record
There is one subclass of VIADR defined for Engineering products, VIADR-ENGINEERING. This is
detailed in the Annex to this document.
Subclass Name Description Subclass ID
VIADR-ENGINEERING IASI L1 engineering-data product 0
6.6 Measurement Data Records
There is one subclass of MDR for the Engineering product, MDR-ENGINEERING. This is detailed in
the Annex to this document.
Subclass Name Description Subclass ID
MDR-ENGINEERING IASI L1 engineering-data product 3
6.6.1 MDR Fields
6.6.1.1 GEPSIasiMode
See Section Appendix A.
6.6.1.2 GEPSOPSProcessingMode
See Section Appendix A.
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6.6.1.3 GEPSIdConf
See Section Appendix A.
6.6.1.4 GccsConfAvhrrChannel
Bit Meaning
7 - 2 Unused
0 - 1 00 = AVHRR channels not available;
10 = AVHRR channels available;
01 = AVHRR channels transition between available and not available channels.
Synthesis of the AVHRR lines overlaying IIS image.
6.6.1.5 GQisFlagQualDetailed
See Section Appendix A.
6.6.1.6 GEUMAvhrr1BQual
See Section Appendix A.
6.6.1.7 GCcsAvhrrPseudoChn
The variable “GCcsAvhrrPseudoChn” contains the radiance values of four AVHRR pseudo-channels
(first dimension (DIM1)) for every pixel (DIM2) and step number (DIM3). The relationship between
the pseudo-channels and the array position of the first dimension is as follows:
GCcsAvhrrPseudoChn(0) is the AVHRR ch4 pseudo-channel radiance,
GCcsAvhrrPseudoChn(1) is the AVHRR ch5 pseudo-channel radiance,
GCcsAvhrrPseudoChn(2) is the IASI-based AVHRR ch4 pseudo-channel radiance,
GCcsAvhrrPseudoChn(3) is the IASI-based AVHRR ch5 pseudo-channel radiance.
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IASI Level 1 Product Format Specification
7 VERIFICATION RECORDS
7.1 Secondary Product Header Record
There is no SPHR defined for the IASI Level 1 products.
7.2 Global and Variable External Auxiliary Data Records
There are no GEADRs or VEADRs defined for the IASI Verification product.
7.3 Global and Variable Internal Auxiliary Data Records
There are no GIADRs or VIADRs in the IASI Verification product.
7.4 Measurement Data Records
There is one subclass of MDR for the Verification product, MDR-VERIFICATION. It contains
verification and auxiliary data in the order composed of concatenated IASI instrument source packets
(ISPs) in the following order: AP-VPA-VPB-VPC-VPD-VPE. These are pure ISPs without the header
added in the Level 0 MDR.
Subclass Name Description Subclass ID
MDR-VERIFICATION Verification and auxiliary data 4
The MDR is detailed in 0 of this document.
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IASI Level 1 Product Format Specification
RECORD SUBCLASSES
The tables below summarise the subclass name and ID information already provided in the preceding
chapters.
8.1 GIADR
Subclass Name
0 GIADR-QUALITY
1 GIADR-SCALE-FACTORS
2 GIADR-ENGINEERING
8.2 VIADR
Subclass Name
0 VIADR-ENGINEERING
8.3 MDR
Subclass Name
0 MDR-1A
1 MDR-1B
2 MDR-1C
3 MDR-ENGINEERING
4 MDR-VERIFICATION
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IASI Level 1 Product Format Specification
OCCURRENCE INFORMATION
9.1 Level 1a
Record
MPHR
SPHR
GIADRs
MDR-1A
9.2 Level 1b
Record
MPHR
SPHR
GIADRs
MDR-1B
9.3 Level 1c
Record
MPHR
SPHR
GIADRs
MDR-1C
9.4 Engineering
Record
MPHR
SPHR
GIADR-ENGINEERING
VIADR-ENGINEERING
MDR-ENGINEERING
9.5 Verification
Record
MPHR
SPHR
MDR-VERIFICATION
Occurrence
Once per product
Deleted
Once per product
Once per scan line
Occurrence
Once per product
Deleted
Once per product
Once per scan line
Occurrence
Once per product
Deleted
Once per product
Once per scan line
Occurrence
Once per product
Deleted
Once per product
Once every 10 scan lines
Once per scan line
Occurrence
Once per product
Deleted
Once per scan line
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IASI Level 1 Product Format Specification
10 RECORD FORMAT VERSION CONTROL
This section provides version numbers for the records defined within this document.
Record Subclass Format Version Number Issue Defined
DELETED 6.4
SPHR
1 6.3 (CDR)
2 6.4
GIADR-QUALITY
1 6.3 (CDR)
2 6.4
GIADR-SCALEFACTORS
1 6.3 (CDR)
MDR-1A
MDR-1B
MDR-1C
5 8
4 6.6
3 6.5
2 6.4
1 6.3 (CDR)
5 8
4 6.6
3 6.5
2 6.4
1 6.3 (CDR)
5 8
4 6.6
3 6.5
2 6.4
1 6.3 (CDR)
3 6.5
GIADR-ENGINEERING
2 6.4
1 6.3 (CDR)
3 6.6
VIADR-ENGINEERING
2 6.4
1 6.3 (CDR)
MDR-ENGINEERING
6 9
5 8
4 6.6
3 6.5
2 6.4
1 6.3 (CDR)
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IASI Level 1 Product Format Specification
Record Subclass Format Version Number Issue Defined
3 6.5
MDR-VERIFICATION
2 6.4
1 6.3 (CDR)
Table 2: Record Format Version Numbers
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IASI Level 1 Product Format Specification
APPENDIX A DETAILED SPECIFICATION OF IASI LEVEL 1
DATA RECORDS
In the following Annex, detailed format specifications for all the Variable Internal and Measurement
Data Records in IASI Level 1 products are included, i.e.:
GIADR-QUALITY
GIADR-SCALEFACTORS
MDR-1A
MDR-1B
MDR-1C
GIADR-ENGINEERING
VIADR-ENGINEERING
MDR-ENGINEERING
MDR-VERIFICATION
The Annex is available as a separate spreadsheet, with Document Reference:
EUM.EPS.SYS.SPE.990003.ANX .
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IASI_Level_1_Product_Format_Specification_-_Annex[1].xls
Worksheet: VERSION
This Document
Title
IASI LEVEL 1 PRODUCT FORMAT SPECIFICATION TABLES
Reference Numbe
r
EPS/MIS/SPE/990003
Change Record
Issue 4 Draft
A
A
dded Version Control Worksheet (LEO/C/TP)
Removed detailed navigation section from all VIADRs (LEO/C/TP)
Issue 4 Draft B
Updated layout to allow automatic calculation of sizes
Issue 4 Draft C
Removed VIADR and VEADR because there were no specified content
s
Moved MDR and ADR for Levels 1a,b and c onto separate worksheets for clarit
y
Updated contents in line with revised version of IASI-TN-2100-9469-CNE
Increased parameter NBK from 5 to 6
Increased parameter NCL from 6 to 7
A
dded temporary field names to those fields that were still named with a "?" after revised version updates.
Divided ADR field GEPSLocIasiAvhrr into two fields, GEPSLocIasiAvhrr_IASI and GEPSLocIasiAvhrr_IIS
MDR field GSmcSpect moved from byte*3 to byte type in line with GPFS. Extra array dimension added to compensate
A
DR verification Verification_Data field changed from integer8 to bytetype for flexibility - total size not changed
Issue 5 Revision 0
Issue for CGS PD
R
Issue 5 Revision 1
Revised Issue for CGS PDR
Corrected some formula errors that resulted in incorrect reocrd size calculation
s
Issue 6 Revision 0
Removed ADRS. ADR contents moved to relevant MDR.
Draft
A
Updated PFS in line with revised version of IASI Level1 Product Content version 5.2
Updated SPH
R
- Removed CDA Status
- Removed Processing Mode Status Change field
Reduced number of classes for FOV sounder analysis parameter (NCL) from 7 to
6
Introduced new notation - bitsr(64)[real*8] and bitst(32)[real*4] for the engineering product to show a bitst field that is used
to store a binary dump of an IEEE real type of 8 and 4 bytes, respectively.
2 of 6
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IASI_Level_1_Product_Format_Specification_-_Annex[1].xls
Worksheet: VERSION
Draft B
A
dded EARTH_SATELLITE_DISTANCE field to Level 1a/1b/1c MDRs as this info is availbale at Level 1a and is required
again at Level 2 processing
Issue 6 Revision 1
Introduced V-INTEGER types in line with Issue 6.1 of GPFS [AD-1]
Issue 6 Revision 2
Size of spectral data in all three MDRs reduced from 3*byte to integer2. This is posisble by using a number of scale
factors in a number of spectral bands
New GIADR-SCALEFACTORS added to include scaling factors for up to 10 spectral bands to accommodate scaling of
spectral data
Original GIADR renamed to GIADR-QUALITY to avoid confusion
Issue 6 Revision 3
Modifications to Word document
Issue 6 Rev
4
EUM.EPS.SYS.DCR.02.17
5
GIADR_QUALITY:
Deleted GEPSIdConf_produc
t
Updated IDefPsfSondY/Z fields - scale factors, units, array defintion and field type
Changed array ordering for IDefIISNeDT and IDefDptIISDeadPix
GIADR.SCALE_FACTORS:
Renamed NUMBER_OF_SPECTRAL_BANDS to IDefScaleSondNbScal
e
A
dded IDefScaleSondNsfirs
t
Renamed SPECTRAL_BAND_END_CHANNEL to IDefScaleSondNslas
t
Renamed SCALE_FACTORS to IDefScaleSondScaleFacto
r
A
dded IDefScaleIISScaleFactor
MDR-1A/1B/1C
Changed array size and field type for GEPSIdConf
GIsfLinOrigin and GIsfColOrigin units deleted
GIsfPds1-4 units removed, scale factor of 6 added
IDefSpecDWn, IDefNsfirst and IDefNslast moved to 1a/1b/1c specific areas in MDR and renamed for MDR-1b/1c
A
rray ordering of GIrcImage changed
MlscOffsetSondIIS deleted
A
dded field GQisFlagQual
GQisSysTecIISQual and GQisSysTecSondQual field types changed from V-integer4 to u-integer4
A
ngle fields and location fields chnaged from V-integer4 to u-integer4 and given scale factor of 6
GSmcSpect array order changed. Data type made unsigne
d
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Worksheet: VERSION
IDefCovarMatEigenVal1 name changed to IDefCovarMatEigenVal11b for MDR-1a/1b and to IDefCovarMatEigenVal11c
for MDR-1c.Description updated
MDR-1C:
IDefCcsChannelId array size increase
d
GCcsRadAnalWgt, GCcsRadAnalY, GCcsRadAnalZ array order change
d
GCcsRadAnalY, GCcsRadAnalZ data type changed to integer4. Units and scale factor adde
d
Image classification fields added at end of MDR
General: Cloud Analysis phrase replaced by more accurate Radiance Analysi
s
GIADR ENGINEERING:
GEPSDatProcessing array size reduce
d
GEPSIdConf_Product deleted
OBT to UTC fields added
VIADR-ENGINEERING
MDptIISBadHealthPix and MDptIISinHomPix arrays order changed
MDR ENGINEERING
Made changes requested by CNES (as detailed in DCR
)
MDR VERIFICATION
Made changes requested by CNES (as detailed in DCR
)
The following fields are defined to be in the order (zenith, azimuth) :
GGeoSondAnglesMETO
P
GGeoIISAnglesMETOP
GGeoSondAnglesSUN
GGeoIISAnglesSUN fields
A
dded Parameters AMCO, AMLI
Updated Parameter NCL from 6 to 7
Updated size clauclations and offset calculations
Issue 6 Rev 5 EUM.EPS.SYS.DCR.02.251
MDR 1C: Fields GCcsRadAnalY and GCcsRadAnalZ. Changed array size from [NCL,PN,SNOT,2] to [NCL,PN,SNOT,1]
and changed data types from V-INTEGER4 to integer4
MDR 1C : Fields GCcsImageClassifiedNbLin, GCcsImageClassifiedNbCol, GCcsImageClassifiedFirstLin and
GCcsImageClassifiedFirstCol changed array ordering from [1,1,SNOT,1] to [SNOT,1,1,1]
MDR-ENGINEERING changed field name CGeoSubSatellitePosition to GGeoSubSatellitePosition
MDR-ENGINEERING changed field name CGCcsRadAnalNbClass to GCcsRadAnalNbClass
4 of 6
Doc Ref: EUM.EPS.SYS.SPE.990003.ANX
IASI_Level_1_Product_Format_Specification_-_Annex[1].xls
Worksheet: VERSION
MDR-ENGINEERING. Corrected formula that calculates field sizes for all fields. Requires updated of Parameters
worksheet as well. This results in updated field sizes, offsets and record size for MDR-ENGINEERING.
A
dded DCR reference to this table for issue 6.
4
Issue 6 Rev 6 EUM.EPS.SYS.DCR.04.009
MDR-1a, 1b, 1c - Change GQisFlagQual from scalar to arrya of PN x SNOT
MDR-1A, 1b, 1c - Add clarification of ordering to flag GEPSLocIasiAvhrr_IASI
MDR-1a - Change data type of field GSmcSpect from unsigned integer2 to signed integer2
MDR-1b - Change data type of field GS1bSpect from unsigned integer2 to signed integer2
MDR-1c - Change data type of field GS1cSpect from unsigned integer2 to signed integer2
MDR-1c - Add units and update description for GCcsImageClassifiedFirstLi
n
MDR-1c - Add units and update description for GCcsImageClassifiedFirstCol
MDR-1c - Change datatype of field GCsImageClassified
MDR-Engineering - Correct calculation of field size for field MMcxNoiseCalRad
MDR-Engineering - Correct calculation of field size for field MMcxBiasCalRad
MDR-Engineering - Field GOPSFltIsrfemOff array size changed from PN x SNOT to PN
MDR-Engineering - Field GOPSFlagPacketIPMiss array size changed from SNOT to SNOT+4
MDR-Engineering - Added field GOPSFlaGeoAVHRRMiss
MDR-Engineering - Deleted field SPARE
MDR-Engineering - Added units for field GlacPosMaxQual
MDR-Engineering - add units to field GIacVarImagIIS
MDR-Engineering - change units for field GCOffsetSondAvhrr
MDR-Engineering - Add units to field GlaxAxeRes
MDR-Engineering - Add units to field GlFaxAxeRes
MDR-Engineering - Change units of field GIccRadCalOffsetImag
MDR-Engineering - Change datatype of field GIccRadCalOffsetImag
MDR-Engineering - Add units to field GlccRadCalSlopeImag
MDR-Engineering - Add ScaleFactor to field GlccRadCalSlopeImag
MDR-Verification - Added typical size for record and reference to Section 7.3 for order of contents
MDR-Verification - Change datatype for field VERIFICATION_DATA
VIADR-Engineering - Change datatype from byte to u-byet for fields MExsSmin, MExsSmax and MDptIISinHomPix
Parameters - Added N to provide typical MDR-Verification size
Parameters - Added description of SNOT+4 paramete
r
Issue 6 Rev 7 EUM.EPS.SYS.DCR.05.025
3
5 of 6
Doc Ref: EUM.EPS.SYS.SPE.990003.ANX
IASI_Level_1_Product_Format_Specification_-_Annex[1].xls
Worksheet: VERSION
See document table in main text - no changes to this Annex
Version 7A 23/07/08 Migrated into Hummingbird. Contents identical with issue 6.7.
Version 7B 23/07/08 No changes to annex.
Version 7C 22/08/08
EPS_AB_DCR_EUM_73
MDR-L1C - Change of units description of GCcsRadAnalMean
MDR-L1C - Change of units description of GCcsRadAnalStd
Version 8 14/10/08
EPS_AB_DCR_EUM_74
MDR-1a - change of dimension of GQisFlagQual
MDR-1a - Add field GQisFlagQualDetailed
MDR-1b - change of dimension of GQisFlagQual
MDR-1b - Add field GQisFlagQualDetailed
MDR-1c - change of dimension of GQisFlagQual
MDR-1c - Add field GQisFlagQualDetailed
MDR-1c - Add field GIacVarImagIIS
MDR-1c - Add field GIacAvgImagIIS
MDR-1c - Add field GEUMAvhrr1BCldFrac
MDR-1c - Add field GEUMAvhrr1BLandFrac
MDR-1c - Add field GEUMAvhrr1BQual
MDR-Engineering Add field GIacAvgImagIIS
MDR-Engineering Add field NZPDInterpixelEW
MDR-Engineering Add field NZPDInterpixelBB
MDR-Engineering Add field NZPDInterpixelCS
MDR-Engineering Add field GSsdConverFlag
MDR-Engineering Add field GQisFlagDetailed
MDR-Engineering Add field GEUMAvhrr1BCldFrac
MDR-Engineering Add field GEUMAvhrr1BLandFrac
MDR-Engineering Add field GEUMAvhrr1BQual
MDR-Engineering Add field GCcsAvhrrPseudoChn
MDR-Engineering Add field GCcsAvhrrPsCh4FlagQual
MDR-Engineering Add field GCcsAvhrrPsCh5FlagQual
MDR-Engineering change of DATA_PX (add BArcImagRMS form L0 word 32 to 149
)
6 of 6
Doc Ref: EUM.EPS.SYS.SPE.990003.ANX
IASI_Level_1_Product_Format_Specification_-_Annex[1].xls
Worksheet: VERSION
MDR-Engineering change of dimenson of GQisFlagQual
V
ersion 9 27/01/09 ODT_DCR_17
MDR-1a change content of GQisFlagQualDetailed
MDR-1b change content of GQisFlagQualDetailed
MDR-1c change content of GQisFlagQualDetailed
MDR-Engineering change content of field GQisFlagDetailed
MDR-Engineering remove GCcsAvhrrPSCh4FlagQual
MDR-Engineering remove GCcsAvhrrPSCh5FlagQual
MDR-Engineering remove NZPDInterPixelEW
MDR-Engineering remove NZPDInterPixelBB
MDR-Engineering remove NZPDInterPixelCS
MDR-Engineering add MHipNZpdInterPixel
MDR-Engineering add MHipFlagInterPixNZpdNonQual
MDR-Engineering split Data_IP into Data_IP (word 4 to 22) and
MDR-Engineering add EqualizationCounte
r
V
ersion 9A 25/02/09
Typo: References to "GQisFlagDetailed" above for Versions 8 & 9 should read "GQisFlagQualDetailed".
V
ersion 9B 13/10/10 ODT_DCR_155 & EUM/EPS/NCR/1230
3
See Document Change Record in main document - no changes to this Annex.
V
ersion 9C 07/12/10 GEUMAvhrr1BQual description update (in MDR-1C & MDR ENGINEERING).
[To stay as Draft update for now; no DCR produced yet.
]
V
ersion 9D 01/12/11 STM_DOCET_110
Unit correction for GEPSLocIASIAvhrr_Iasi & GEPSLocIASIAvhrr_IIS: from Avhrr pixel to ms (milliseconds) in MDR-1a,
1b and 1c.
Same thing for GCcsImageClassifiedFirstLin in the MDR-1c.
V
ersion 9E 14/12/11 STM_DOCET_110 revision
The above-mentioned unit correction for GEPSLocIASIAvhrr_Iasi & GEPSLocIASIAvhrr_IIS from Avhrr pixel to ms in
MDR-1a, 1b and 1c in fact applies for the line only. Column stays in Avhrr pixels.
1 of 1
Doc Ref: EUM.EPS.SYS.SPE.990003.ANX
IASI_Level_1_Product_Format_Specification_-_Annex[1].xls
Worksheet: GIADR-QUALITY
FIELD DESCRIPTION SF UNITS DIM1 DIM2 DIM3 TYPE TYPE
SIZE
FIELD
SIZE
OFFSET
RECORD_HEADER
Generic Record Header 0 1 1 1 REC_HEAD 20 20 0
QUALITY PARAMETERS 20
IDefPsfSondNbLin
Number of lines for sounder IPSF PN 1 1 integer4 4 16 20
IDefPsfSondNbCol
Number of columns for sounder IPSF PN 1 1 integer4 4 16 36
IDefPsfSondOverSampFactor
Oversampling factor for sounder IPSF 1 1 1 V-INTEGER4 5 5 52
IDefPsfSondY
Y position of sounder IPSF in the cold
plane
6 degrees 100 PN 1 integer4 4 1600 57
IDefPsfSondZ
Z position of sounder IPSF in the cold
plane
6 degrees 100 PN 1 integer4 4 1600 1657
IDefPsfSondWgt
IPSF weight 100 100 PN V-INTEGER4 5 200000 3257
IDefllSSrfNsfirst
Number of first sample in spectral imager
filter
1 1 1 integer4 4 4 203257
IDefllSSrfNslast
Number of last sample in spectral imager
filter
1 1 1 integer4 4 4 203261
IDefllSSrf
Spectral response of spectral imager
filter
100 1 1 V-INTEGER4 5 500 203265
IDefllSSrfDWn
Sample width of spectral imager filter m-1 1 1 1 V-INTEGER4 5 5 203765
IDefIISNeDT
IIS Noise K IMCO IMLI 1 V-INTEGER4 5 20480 203770
IDefDptIISDeadPix
Table of IASI imager dead pixels IMCO IMLI 1
boolean 1 4096 224250
TOTAL SIZE 228346
1 of 1
Doc Ref: EUM.EPS.SYS.SPE.990003.ANX
IASI_Level_1_Product_Format_Specification_-_Annex[1].xls
Worksheet: GIADR-SCALEFACTORS
FIELD DESCRIPTION SF UNITS DIM1 DIM2 DIM3 TYPE TYPE
SIZE
FIELD
SIZE
OFFSET
RECORD_HEADER
Generic Record Header 0 1 1 1 REC_HEAD 20 20 0
Scale Factors 20
IDefScaleSondNbScale
Number of bands used for applying scale
factors to spectra (up to a maximum of
10)
NA NA 1 1 1 integer2 2 2 20
IDefScaleSondNsfirst
Begin channel number for each of the
bands to which the scale factors are
applied
0 channel number 10 1 1 integer2 2 20 22
IDefScaleSondNslast
End channel number for each of the
bands to which the scale factors are
applied
0 channel number 10 1 1 integer2 2 20 42
IDefScaleSondScaleFactor
Scale factors (power of 10) to be applied
within each band defined above.
0 NA 10 1 1 integer2 2 20 62
IDefScaleIISScaleFactor
Scale factor (power of 10) to be applied
to the IIS imager.
0 NA 1 1 1 integer2 2 2 82
TOTAL SIZE 84
1 of 3
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IASI_Level_1_Product_Format_Specification_-_Annex[1].xls
Worksheet: MDR-1A
FIELD DESCRIPTION SF UNITS DIM1 DIM2 DIM3 DIM4 TYPE TYPE
SIZE
FIELD
SIZE
OFFSET
RECORD_HEADER
Generic Record Header 0 1 1 1 1 REC_HEAD 20 20 0
GENERIC QUALITY INDICATORS
20
DEGRADED_INST_MDR
Quality of MDR has been degraded
from nominal due to an instrument
degradation
1 1 1 1 boolean 1 1 20
DEGRADED_PROC_MDR
Quality of MDR has been degraded
from nominal due to a processing
degradation
1 1 1 1 boolean 1 1 21
Level 1 Data
22
GEPSIasiMode
Instrument mode 1 1 1 1 bitst(32) 4 4 22
GEPSOPSProcessingMode
Processing mode 1 1 1 1 bitst(32) 4 4 26
GEPSIdConf
System configuration at line level:
PTSI, TEC conf file ID,…..
1 1 1 1 bitst(256) 32 32 30
GEPSLocIasiAvhrr_IASI
Measure positioning relatively to
AVHRR: position of 4 IASI sounder
pixels in AVHRR raster with DIM1
equal to 2 corresponding to (line,
column)
ms in line, Avhrr
pixels in column
2 PN SNOT 1 V-INTEGER4 5 1200 62
GEPSLocIasiAvhrr_IIS
Measure positioning relatively to
AVHRR: position of IIS pixels for a
subgrid 5*5 of IIS with DIM1 equal to
2 corresponding to (line, column)
ms in line, Avhrr
pixels in column
2 SGI SNOT 1 V-INTEGER4 5 7500 1262
OBT
On Board Time (Coarse time + Fine
time)
SNOT 1 1 1 bitst(48) 6 180 8762
OnboardUTC
Date of IASI measure (on board
UTC): Number of Days since 1
January 2000; Number of ms in the
day
SNOT 1 1 1 short cds time 6 180 8942
GEPSDatIasi
Date of IASI measure (Corrected
UTC): Number of Days since 1
January 2000; Number of ms in the
day
UTC SNOT 1 1 1 short cds time 6 180 9122
GIsfLinOrigin
Zero point in line in the interpolation
grid of the spectral database
CCD
1 1 1 integer4 4 8 9302
GIsfColOrigin
Zero point in column in the
interpolation grid of the spectral
database
CCD 1 1 1 integer4 4 8 9310
2 of 3
Doc Ref: EUM.EPS.SYS.SPE.990003.ANX
IASI_Level_1_Product_Format_Specification_-_Annex[1].xls
Worksheet: MDR-1A
GIsfPds1
Weight of interpolation point 1 6 CCD 1 1 1 integer4 4 8 9318
GIsfPds2
Weight of interpolation point 2 6 CCD 1 1 1 integer4 4 8 9326
GIsfPds3
Weight of interpolation point 3 6 CCD 1 1 1 integer4 4 8 9334
GIsfPds4
Weight of interpolation point 4 6 CCD 1 1 1 integer4 4 8 9342
GEPS_CCD
Corner Cube Direction for all
observational targets
SNOT 1 1 1 boolean 1 30 9350
GEPS_SP
Scan position for all observational
targets
SNOT 1 1 1 integer4 4 120 9380
GIrcImage
Calibrated IASI images W/m2/sr/m-1 IMCO IMLI SNOT 1 u-integer2 2 245760 9500
GQisFlagQual
Quality flag for the system SB PN SNOT 1 boolean 1 360 255260
GQisFlagQualDetailed
Detailed quality flag for the system PN SNOT 1 1 bitst(16) 2 240 255620
GQisQualIndex
System-IASI general quality inde
x
1 1 1 1 V-INTEGER4 5 5 255860
GQisQualIndexIIS
IIS imager quality index inside 1c
[product
1 1 1 1 V-INTEGER4 5 5 255865
GQisQualIndexLoc
Geometric quality index for sounder
product
1 1 1 1 V-INTEGER4 5 5 255870
GQisQualIndexRad
Radiometric quality index for sounder
product
1 1 1 1 V-INTEGER4 5 5 255875
GQisQualIndexSpect
Spectral quality index for sounder
product
1 1 1 1 V-INTEGER4 5 5 255880
GQisSysTecIISQual
System -TEC quality index for IIS
1 1 1 1 u-integer4 4 4 255885
GQisSysTecSondQual
System -TEC quality index for
sounder
1 1 1 1 u-integer4 4 4 255889
GGeoSondLoc
Location of pixel centre in geodetic
coordinates (long, lat) for each
sounder pixel
6 degrees 2 PN SNOT 1 integer4 4 960 255893
GGeoSondAnglesMETOP
Measurement angles for each
sounder pixel (zenith, azimuth)
6 degrees 2 PN SNOT 1 integer4 4 960 256853
GGeoIISAnglesMETOP
Measurement angles for a subgrid of
IASI imager (zenith, azimuth)
6 degrees 2 SGI SNOT 1 integer4 4 6000 257813
GGeoSondAnglesSUN
Solar angles at the surface for each
sounder pixel (zenith, azimuth)
6 degrees 2 PN SNOT 1 integer4 4 960 263813
GGeoIISAnglesSUN
Solar angles at the surface for a
subgrid (5x5) of IASI imager (zenith,
azimuth)
6 degrees 2 SGI SNOT 1 integer4 4 6000 264773
GGeoIISLoc
Location of pixel centre in geodetic
coordinates for a sub grid (5x5) of
the imager pixels
6 degrees 2 SGI SNOT 1 integer4 4 6000 270773
3 of 3
Doc Ref: EUM.EPS.SYS.SPE.990003.ANX
IASI_Level_1_Product_Format_Specification_-_Annex[1].xls
Worksheet: MDR-1A
EARTH_SATELLITE_DISTANCE
Distance of satellite from Earth
centre
m 1 1 1 1 u-integer4 4 4 276773
Level 1a Specific Data
276777
IDefSpectrDWn
Sample width of IASI spectra
m-1 1 1 1 1 V-INTEGER4 5 5 276777
IDefNsfirst
Number of the first sample of IASI
spectra
1 1 1 1 integer4 4 4 276782
IDefNslast
Number of the last sample of IASI
spectra
1 1 1 1 integer4 4 4 276786
GSmcSpect
Level 1a spectra W/m2/sr/m-1 SS PN SNOT 1 integer2 2 2088000 276790
IDefCovarMatEigenVal1b
Level 1a noise variance-covariance
matrix index.
(IDefCovarMatEigenVal1b is the
same for Level 1a and 1b.)
CCD 100 1 1 V-INTEGER4 5 1000 2364790
TOTAL SIZE 2365790
1 of 3
Doc Ref: EUM.EPS.SYS.SPE.990003.ANX
IASI_Level_1_Product_Format_Specification_-_Annex[1].xls
Worksheet: MDR-1B
FIELD DESCRIPTION SF UNITS DIM1 DIM2 DIM3 DIM4 TYPE TYPE
SIZE
FIELD
SIZE
OFFSET
RECORD_HEADER
Generic Record Header 0 1 1 1 1 REC_HEAD 20 20 0
GENERIC QUALITY INDICATORS
20
DEGRADED_INST_MDR
Quality of MDR has been degraded
from nominal due to an instrument
degradation
1 1 1 1 boolean 1 1 20
DEGRADED_PROC_MDR
Quality of MDR has been degraded
from nominal due to a processing
degradation
1 1 1 1 boolean 1 1 21
Level 1 Data
22
GEPSIasiMode
Instrument mode 1 1 1 1 bitst(32) 4 4 22
GEPSOPSProcessingMode
Processing mode 1 1 1 1 bitst(32) 4 4 26
GEPSIdConf
System configuration at line level:
PTSI, TEC conf file ID,…..
1 1 1 1 bitst(256) 32 32 30
GEPSLocIasiAvhrr_IASI
Measure positioning relatively to
AVHRR: position of 4 IASI sounder
pixels in AVHRR raster with DIM1
equal to 2 corresponding to (line,
column)
ms in line, Avhrr
pixels in column
2 PN SNOT 1 V-INTEGER4 5 1200 62
GEPSLocIasiAvhrr_IIS
Measure positioning relatively to
AVHRR: position of IIS pixels for a
subgrid 5*5 of IIS with DIM1 equal to
2 corresponding to (line, column)
ms in line, Avhrr
pixels in column
2 SGI SNOT 1 V-INTEGER4 5 7500 1262
OBT
On Board Time (Coarse time + Fine
time)
SNOT 1 1 1 bitst(48) 6 180 8762
OnboardUTC
Date of IASI measure (on board
UTC): Number of Days since 1
January 2000; Number of ms in the
day
SNOT 1 1 1 short cds time 6 180 8942
GEPSDatIasi
Date of IASI measure (Corrected
UTC): Number of Days since 1
January 2000; Number of ms in the
day
UTC SNOT 1 1 1 short cds time 6 180 9122
GIsfLinOrigin
Zero point in line in the interpolation
grid of the spectral database
CCD
1 1 1 integer4 4 8 9302
2 of 3
Doc Ref: EUM.EPS.SYS.SPE.990003.ANX
IASI_Level_1_Product_Format_Specification_-_Annex[1].xls
Worksheet: MDR-1B
GIsfColOrigin
Zero point in column in the
interpolation grid of the spectral
database
CCD 1 1 1 integer4 4 8 9310
GIsfPds1
Weight of interpolation point 1 6 CCD 1 1 1 integer4 4 8 9318
GIsfPds2
Weight of interpolation point 2 6 CCD 1 1 1 integer4 4 8 9326
GIsfPds3
Weight of interpolation point 3 6 CCD 1 1 1 integer4 4 8 9334
GIsfPds4
Weight of interpolation point 4 6 CCD 1 1 1 integer4 4 8 9342
GEPS_CCD
Corner Cube Direction for all
observational targets
SNOT 1 1 1 boolean 1 30 9350
GEPS_SP
Scan position for all observational
targets
SNOT 1 1 1 integer4 4 120 9380
GIrcImage
Calibrated IASI images W/m2/sr/m-1 IMCO IMLI SNOT 1 u-integer2 2 245760 9500
GQisFlagQual
Quality flag for the system SB PN SNOT 1 boolean 1 360 255260
GQisFlagQualDetailed
Quality flag for the system PN SNOT 1 1 bitst(16) 2 240 255620
GQisQualIndex
System-IASI general quality inde
x
1 1 1 1 V-INTEGER4 5 5 255860
GQisQualIndexIIS
IIS imager quality index inside 1c
[product
1 1 1 1 V-INTEGER4 5 5 255865
GQisQualIndexLoc
Geometric quality index for sounder
product
1 1 1 1 V-INTEGER4 5 5 255870
GQisQualIndexRad
Radiometric quality index for sounder
product
1 1 1 1 V-INTEGER4 5 5 255875
GQisQualIndexSpect
Spectral quality index for sounder
product
1 1 1 1 V-INTEGER4 5 5 255880
GQisSysTecIISQual
System -TEC quality index for IIS
1 1 1 1 u-integer4 4 4 255885
GQisSysTecSondQual
System -TEC quality index for
sounder
1 1 1 1 u-integer4 4 4 255889
GGeoSondLoc
Location of pixel centre in geodetic
coordinates (long, lat) for each
sounder pixel
6 degrees 2 PN SNOT 1 integer4 4 960 255893
GGeoSondAnglesMETOP
Measurement angles for each
sounder pixel (zenith, azimuth)
6 degrees 2 PN SNOT 1 integer4 4 960 256853
GGeoIISAnglesMETOP
Measurement angles for a subgrid of
IASI imager (zenith, azimuth)
6 degrees 2 SGI SNOT 1 integer4 4 6000 257813
GGeoSondAnglesSUN
Solar angles at the surface for each
sounder pixel (zenith, azimuth)
6 degrees 2 PN SNOT 1 integer4 4 960 263813
GGeoIISAnglesSUN
Solar angles at the surface for a
subgrid (5x5) of IASI imager (zenith,
azimuth)
6 degrees 2 SGI SNOT 1 integer4 4 6000 264773
3 of 3
Doc Ref: EUM.EPS.SYS.SPE.990003.ANX
IASI_Level_1_Product_Format_Specification_-_Annex[1].xls
Worksheet: MDR-1B
GGeoIISLoc
Location of pixel centre in geodetic
coordinates for a sub grid (5x5) of
the imager pixels
6 degrees 2 SGI SNOT 1 integer4 4 6000 270773
EARTH_SATELLITE_DISTANCE
Distance of satellite from Earth
centre
m 1 1 1 1 u-integer4 4 4 276773
Level 1b Specific Data
276777
IDefSpectDWn1b
Sample width of IASI 1B spectra
m-1 1 1 1 1 V-INTEGER4 5 5 276777
IDefNsfirst1b
Number of the first sample of IASI
1B spectra
1 1 1 1 integer4 4 4 276782
IDefNslast1b
Number of the last sample of IASI 1B
spectra
1 1 1 1 integer4 4 4 276786
GS1bSpect
Level 1B spectra W/m2/sr/m-1 SS PN SNOT 1 integer2 2 2088000 276790
IDefCovarMatEigenVal1b
Level 1b noise variance-covariance
matrix index
(IDefCovarMatEigenVal1b is the
same for Level 1a and 1b.)
CCD 100 1 1 V-INTEGER4 5 1000 2364790
TOTAL SIZE 2365790
1 of 4
Doc Ref: EUM.EPS.SYS.SPE.990003.ANX
IASI_Level_1_Product_Format_Specification_-_Annex[1].xls
Worksheet: MDR-1C
FIELD DESCRIPTION SF UNITS DIM1 DIM2 DIM3 DIM4 TYPE TYPE
SIZE
FIELD
SIZE
OFFSET
RECORD_HEADER
Generic Record Header 0 1 1 1 1 REC_HEAD 20 20 0
GENERIC QUALITY INDICATORS
20
DEGRADED_INST_MDR
Quality of MDR has been degraded
from nominal due to an instrument
degradation
1 1 1 1 boolean 1 1 20
DEGRADED_PROC_MDR
Quality of MDR has been degraded
from nominal due to a processing
degradation
1 1 1 1 boolean 1 1 21
Level 1 Data
22
GEPSIasiMode
Instrument mode 1 1 1 1 bitst(32) 4 4 22
GEPSOPSProcessingMode
Processing mode 1 1 1 1 bitst(32) 4 4 26
GEPSIdConf
System configuration at line level:
PTSI, TEC conf file ID,…..
1 1 1 1 bitst(256) 32 32 30
GEPSLocIasiAvhrr_IASI
Measure positioning relatively to
AVHRR: position of 4 IASI sounder
pixels in AVHRR raster with DIM1
equal to 2 corresponding to (line,
column)
ms in line, Avhrr
pixels in column
2 PN SNOT 1 V-INTEGER4 5 1200 62
GEPSLocIasiAvhrr_IIS
Measure positioning relatively to
AVHRR: position of IIS pixels for a
subgrid 5*5 of IIS with DIM1 equal to
2 corresponding to (line, column)
ms in line, Avhrr
pixels in column
2 SGI SNOT 1 V-INTEGER4 5 7500 1262
OBT
On Board Time (Coarse time + Fine
time)
SNOT 1 1 1 bitst(48) 6 180 8762
OnboardUTC
Date of IASI measure (on board
UTC): Number of Days since 1
January 2000; Number of ms in the
day
SNOT 1 1 1 short cds time 6 180 8942
GEPSDatIasi
Date of IASI measure (Corrected
UTC): Number of Days since 1
January 2000; Number of ms in the
day
UTC SNOT 1 1 1 short cds time 6 180 9122
GIsfLinOrigin
Zero point in line in the interpolation
grid of the spectral database
CCD
1 1 1 integer4 4 8 9302
2 of 4
Doc Ref: EUM.EPS.SYS.SPE.990003.ANX
IASI_Level_1_Product_Format_Specification_-_Annex[1].xls
Worksheet: MDR-1C
GIsfColOrigin
Zero point in column in the
interpolation grid of the spectral
database
CCD 1 1 1 integer4 4 8 9310
GIsfPds1
Weight of interpolation point 1 6 CCD 1 1 1 integer4 4 8 9318
GIsfPds2
Weight of interpolation point 2 6 CCD 1 1 1 integer4 4 8 9326
GIsfPds3
Weight of interpolation point 3 6 CCD 1 1 1 integer4 4 8 9334
GIsfPds4
Weight of interpolation point 4 6 CCD 1 1 1 integer4 4 8 9342
GEPS_CCD
Corner Cube Direction for all
observational targets
SNOT 1 1 1 boolean 1 30 9350
GEPS_SP
Scan position for all observational
targets
SNOT 1 1 1 integer4 4 120 9380
GIrcImage
Calibrated IASI images W/m2/sr/m-1 IMCO IMLI SNOT 1 u-integer2 2 245760 9500
GQisFlagQual
Quality flag for the system SB PN SNOT 1 boolean 1 360 255260
GQisFlagQualDetailed
Quality flag for the system PN SNOT 1 1 bitst(16) 2 240 255620
GQisQualIndex
System-IASI general quality inde
x
1 1 1 1 V-INTEGER4 5 5 255860
GQisQualIndexIIS
IIS imager quality index inside 1c
[product
1 1 1 1 V-INTEGER4 5 5 255865
GQisQualIndexLoc
Geometric quality index for sounder
product
1 1 1 1 V-INTEGER4 5 5 255870
GQisQualIndexRad
Radiometric quality index for sounder
product
1 1 1 1 V-INTEGER4 5 5 255875
GQisQualIndexSpect
Spectral quality index for sounder
product
1 1 1 1 V-INTEGER4 5 5 255880
GQisSysTecIISQual
System -TEC quality index for IIS
1 1 1 1 u-integer4 4 4 255885
GQisSysTecSondQual
System -TEC quality index for
sounder
1 1 1 1 u-integer4 4 4 255889
GGeoSondLoc
Location of pixel centre in geodetic
coordinates (long, lat) for each
sounder pixel
6 degrees 2 PN SNOT 1 integer4 4 960 255893
GGeoSondAnglesMETOP
Measurement angles for each
sounder pixel (zenith, azimuth)
6 degrees 2 PN SNOT 1 integer4 4 960 256853
GGeoIISAnglesMETOP
Measurement angles for a subgrid of
IASI imager (zenith, azimuth)
6 degrees 2 SGI SNOT 1 integer4 4 6000 257813
GGeoSondAnglesSUN
Solar angles at the surface for each
sounder pixel (zenith, azimuth)
6 degrees 2 PN SNOT 1 integer4 4 960 263813
GGeoIISAnglesSUN
Solar angles at the surface for a
subgrid (5x5) of IASI imager (zenith,
azimuth)
6 degrees 2 SGI SNOT 1 integer4 4 6000 264773
3 of 4
Doc Ref: EUM.EPS.SYS.SPE.990003.ANX
IASI_Level_1_Product_Format_Specification_-_Annex[1].xls
Worksheet: MDR-1C
GGeoIISLoc
Location of pixel centre in geodetic
coordinates for a sub grid (5x5) of
the imager pixels
6 degrees 2 SGI SNOT 1 integer4 4 6000 270773
EARTH_SATELLITE_DISTANCE
Distance of satellite from Earth
centre
m 1 1 1 1 u-integer4 4 4 276773
Level 1c Specific Data
276777
IDefSpectDWn1b
Sample width of IASI 1C spectra
(same as 1B)
m-1 1 1 1 1 V-INTEGER4 5 5 276777
IDefNsfirst1b
Number of the first sample of IASI
1C spectra (same as 1B)
1 1 1 1 integer4 4 4 276782
IDefNslast1b
Number of the last sample of IASI 1C
spectra (same as 1B)
1 1 1 1 integer4 4 4 276786
GS1cSpect
Level 1C spectra W/m2/sr/m-1 SS PN SNOT 1 integer2 2 2088000 276790
IDefCovarMatEigenVal1c
Level 1c noise variance-covariance
matrix index
CCD 100 1 1 V-INTEGER4 5 1000 2364790
IDefCcsChannelId
Radiance Analysis: Identification of
the AVHRR channel or pseudo-
channels used for Radiance Analysis
NBK 1 1 1 integer4 4 24 2365790
GCcsRadAnalNbClass
Radiance Analysis: Number of
identified classes in the sounder
FOV
PN SNOT 1 1 integer4 4 480 2365814
GCcsRadAnalWgt
Radiance Analysis: sounder FOV
Radiance Analysis (% covered by
each class)
NCL PN SNOT 1 V-INTEGER4 5 4200 2366294
GCcsRadAnalY
Radiance Analysis: Y Angular
position of the centre of gravity
6 degrees NCL PN SNOT 1 integer4 4 3360 2370494
GCcsRadAnalZ
Radiance Analysis: Z Angular
position of the centre of gravity
6 degrees NCL PN SNOT 1 integer4 4 3360 2373854
GCcsRadAnalMean
Radiance Analysis: Mean AVHRR
radiances (all channels) of the
sounder FOV classes
W/(m^2 * sr) for
channel 1,2,3a
and
W/(m^2*sr*m^-
1) for 3b,4,5
NBK NCL PN SNOT V-INTEGER4 5 25200 2377214
GCcsRadAnalStd
Radiance Analysis: Standard
deviation AVHRR radiances (all
channels) of the sounder FOV
classes
W/(m^2 * sr) for
channel 1,2,3a
and
W/(m^2*sr*m^-
1) for 3b,4,5
NBK NCL PN SNOT V-INTEGER4 5 25200 2402414
4 of 4
Doc Ref: EUM.EPS.SYS.SPE.990003.ANX
IASI_Level_1_Product_Format_Specification_-_Annex[1].xls
Worksheet: MDR-1C
GCcsImageClassified
Radiance Analysis: Image AVHRR or
IIS classified
AMCO AMLI SNOT 1 u-byte 1 300000 2427614
IDefCcsMode
Radiance Analysis: Image used is
from AVHRR or IIS imager
(degraded cases)
1 1 1 1 bitst(32) 4 4 2727614
GCcsImageClassifiedNbLin
Radiance Analysis: Number of
usefull lines
SNOT 1 1 1 integer2 2 60 2727618
GCcsImageClassifiedNbCol
Radiance Analysis: Number of
usefull columns
SNOT 1 1 1 integer2 2 60 2727678
GCcsImageClassifiedFirstLin
First line of the classified image
(number in the Avhrr raster, as per
section 2.5 )
ms SNOT 1 1 1 V-INTEGER4 5 150 2727738
GCcsImageClassifiedFirstCol
First column of the classified image
(number in the Avhrr raster, as per
section 2.5 )
Avhrr pixels SNOT 1 1 1 V-INTEGER4 5 150 2727888
GCcsRadAnalType
Radiance Analysis: boolean reporting
if classes are of extreme type
NCL SNOT 1 1 boolean 1 210 2728038
GIacVarImagIIS
Variance of IIS image W/(m² sr m^-1) SNOT 1 1 1 V-INTEGER4 5 150 2728248
GIacAvgImagIIS
Average of IIS image W/(m² sr m^-1) SNOT 1 1 1 V-INTEGER4 5 150 2728398
GEUMAvhrr1BCldFrac
Cloud fraction in IASI FOV from
AVHRR 1B in IASI FOV
% PN SNOT 1 1 u-byte 1 120 2728548
GEUMAvhrr1BLandFrac
Land and Coast fraction in IASI FOV
from AVHRR 1B
% PN SNOT 1 1 u-byte 1 120 2728668
GEUMAvhrr1BQual
Quality indicator. If the quality is
good, it gives the coverage of
snow/ice.
PN SNOT 1 1 bitst(8) 1 120 2728788
TOTAL SIZE 2728908
1 of 1
Doc Ref: EUM.EPS.SYS.SPE.990003.ANX
IASI_Level_1_Product_Format_Specification_-_Annex[1].xls
Worksheet: GIADR ENGINEERING
FIELD DESCRIPTION SF UNITS DIM1 DIM2 DIM3 TYPE TYPE SIZE FIELD SIZE OFFSET
RECORD_HEADER Generic Record Header 0 1 1 1 REC_HEAD 20 20 0
QUALITY PARAMETERS 20
GEPSDatProcessing Date of ground processing - number of
day since 1 Juanary 2000 - number of
ms in the day
0 1 1 1 short cds time 6 6 20
GEPSUtcLeapSecond Parameter of OBT to UTC conversion;
3 integers (day, ms,s) = CCSDS
format, day:ms:s
0 3 1 1 integer4 4 12 26
GEPSCcuObtCorrel Parameter of OBT to UTC conversion;
an integer number of 1/256th of second
0 1 1 1 integer4 4 4 38
GEPSUtcCorrel Parameter of OBT to UTC conversion;
3 integers (day, ms,s) = CCSDS
format, day:ms:s
0 3 1 1 integer4 4 12 42
GEPSAStepCorrel Parameter of OBT to UTC conversion;
duration of 1 OBT tick (in micro-
second)
0 1 1 1 bitst(64)[real*8] 8 8 54
GEPSBStepCorrel Parameter of OBT to UTC conversion;
in micro-second
0 1 1 1 bitst(64)[real*8] 8 8 62
TOTAL SIZE 70
1 of 1
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Worksheet: VIADR-ENGINEERING
FIELD DESCRIPTION SF UNITS DIM1 DIM2 DIM3 TYPE TYPE SIZE FIELD SIZE OFFSET
RECORD_HEADER Generic Record Header 0 1 1 1 REC_HEAD 20 20 0
QUALITY PARAMETERS 20
MExsSmin Minimum pf Earth view spectra K 550 1 1 u-byte 1 550 20
MESsSmax Maximum of Earth view Spectra K 550 1 1 u-byte 1 550 570
MDptIISBadHealthPix Bad health image pixels table N/A IMCO IMLI 1 boolean 1 4096 1120
MDptIISinHomPix Table of inhomogeneity counter per
pixel
N/A IMCO IMLI 1 u-byte 1 4096 5216
TOTAL SIZE 9312
1 of 5
Doc Ref: EUM.EPS.SYS.SPE.990003.ANX
IASI_Level_1_Product_Format_Specification_-_Annex[1].xls
Worksheet: MDR ENGINEERING
FIELD DESCRIPTION SF UNITS DIM1 DIM2 DIM3 DIM4 TYPE TYPE
SIZE
FIELD SIZE OFFSET
RECORD_HEADER Generic Record Header 0 1 1 1 1 REC_HEAD 20 20 0
ASSOCIATED DATA 20
BIMSBBT Black Body temperature K 1 1 1 1 bitst(64)[real*8] 8 8 20
GFtbFilteredBBT Filtered Black Body temperature K 1 1 1 1 bitst(64)[real*8] 8 8 28
GEPSIdConf_Line System Configuration: PTSI, TEC conf file
ID, …
1 1 1 1 bitst(256) 32 32 36
GEPSIasiMode Instrument mode 1 1 1 1 bitst(32) 4 4 68
GCcsConfAvhrrChannel Avhrr channel configuration NBK SNOT 1 1 bitst(32) 4 720 72
GEPSGranulNumber Granule Number 1 1 1 1 integer4 4 4 792
GEPSDatlasi Date of IASI measure (corrected UTC) -
number od days since 1 January 2000 -
number of ms in the day (TBC)
SNOT 1 1 1 short cds time 6 180 796
GEPSOPSProcessingMod
e
Processing mode 1 1 1 1 bitst(32) 4 4 976
GEPS_SP Scan position for all observational targets SNOT 1 1 1 integer4 4 120 980
GEPS_CCD Corner cube direction for all observational
targets
SNOT 1 1 1 boolean 1 30 1100
GGeoSubSatellitePosition
Geodetic position of the centre of IIS at
image number 15 ( approximation of
subsatellite position)
degrees 2 1 1 1 bitst(64)[real*8] 8 16 1130
GEPSOPSFlagNan
This flag is raised when a Nan error has
occured during the processing
1 1 1 1 boolean 1 1 1146
GEPSEndEclipseTime
Date of the end of the previous satellite
eclipse
UTC 1 1 1 1 short cds time 6 6 1147
GSmeTScan Estimated temperature of the scanning miror K 1 1 1 1 bitst(64)[real*8] 8 8 1153
GSmeFlagDateNOK
Flag for inconsistency between current date
and ascending node
1 1 1 1 boolean 1 1 1161
GFtbBBTRes
Quality index for the filtering of the black-
body temperature
1 1 1 1 bitst(64)[real*8] 8 8 1162
GFtbFlagBBTNonQual
Quality flag of the black-body temperature 1 1 1 1 boolean 1 1 1170
GEPS_LN
Number of the IASI line since the bneginnin
g
of the dump
1 1 1 1 integer4 4 4 1171
GDocFlagUnderOverFlow Indicates that there is an under or an over-
flow
PN SNOT 1 1 boolean 1 120 1175
GDocNbUnderFlow Number of underflow occurred during
spectra decoding
PN SNOT 1 1 integer4 4 480 1295
2 of 5
Doc Ref: EUM.EPS.SYS.SPE.990003.ANX
IASI_Level_1_Product_Format_Specification_-_Annex[1].xls
Worksheet: MDR ENGINEERING
GDocNbOverFlow Number of overflow occurred during spectre
decoding
PN SNOT 1 1 integer4 4 480 1775
GDocPosUnderFlow Buffer of 3 positions of underflow occurred
during spectra decoding
3 PN SNOT 1 integer4 4 1440 2255
GDocPosOverFlow Buffer of 3 positions of overflow occurred
during spectre decoding
3 PN SNOT 1 integer4 4 1440 3695
BCodSpecVerlf
Full bit stream of IASI coded level 0 data (I;
e
full spectra) data corresponding to VDS
(verification data selection)
W/m2/sr/m-1 4320 1 1 1 integer2 2 8640 5135
GlacOffsetIISAvhrr IASI imager AVHRR imager coregistration
offset
AVHRR pixels 2 SNOT 1 1 bitst(64)[real*8] 8 480 13775
GlacCorrelQual Correlation quality index SNOT 1 1 1 bitst(64)[real*8] 8 240 14255
GlacPosMaxQual Quality index of maximum correlation
position
AVHRR pixels SNOT 1 1 1 bitst(64)[real*8] 8 240 14495
GlacFlagCoregNonValid Flag for imagers IASI/AVHRR non
coregistration
SNOT 1 1 1 boolean 1 30 14735
GlacFlagCoregNonQual Flag for imagers IASI/AVHRR non
coregistration
SNOT 1 1 1 boolean 1 30 14765
GIacVarImagIIS Variance of IIS image W/m^2/sr/m^-1 SNOT 1 1 1 bitst(64)[real*8] 8 240 14795
GIacAvgImagIIS Average of IIS image W/m^2/sr/m^-1 SNOT 1 1 1 bitst(64)[real*8] 8 240 15035
GEUMAvhrr1BCldFrac Cloud fraction in IASI FOV from AVHRR 1B
in IASI FOV
% PN SNOT 1 1 u-byte 1 120 15275
GEUMAvhrr1BLandFrac Land and Coast fraction in IASI FOV from
AVHRR 1B
% PN SNOT 1 1 u-byte 1 120 15395
GEUMAvhrr1BQual Quality indicator. If the quality is good, it
gives the coverage of snow/ice.
PN SNOT 1 1 bitst(8) 1 120 15515
GCcsOffsetSondAvhrr IASI sounder/AVHRR coregistration offset degrees 2 PN SNOT 1 bitst(64)[real*8] 8 1920 15635
GCcsOffsetSondIIS IASI sounder/imager coregistration offset degrees 2 PN SNOT 1 bitst(64)[real*8]
8 1920 17555
GQisCcsQualIndex FOV sounder radiances analysis quality
index
SNOT 1 1 1 bitst(64)[real*8] 8 240 19475
GCcsFlagDateNOK
Flag for inconsistency between current date
and ascending node
1 1 1 1 boolean 1 1 19715
GCcsAvhrrPseudoChn
Radiance from AVHRR pseudo ch 4 and 5
and IASI based AVHRR pseudo ch 4 and 5
W/m2/sr/m-1 4 PN SNOT 1 bitst(32)[real*4] 4 1920 19716
3 of 5
Doc Ref: EUM.EPS.SYS.SPE.990003.ANX
IASI_Level_1_Product_Format_Specification_-_Annex[1].xls
Worksheet: MDR ENGINEERING
GCcsRadAnalNbClass
Number of clases in the sounder FOV PN SNOT 1 1 integer4 4 480 21636
GCcsFlagPostProcessin
g
Post-processing flag SNOT 1 1 1 integer4 4 120 22116
GCcsNonClassifRat
e
Rate of unclassified points SNOT 1 1 1 bitst(64)[real*8] 8 240 22236
GCcsVarianceRate
Standard deviation (1) of the classified
image
SNOT 1 1 1 bitst(64)[real*8] 8 240 22476
GSsdConverFlag
Flag for the convergence of the spectral shi
f
algorithm
PN SNOT 1 1 boolean 1 120 22716
GSsdWnShift
Spectral shift calculated for the spectral
window
m-1 PN SNOT 1 1 bitst(64)[real*8] 8 960 22836
GSsdWnShiftQual
Quality index of calculated spectral shift
PN SNOT 1 1 bitst(64)[real*8] 8 960 23796
GSsdFlagSpectralShiftNonQual
Quality flag of spectral shift determination
PN SNOT 1 1 boolean 1 120 24756
GSssWnShiftMean
Mean spectral shift for 1 pixel during 1 IASI
line
m-1 PN CCD 1 1 bitst(64)[real*8] 8 64 24876
GSssWnShiftMeanQual
Quality index of mean spectral shift for each
PN and CCD
PN CCD 1 1 bitst(64)[real*8] 8 64 24940
GSssFlagNonSelPix Flag for pixel not selected PN CCD 1 1 boolean 1 8 25004
GSssFlagDateNOK
Flag for inconsistency between current date
and ascending node
1 1 1 1 boolean 1 1 25012
GlaxAxeY Y coordinates of interferometric axis degrees CCD 1 1 1 bitst(64)[real*8] 8 16 25013
GlaxAxeZ Z coordinates of interferometric axis degrees CCD 1 1 1 bitst(64)[real*8] 8 16 25029
GlaxFlagAxeNonQual Interferometric axis determination quality flag CCD 1 1 1 boolean 1 2 25045
GlaxAxeQual Interferometric axis position quality flag CCD 1 1 1 bitst(64)[real*8] 8 16 25047
GlaxAxeRes Verisimilitude index of the measure/model
shift
degrees CCD 1 1 1 bitst(64)[real*8] 8 16 25063
GFaxAxeY
Y filtered coordinates of interferometric axis degrees CCD 1 1 1 bitst(64)[real*8] 8 16 25079
GFaxAxeZ Z filtered coordinates of interferometric axis degrees CCD 1 1 1 bitst(64)[real*8] 8 16 25095
GFaxFlagAxeNonQual Interferometric axis filtered position quality
flag
CCD 1 1 1 boolean 1 2 25111
GFaxAxeRes Filtering quality index degrees CCD 1 1 1 bitst(64)[real*8] 8 16 25113
GIsfFlagPdsNonValid Interpolation weight validity flag CCD 1 1 1 boolean 1 2 25129
GIccRadCalOffsetImag Offset coefficient of image radiometric
calibration
counts IMCO IMLI 1 1 integer2 2 8192 25131
GlccRadCalSlopeImag Slope coefficient of image radiometric
calibration
14 W/m^2/sr/m^-
1/count
IMCO IMLI 1 1 integer4 4 16384 33323
4 of 5
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IASI_Level_1_Product_Format_Specification_-_Annex[1].xls
Worksheet: MDR ENGINEERING
GlccFlagInit
Indicator of the initiaisation of the radiometri
c
calibration
1 1 1 1 boolean 1 1 49707
GQisFlagQua
l
Quality flag for the system SB PN SNOT 1 boolean 1 360 49708
GQisFlagQualDetaile
d
Detailed Quality flag for the system PN SNOT 1 1 bitst(16) 2 240 50068
GQisQualInde
x
Quality index for the sounder products PN SNOT 1 1 bitst(64)[real*8] 8 960 50308
GQisQualIndexIIS
Quality index for the IIS imager products SNOT 1 1 1 bitst(64)[real*8] 8 240 51268
GQisQualIndexLoc
Geometric Quality index for the sounder
products
PN SNOT 1 1 bitst(64)[real*8] 8 960 51508
GQisQualIndexRad
Radiometric Quality index for the sounder
products
PN SNOT 1 1 bitst(64)[real*8] 8 960 52468
GQisQualIndexSpect
Spectral Quality index for the sounder
products
PN SNOT 1 1 bitst(64)[real*8] 8 960 53428
MHipNZpdInterPixel
NZPD position differences PN SNOT+4 1 1 integer2 2 272 54388
MHipFlagInterPixNzpdNonQual
NZPD position differences quality flag PN SNOT+4 1 1 integer2 2 272 54660
MMcxNoiseCalRad Noise of complex radiometric calibration K NIM PN SNOT 1 bitst(32)[real*4] 4 13440 54932
MMcxBiasCalRad Bias of complex radiometric calibration K NIM PN SNOT 1 bitst(32)[real*4] 4 13440 68372
MMcxFlagNoiseCalRad Flag for radiometric calibration noise
threshold crossing
PN SNOT 1 1 boolean 1 120 81812
MMcxFlagBlasCalRad Flag for radiometric calibration bias
threshold crossing
PN SNOT 1 1 boolean 1 120 81932
MMcxCoeffCalRad Error coefficient for radiometric calibration SB PN SNOT 1 bitst(64)[real*8] 8 2880 82052
MDptVarImagMax
Maximum value of the pseudo-variance in
the IIS image
1 1 1 1 bitst(64)[real*8] 8 8 84932
MDptVarImagMean
Mean value of the pseudo-variance in the IIS
image
1
1 1 1 bitst(64)[real*8] 8 8 84940
MDptPixQua
l
Qulaity Index for the imager 1 1 1 1 bitst(64)[real*8] 8 8 84948
GHecFlagDateNOK
Flag for inconsistency between current date
and ascending node
1 1 1 1 boolean 1 1 84956
Data_P
X
Words 4 to 151 of PX packet PN SNOT 148 1 integer2 2 35520 84957
Data_I
P
Words 4 to 22 PN SNOT+4 19 1 integer2 2 5168 120477
EqualizationCounte
r
32 bits for the equailization counter PN SNOT+4 2 1 integer2 2 544 125645
GOPSFlaPixMiss Flag for degraded mode: sounder-pixel is
temporarily missing
PN SNOT 1 1 boolean 1 120 126189
GOPSFlaDataGa
p
Flag for degraded mode: spectral gap 1 1 1 1 boolean 1 1 126309
GOPSFltIsrfemOff
Flag for degraded mode: ISRFEM chain not
activated for this SN number
SNOT 1 1 1 boolean 1 30 126310
5 of 5
Doc Ref: EUM.EPS.SYS.SPE.990003.ANX
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Worksheet: MDR ENGINEERING
GOPSDatIsrfemOff
Apparation date of ISrfemOff degraded case 1 1 1 1 short cds time 6 6 126340
GOPSFItBandMiss Flag for degraded mode: spectral band is
temporarily missing
SNOT 1 1 1 boolean 1 30 126346
GOPSDatBandMiss Apparation date of BandMiss degraded case 1 1 1 1 short cds time 6 6 126376
GOPSFltBBTMiss
Flag for degraded mode:black body
temperature is temporarily missing
1 1 1 1 boolean 1 1 126382
GOPSDatBBTMiss
Apparation date of BBTMiss degraded case 1 1 1 1 short cds time 6 6 126383
GOPSFltImgEWMiss
Flag for degraded mode:one operational
image is temporarily missing
SNOT 1 1 1 boolean 1 30 126389
GOPSDatImgEWMiss
Apparation date of ImgEWMiss degraded
case
1 1 1 1 short cds time 6 6 126419
GOPSFltImgBBMiss
Flag for degraded mode:one black body
image is temporarily missing
1 1 1 1 boolean 1 1 126425
GOPSDatImgBBMiss
Apparation date of ImgBBMiss degraded
case
1 1 1 1 short cds time 6 6 126426
GOPSFltImgCSMiss
Flag for degraded mode:one cold space
image is temporarily missing
1 1 1 1 boolean 1 1 126432
GOPSDatImgCSMiss
Apparation date of ImgCSMiss degraded
case
1 1 1 1 short cds time 6 6 126433
GOPSFlaIISCalibMiss
Flags of availability of the 4 calibration
images (32, 33, 35 and 36)
4 1 1 1 boolean 1 4 126439
GOPSFltRadAvhrrMiss
Flag for degraded mode:AVHRR radiances
are temporarily missing
SNOT 1 1 1 boolean 1 30 126443
GOPSDatRadAvhrrMiss
Apparation date of RadAvhrrMiss degraded
case
1
1 1 1 short cds time 6 6 126473
GOPSFlagPacketVPMiss
Flag for degraded mode:one VP instrumnet
packet is missing
5 1 1 1 boolean 1 5 126479
GOPSFlagPacketAPMiss
Flag for degraded mode:one AP instrumnet
packet is missing
1 1 1 1 boolean 1 1 126484
GOPSFlagPacketPXMiss
Flag for degraded mode:one PX instrumnet
packet is missing
PN SNOT 1 1 boolean 1 120 126485
GOPSFlagPacketIPMiss
Flag for degraded mode:one IP instrumnet
packet is missing
SNOT+4 1 1 1 boolean 1 34 126605
GOPSFlaGeoAvhrrMiss Flag for degraded case of AVHRR
geolocalisation data
SNOT 1 1 1 boolean 1 30 126639
TOTAL SIZE 126669
1 of 1
Doc Ref: EUM.EPS.SYS.SPE.990003.ANX
IASI_Level_1_Product_Format_Specification_-_Annex[1].xls
Worksheet: MDR VERIFICATION
FIELD DESCRIPTION SF UNITS DIM1 DIM2 DIM3 TYPE TYPE SIZE FIELD SIZE OFFSET
RECORD_HEADER Generic Record Header 0 1 1 1 REC_HEAD 20 20 0
SIZE_OF_VERIFICATION_DATA Size of the verification data and
auxiliary data to follow, N
0 bytes 1 1 1 u-integer4 4 4 20
VERIFICATION_DATA Verification and auxiliary data
ordered as per Section 7.3
N 1 1 u-byte 1 221000 24
TYPICAL TOTAL SIZE 221024
1 of 2
Doc Ref: EUM.EPS.SYS.SPE.990003.ANX
IASI_Level_1_Product_Format_Specification_-_Annex[1].xls
Worksheet: Parameters
Name Size Descriptio
n
1 1
2 2
3 3
4 4
5 5
6 6
10 10
16 16
19 19
21 21
30 30
32 32
40 40
64 64
100 100
148 148
550 550
4319 4319
4320 4320
10000 10000
12500 12500
AMCO 100 Number of columns for AVHR image pixel
AMLI 100 Number of lines for AVHRR image pixel
CCD 2 Number of corner cube directions
IMCO 64 Number of columns for IASi imager pixel
IMLI 64 Number of lines for IASI imager pixel
MAXBA 3600 Maximum number of samples in one IASI band
N 221000 Typical size of packets stored in MDR-Verification
NBK 6 Number of AVHRR channels
NCL 7 Number of classes for FOV sounder analysis
NIM 28 Number of samples used to represent the imaginary part of the
IASI spectrum
PN 4 Number of sounder pixels
SB 3 Number of spectral bands
SGI 25 5 x 5 - Number of pixels of the subgrid imager
Parameters used in the IASI array sizing
From IA-TN-2100-9469-CNE, Edition 5, Rev 1, 20/11/01
2 of 2
Doc Ref: EUM.EPS.SYS.SPE.990003.ANX
IASI_Level_1_Product_Format_Specification_-_Annex[1].xls
Worksheet: Parameters
SNOT 30 Number of steps for observational target
SNOT+4 34 Number of steps for observational and calibration targets
SS 8700 Number of samples in an IASI spectrum
VP 1 Number of verification packets per IASI line
1 of 2
Doc Ref: EUM.EPS.SYS.SPE.990003.ANX
IASI_Level_1_Product_Format_Specification_-_Annex[1].xls
Worksheet: Types
NOTE: Table must be sorted into ascending order
Field Type Size in Bytes
bitst(8) 1
boolean 1
byte 1
char(1) 1
e-char(1) 1
enumerated 1
u-byte 1
bitst(16) 2
char(2) 2
e-char(2) 2
integer2 2
u-integer2 2
V-BYTE 2
VU-BYTE 2
bitst(24) 3
char(3) 3
e-char(3) 3
V-INTEGER2 3
VU-INTEGER2 3
bitst(32) 4
bitst(32)[real*4] 4
char(4) 4
integer4 4
u-integer4 4
V-INTEGER4 5
VU-INTEGER4 5
bitst(48) 6
short cds time 6
bitst(64) 8
bitst(64)[real*8] 8
integer8 8
long cds time 8
u-integer8 8
V-INTEGER8 9
2 of 2
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IASI_Level_1_Product_Format_Specification_-_Annex[1].xls
Worksheet: Types
VU-INTEGER8 9
general time 15
bitst(128) 16
REC_HEAD 20
bitst(256) 32
char(40) 40
char(88) 88
1 of 1
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IASI_Level_1_Product_Format_Specification_-_Annex[1].xls
Worksheet: SPHR-DELETED
FIELD DESCRIPTION SF UNITS TYPE ENCODE
CHARS
FIELD SIZE OFFSET
RECORD_HEADER
Generic Record Header 0 REC_HEAD 20 20 0
SPARES
Nothing defined for SPHR
TOTAL SIZE
0
