Update History

• 13/06/2025 – new coefficients for Sentinel-3C/D SLSTR
• 29/05/2025 – MetopSG MetImage coefficients updated with new spectral response data
• 22/05/2025 – new coefficients for GeoXO GXS hyperspectral sounder
• 07/05/2025 – new coefficients for Tomorrow.io 1-6 TMS sounders, and updated coefficients for FY-3E HIRAS-2
• 11/03/2025 – correction to channel 1 in Copernicus Sentinel LSTM coefficients
• 27/02/2025 – new Copernicus Sentinel LSTM coefficients
• 11/02/2025 – new EarthCARE CPR coefficients
• 10/02/2025 – new SMAP coefficients
• 10/02/2025 – RTTOV v14.0 released with associated new MW optical depth coefficients

• 13/12/2024 – all MHS coefficients updated with corrected pass band specifications, and SMOS/MIRAS coefficients updated with Stokes3/4 channels added
• 06/12/2024 – new MFASIS-NN coefficients for FY-4B AGRI
• 02/12/2024 – updated coefficients for MTG-IRS based on revised channel specification (as of summer 2024). New Hamming Apodisation On Top Of Light Apodisation (HAOTOLA) coefficients replace the previous Hamming apodised coefficients. NLTE coefficients updated for HAOTOLA SRF with NLTE bug fix applied.
• 02/12/2024 – IASI-NG coefficients updated with broader SRF and are now NLTE-enabled for relevant channels.
• 02/12/2024 – IASI coefficients updated with corrected NLTE coefficients after bug fix (only affects NLTE simulations)
• 15/11/2024 – new coefficients for MODIS based on collection 7 SRF shifts
• 05/11/2024 – new coefficients for Microsat-2C (EOS-8) EOIR and updated coefficients for NASA SBG
• 11/07/2024 – updated/new NLTE coefficients for: IASI (updated, now based on LBLRTM v12.8), MTG-IRS Hamming apodised (new, based on LBLRTM v12.8), AIRS (new, based on LBLRTM 12.2)
• 01/07/2024 – new coefficients for AWS EPS-Sterna PFM based on measured SRFs
• 26/04/2024 – new coefficients for AIRS L1C (variable O3 and O3+CO2)
• 12/03/2024 – new coefficients for Jiheng-1
• 27/02/2024 – updated coefficients for MetopSG MWI based on updated passband data
• 23/02/2024 – hydrotable for MetopSG MWI corrected
• 23/02/2024 – new coefficients for FY-3G MWRI-RM, PMR
• 12/02/2024 – new coefficients for FY-3F MWHS-2, MWRI-2, MWTS-3
• 11/01/2024 – new coefficients for FY-3F MERSI-3, FY-3G MERSI-RM, INSAT-3DS sounder
• 30/11/2023 – new coefficients for FY-4B GIIRS
• 18/09/2023 – new coefficients for INSAT-3DS imager
• 25/08/2023 – updated coefficients for NOAA-21 ATMS based on updated SRF data
• 01/08/2023 – new MFASIS LUT files for MTG-1 FCI
• 03/07/2023 – new coefficients for Landsat-9 TIRS and OLI, and CO2M-A CLIM
• 16/05/2023 – fix errors in updated TROPICS Pathfinder coefficients and new coefficients for Microsat2b MHS based on SRFs
• 17/04/2023 – new coefficients for DMSP SSM/T
• 05/04/2023 – new coefficients for WSF-M MWI
• 30/03/2023 – updated coefficients for MetopSG MWI with corrected polarisations and updated passbands
• 30/03/2023 – updated MFASIS-NN coefficients for HIM-8/9 AHI, EOS-1 MODIS, N20 VIIRS supporting more channels
• 29/03/2023 – updated coefficients for TROPICS-0 (demonstrator) and new coefficients for TROPICS-3/5/6/7
• 31/01/2023 – new coefficients for FY-3E HIRAS-2
• 23/01/2023 – new coefficients for GOSAT-GW AMSR-3
• 16/12/2022 – updated Landsat-7 TM coefficients now including visible channels and new coefficients for Oceansat-3 SSTM
• 16/12/2022 – MFASIS-NN coefficient files for additional sensors added
• 01/12/2022 – new MFASIS-NN coefficient files for the RTTOV v13.2 release
• 23/11/2022 – new coefficients for NOAA-21 ATMS based on measured spectral responses
• 21/10/2022 – new coefficients for Microsat2b MHS and updated FY-3E MWTS3 coefficients with corrected polarisations
• 05/10/2022 – new coefficients for FY-4B AGRI
• 13/09/2022 – new coefficients for FY-3E MWHS2 based on measured SRFs
• 28/07/2022 – new coefficients for DMSP 1-4 SSH
• 06/07/2022 – new coefficients for NOAA-21 VIIRS
• 01/07/2022 – new MFASIS LUT files (based on “Deff” CLW properties) for GOES-18 ABI
• 29/06/2022 – new coefficients for NIMBUS-5 NEMS, NIMBUS-5/6 ESMR, and updated coefficients for NIMBUS-6 SCAMS
• 27/06/2022 – new MFASIS LUT files (based on OPAC CLW properties) for GOES-18 ABI
• 18/05/2022 – new coefficients for Earth-CARE MSI (IR channels only) and MTG-FCI coefficients with updated channel central wavenumbers
• 09/05/2022 – new coefficients for POLSIR and new AWS coefficients with updated spectroscopy
• 11/02/2022 – new coefficients for FY-3E MERSI-LL (IR channels only)
• 31/01/2022 – new coefficients for AWS and FY-3E MWTS-3, and updated coefficients for MTG-1 FCI
• 12/01/2022 – change polarisations for TROPICS coefficients
• 17/11/2021 – add new Metop-3 GOME-2 coefficients: it is recommended to use RTTOV v13.1 for UV simulations.
• 09/11/2021 – add new MW coefficients based on measured spectral response functions for various sensors
• 31/08/2021 – add new MFASIS LUTs for GEO-KOMPSAT-2A AMI
• 25/06/2021 – add new coefficients for the MVIRI visible channel
• 11/05/2021 – add new coefficients for FY-8(H) VISSR and the NASA SBG mission
• 10/05/2021 – update satellite ID to 2 for MetopSG MWI and ICI for consistency (metopsg_1-6 => Metop D-I); this is a superficial change with no impact on simulation results
• 10/05/2021 – update satellite ID to 2 for MTG-IRS for consistency (mtg_1-6 => Meteosat 12-17); this is a superficial change with no impact on simulation results
• 10/05/2021 – add new coefficients for TRISHNA-TIR
• 04/05/2021 – GEO-KOMPSAT2 AMI coefficients updated with modified channel wavenumbers and spectral responses
• 29/03/2021 – new coefficients for MTG-IRS with Hamming apodisation, FORUM, and Meteor-M2 IKFS2 based on LBLRTM v12.8
• 09/03/2021 – IRIS “C3S” coefficients updated with shifted channel wavenumbers
• 26/01/2021 – new MFASIS LUT files for DSCOVR EPIC
• 25/11/2020 – RTTOV v13.0 released with associated coefficient updates

• 23/11/2020 – new OMS GEMS1 coefficients
• 17/08/2020 – FY-3D HIRAS NSR and FSR coefficients with all variable trace gases including SO2
• 19/05/2020 – Metop-SG METImage coefficients updated with new spectral response data
• 14/05/2020 – new coefficients for Sentinel2-A/B MSI and DSCOVR EPIC
• 12/05/2020 – new v9predictor MTG-IRS coefficients with all trace gases (except SO2)
• 07/05/2020 – new Sentinel3-B OLCI coefficients
• 30/03/2020 – new coefficients for ESA Earth Explorer 9 mission FORUM
• 23/03/2020 – new coefficients for Sentinel3 MWR
• 26/02/2020 – new coefficients for GPM DPR replacing previous erroneous version
• 26/02/2020 – new coefficients for HY-2A MWRI replacing previous erroneous version
• 18/02/2020 – new coefficients for FY-4A GIIRS
• 17/12/2019 – updated coefficients for FY-3D HIRAS NSR and FSR
• 05/12/2019 – updated channel polarisations for Metop-SG MWS
• 05/12/2019 – modified sensor ID for HY-2A MWRI
• 05/12/2019 – new coefficients for Jason-CS AMR-C
• 26/11/2019 – new coefficients for Electro-L No2 MSU-GS
• 21/10/2019 – update Geo-Kompsat-2A coefficients with latest SRF data
• 16/10/2019 – new coefficients for old sensors on the Nimbus platforms created for Copernicus Climate Change Services: IRIS, HRIR, MRIR, SIRS
• 21/08/2019 – add MFASIS LUT files for MSG-1 and 2 SEVIRI
• 11/07/2019 – new coefficients for FY-3C VIRR
• 23/04/2019 – add NLTE coefficients to CrIS and CrIS FSR coefficient files
• 25/03/2019 – updates for v12.3 release: new HTFRTC static file enabling new features including additional trace gases, and new MFASIS LUT files for SEVIRI enabling the new water vapour correction for the 0.8um channel
• 06/03/2019 – fix in MERSI-2 coefficients: the file contained an extra channel (channel 4 was a duplicate of channel 3) which has been removed so that it now has 25 channels
• 11/12/2018 – new coefficients for FY-3D HIRAS
• 26/11/2018 – new coefficients for MERSI-2 and Metop-C AVHRR central wavenumbers and band correction coefficients updated with new information (optical depth coefficient values are unchanged)
• 31/10/2018 – MFASIS look-up tables (LUTs) for SEVIRI, GOES ABI and Himawari AHI available for download; see also associated v12.2 code update dated 30/10/2018
• 10/09/2018 – Metop-C AVHRR central wavenumbers and band correction coefficients updated with new information (optical depth coefficient values are unchanged)
• 05/09/2018 – CrIS-FSR instrument ID changed from 27 to 28 (see note below the hi-res IR sounder table on the coefficients web page
• 28/08/2018 – new Meteor-M N2 MSU-MR coefficients
• 13/08/2018 – update MTG-IRS coefficients using most recent apodisation function
• 10/08/2018 – new Metop-C AVHRR coefficients
• 10/08/2018 – updated ECOSTRESS coefficients with revised spectral responses
• 10/08/2018 – FY3-C and -D MWHS-2 and MWTS-2 coefficients updated due to wrong polarisations in some channels
• 12/07/2018 – new Sentinel3-B SLSTR coefficients
• 30/05/2018 – new FY4A AGRI coefficients
• 25/05/2018 – add Nimbus-4 IRIS “shifted” coefficient file (see note under the table of hyperspectral sounder coefficient files)
• 09/05/2018 – update IASI sccldcoef files to include the new cloud liquid water Deff optical properties
• 26/04/2018 – updated RTTOV-SCATT Mietable files using new CLW permittivity parameterisation and new Mietable file for ICI
• 20/04/2018 – new HTFRTC coefficients for a variety of hyperspectral IR sounders including MTG-IRS with light apodisation
• 17/04/2018 – new HY-2A MWRI coefficients
• 06/04/2018 – add new files for v12.2 release including new/updated PC-RTTOV, HTFRTC, MFASIS, and visible/IR sccldcoef files
• 13/02/2018 – add visible/IR sensor aerosol files containing optical properties for CAMS species
• 29/01/2018 – update satellite height in JPSS-0 (SNPP) and NOAA-20 ATMS coefficient files from 824 to 833km
• 11/12/2017 – add TROPICS coefficients
• 11/12/2017 – rename all Meteor-M N2 “IRFS2” coefficient files to “IKFS2”
• 06/12/2017 – new NOAA-20 ATMS coefficients
• 25/10/2017 – new NOAA-20 VIIRS coefficients
• 19/10/2017 – updated COMS MI coefficients with shifted WV channel, updated HIRS shifted coefficients for NOAA-6,7,8
• 26/09/2017 – all MW coefficient files updated with band-correction coefficients
• 15/09/2017 – update CLARREO-MRFIRS and TICFIRE-MBFIRI coefficients due to bug affecting IREMIS coefficients for channels in the range 34-38µm
• 24/08/2017 – add new GaoFen-5 VIMS coefficients
• 10/07/2017 – add new GEO-KOMPSAT-2 AMI coefficients and update ECOSTRESS coefficients with new SRF data
• 30/05/2017 – update all HIRS-shifted coefficients
• 18/05/2017 – add SMOS MIRAS and ORS COWVR coefficients
• 24/03/2017 – add FY2E/G VISSR coefficients
• 20/03/2017 – there was an error in the calculation of the IASI and IASI-NG variable SO2 coefficients. New files have been generated which give an improved fit to the line-by-line training data.
• 06/03/2017 – update CLARREO MRFIRS coefficients (there was a problem affecting channel 1), add IR-only coefficient files for GMS 1-4 imager and VIS+IR coefficient files for GMS 1-5 imager.
• 21/02/2017 – RTTOV v12.1 released with associated coefficient updates.

• 13/01/2017 – add INSAT-3DR imager and sounder and GCOM-C 1 SGLI coefficients (under IR instruments and VIS/IR instruments).
• 12/01/2017 – AATSR-shifted coefficients updated. The shift in the 12µm channel is now 40nm instead of 50nm (under IR instruments and VIS/IR instruments).
• 05/09/2016 – GOES-16 ABI and ISS ECOSTRESS coefficients updated with latest SRF data and add GOES 17-19 ABI coefficients (under IR instruments and VIS/IR instruments).
• 26/05/2016 – all non-zeeman MW coefficients updated due to bug fixes and improvements to line by line code – new Zeeman coefficients to follow (under MW instruments).
• 13/05/2016 – add Himawari-9 AHI coefficients (under IR instruments and VIS/IR instruments).
• 18/02/2016 – add Mietable files for MWS and MWI (under MW instruments).
• 20/01/2016 – add coefficients for INSAT3-D imager and sounder instruments (under IR instruments).
• 19/11/2015 – add coefficients for MWR instrument (under MW instruments).
• 17/11/2015 – add coefficients for ECOSTRESS instrument on the ISS (under IR instruments).
• 16/11/2015 – updates to v9 predictor coefficients for AVHRR on Metop and NOAA 15-18, VISSR on FY2-3 and 4, ASTER and VIIRS: non-solar channels are now only trained over the more limited range of zenith angles up to 65 degrees (under VIS/IR instruments).
• 08/10/2015 – new Sentinel-3 SLSTR coefficients with updated SRFs (under VIS/IR instruments and IR instruments).
• 25/09/2015 – new PC-RTTOV coefficients valid over all surface types for RTTOV v11.3 (under hi-res IR instruments).
• 25/09/2015 – all IR and MW v7/v8 predictor coefficients regenerated with bugs fixed in coefficient generation. (NB Work is underway to generate new Zeeman coefficients; the AMSU-A shifted coefficients are under review and have not been regenerated; v9 predictor and SSU coefficients are unaffected and have not been regenerated).
• 25/09/2015 – MODIS and FY-3 IRAS coefficients updated with some channels now being Planck-weighted (under VIS/IR instruments and IR instruments).
• 17/07/2015 – add Jason-2 AMR coefficients (under MW instruments).
• 10/07/2015 – add Nimbus-3 MRIR coefficients (under IR instruments).
• 09/07/2015 – add SSM/T2 coefficients (under MW instruments).
• 09/07/2015 – add MetopSG preliminary ICI coefficients (under MW instruments).
• 08/07/2015 – add MetopSG MetImage coefficients (under VIS/IR instruments and IR instruments).
• 03/07/2015 – add MetopSG MWI and MWS coefficients (under MW instruments).
• 24/06/2015 – Nimbus 4 IRIS coefficients updated with coefficients for full spectral range (under hires).
• 05/03/2015 – add F-19 SSMIS coefficient file (under MW instruments).
• 25/02/2015 – add CrIS full spectral resolution (FSR) coefficient files (under hi-res IR instruments).
• 15/01/2015 – add Meteor-M 2 MTVZA-GY coefficient file (under MW instruments).
• 05/12/2014 – add MSG-4 SEVIRI coefficient files (under VIS/IR instruments and IR instruments).
• 04/12/2014 – add link to script which can download all or any required coefficient files
• 02/09/2014 – updated ATSR/AATSR v9 predictor coefficient files (under VIS/IR instruments).
• 18/08/2014 – add NOAA 5-14 AVHRR v9 predictor coefficients (under VIS/IR instruments) and AATSR coefficients with shifted 12um channel (under VIS/IR instruments and IR instruments).
• 25/07/2014 – further correction to GMI Mietable file and addition of Windsat Mietable (under MW instruments).
• 18/07/2014 – added missing 1.6 micron channel to the NOAA-19 AVHRR VIS/IR v9 predictor coefficient file (under VIS/IR instruments).
• 03/07/2014 – correction to GMI Mietable file (under MW instruments).
• 02/07/2014 – start adding information on spectral response functions/pass-bands and comparisons against LBL simulations.
• 17/06/2014 – added FY3-C MWTS2, MWHS2 and MWRI coefficients (under MW instruments).
• 12/06/2014 – added EOS-1 ASTER coefficients (under IR and VIS/NIR/IR).
• 12/06/2014 – added v9 predictor (all trace gas) CrIS coefficients (under hi-res IR instruments).
• 12/06/2014 – updated AHI and FCI v7 predictor coefficients (under IR instruments).
• 12/06/2014 – updated ABI, AHI, FCI, MODIS, MODIS-shifted, OLI, SLSTR and VIIRS v9 predictor coefficients (under VIS/NIR/IR instruments).
• 07/05/2014 – begin keeping log of coefficient file histories. Where files have changed their entries in this log are linked from the “Date of file creation” in the tables below.
• 07/05/2014 – correction to NOAA-18/19 MHS coefficients (under MW instruments): the channel central wavenumbers and band corrections were mistakenly taken from the AMSU-B files.
• 27/02/2014 – updated GPM GMI coefficients with revised channel specification (under MW instruments).
• 21/02/2014 – added information about coefficient regression limits.
• 19/02/2014 – updated v9 predictor (all trace gas) coefficients for AIRS, IASI and IASI-NG based on LBLRTM v12.2 (under hires instruments).
• 13/02/2014 – added shifted AMSU-A coefficients (under MW instruments).
• 24/01/2014 – added GPM GMI coefficients (under MW instruments).
• 20/11/2013 – added MTG-FCI coefficients (under IR and VIS/NIR/IR).
• 15/11/2013 – added coefficients for Nimbus 4 IRIS (under hires), Landsat 8 OLI (under VIS/NIR/IR) and Nimbus 7 SMMR (under MW).
• 15/10/2013 – added new coefficients for IASI-NG, experimental coefficients for MTG-IRS, and v8 predictor coefficients with variable CO2 for AIRS, CrIS and IASI.
• 15/10/2013 – added notes on coefficient conversion and channel subset extraction.
• 07/10/2013 – added aerosol coefficients for HIRS and MODIS “shifted” rtcoef files (under IR instruments).
• 03/10/2013 – correction to Windsat coefficient file (under MW instruments): the sensor ID was incorrectly specified as “mw” instead of “po”.
• 10/09/2013 – updated Mie table files for MW instruments. See the notes below for a description of the changes.
• 10/09/2013 – added coefficient file for Landsat 8 TIRS in IR instruments.
• 01/08/2013 – the 101L v7 and v9 predictor hi-res sounder files including NLTE coefficients uploaded previously were incorrect and have now been updated.
• 19/06/2013 – NLTE coefficients added to the hi-res sounder files.