RTTOV v11 Coefficient File Downloads
Contents
NB This page is no longer actively maintained. Please consider updating to the latest version of RTTOV.
Additional information about coefficient files (NB that page has been updated for the latest version of RTTOV so not all information may apply to RTTOV v11 coefficients).
Script for downloading coefficient files (run from within rtcoef_rttov11/ directory)
Hi-res IR sounder optical depth coefficients
All hi-res IR sounder coefficient files share these characteristics:
- Based on LBLRTM v12.2 line-by-line model
- No Planck-weighted channels
RTTOV v10 compatibility:
- All ASCII optical depth coef files may be used with RTTOV v10, but new functionality such as NLTE is not available in v10
- Cloud coef files are v10-compatible (they are the same as the v10 files)
- Aerosol coef files and PC coef files cannot be read by RTTOV v10
Downloads
- All files are linked in the table below.
- Due to the large size of the hi-res sounder files HDF5 is the preferred format for them. Please contact the NWP SAF Helpdesk to request an ASCII version of a file if required. See the user guide for information on converting between coefficient file formats and extracting subsets of channels from coefficient files.
- HDF5 files were created using the HDF5 compression so your HDF5 library must have been compiled against zlib to read these files: this usually happens automatically when building HDF5.
- Currently the test scripts expect the HDF5 versions of the v7 and v9 predictor AIRS, IASI files and the associated aerosol, cloud and PC files.
- The same cloud and aerosol coefficient files are used with v7, v8 and v9 predictor optical depth coefficient files.
- Extract to folders as follows:
- v7 predictor 54L rtcoef files – extract to rtcoef_rttov11/rttov7pred54L/
- v7 predictor 101L rtcoef files – extract to rtcoef_rttov11/rttov7pred101L/
- v8 predictor 101L rtcoef files – extract to rtcoef_rttov11/rttov8pred101L/
- v9 predictor 101L rtcoef files – extract to rtcoef_rttov11/rttov9pred101L/
- All cloud/aerosol files – extract to rtcoef_rttov11/cldaer/
- All PC files – extract to rtcoef_rttov11/pc/
| Sensor | Levels | Predictors version | Trace gases | Solar? | NLTE? | PC? | Filename | Date of file creation | Associated aerosol coef filename | Associated cloud coef filename | Associated PC coef filename |
|---|---|---|---|---|---|---|---|---|---|---|---|
| AIRS | 54 | 7 | O3 | N | Y | N | rtcoef_eos_2_airs.H5 | 21/07/2015 | scaercoef_eos_2_airs.H5 | sccldcoef_eos_2_airs.H5 | - |
| AIRS | 101 | 7 | O3 | N | Y | N | rtcoef_eos_2_airs.H5 | 21/07/2015 | As above | As above | - |
| AIRS | 101 | 8 | O3, CO2 | N | Y | N | rtcoef_eos_2_airs.H5 | 23/07/2015 | As above | As above | - |
| AIRS | 101 | 9 | O3, CO2, CO, N2O, CH4 | Y | Y | Y | rtcoef_eos_2_airs.H5 | 01/02/2014 | As above | As above | pccoef_eos_2_airs.H5 (clear-sky) pccoef_eos_2_airs_landsea.H5 (clear-sky, all surfaces) See notes below. |
| CrIS | 54 | 7 | O3 | N | Y | N | rtcoef_jpss_0_cris.H5 | 21/07/2015 | scaercoef_jpss_0_cris.H5 | sccldcoef_jpss_0_cris.H5 | - |
| CrIS | 101 | 7 | O3 | N | Y | N | rtcoef_jpss_0_cris.H5 | 21/07/2015 | As above | As above | - |
| CrIS | 101 | 8 | O3, CO2 | N | Y | N | rtcoef_jpss_0_cris.H5 | 23/07/2015 | As above | As above | - |
| CrIS | 101 | 9 | O3, CO2, CO, N2O, CH4 | Y | Y | N | rtcoef_jpss_0_cris.H5 | 23/05/2014 | As above | As above | - |
| CrIS FSR | 54 | 7 | O3 | N | Y | N | rtcoef_jpss_0_cris-fsr.H5 | 21/07/2015 | - | - | - |
| CrIS FSR | 101 | 7 | O3 | N | Y | N | rtcoef_jpss_0_cris-fsr.H5 | 21/07/2015 | - | - | - |
| CrIS FSR | 101 | 8 | O3, CO2 | N | Y | N | rtcoef_jpss_0_cris-fsr.H5 | 23/07/2015 | - | - | - |
| CrIS FSR | 101 | 9 | O3, CO2, CO, N2O, CH4 | Y | Y | N | rtcoef_jpss_0_cris-fsr.H5 | 17/12/2014 | - | - | - |
| IASI | 54 | 7 | O3 | N | Y | N | rtcoef_metop_2_iasi.H5 | 21/07/2015 | scaercoef_metop_2_iasi.H5 | sccldcoef_metop_2_iasi.H5 | - |
| IASI | 101 | 7 | O3 | N | Y | N | rtcoef_metop_2_iasi.H5 | 21/07/2015 | As above | As above | - |
| IASI | 101 | 8 | O3, CO2 | N | Y | N | rtcoef_metop_2_iasi.H5 | 23/07/2015 | As above | As above | - |
| IASI | 101 | 9 | O3, CO2, CO, N2O, CH4 | Y | Y | Y | rtcoef_metop_2_iasi.H5 | 01/02/2014 | As above | As above | pccoef_metop_2_iasi.H5 (clear-sky, sea-only) pccoef_metop_2_iasi_landsea.H5 (clear-sky, all surfaces) See notes below. |
| IASI-NG | 101 | 7 | O3 | N | N | N | rtcoef_metopsg_1_iasing.H5 | 21/07/2015 | - | - | - |
| IASI-NG | 101 | 8 | O3, CO2 | N | N | N | rtcoef_metopsg_1_iasing.H5 | 23/07/2015 | - | - | - |
| IASI-NG | 101 | 9 | O3, CO2, CO, N2O, CH4 | Y | N | Y | rtcoef_metopsg_1_iasing.H5 | 01/02/2014 | - | - | pccoef_metopsg_2_iasing.H5 (clear-sky, sea-only) See notes below. |
| IRIS | 101 | 8 | O3, CO2 | N | N | N | rtcoef_nimbus_4_iris.H5 | 23/07/2015 | - | - | - |
Updated PC coefficients
- New principal components coefficients use different predictor channel sets to previous versions of the files. You can obtain the appropriate predictor channel set in your own code using the rttov_get_pc_predictindex subroutine as demonstrated in src/test/example_pc_fwd.F90.
- The older sea-only coefficient files must only be used over sea surfaces with calcemis(:) set to true (this is not enforced by RTTOV v11.3).
- The new all-surface “landsea” PC coefficients can be used for all surface types: it is recommended to set calcemis(:) to true over sea surfaces and to use the IR emissivity atlas for land and sea-ice surfaces, but this is not strictly mandatory.
- These latter global PC coefficients can only be used over land and sea-ice surfaces with RTTOV v11.3 (such simulations will fail with v11.1 and v11.2).
Metop-B IASI coefficients
The Metop-B (i.e. metop_1) IASI optical depth coefficient file is identical to the Metop-A (metop_2) coefficient file except that the satellite ID is 1 (for Metop-B) instead of 2 (for Metop-A). If you read the coefficients by filename you can use the same file for either instrument. However if distinct files are required an ASCII Metop-A optical depth coefficient file can be used to generate a Metop-B file using the Perl script make_metopb_iasi.pl as follows:
$ ./make_metopb_iasi.pl < rtcoef_metop_2_iasi.dat
where rtcoef_metop_2_iasi.dat is any Metop-A ASCII IASI coefficient file. This creates a new file rtcoef_metop_1_iasi.dat in the current directory.
The IASI cloud/aerosol scattering and PC coefficient files are identical for Metop-A and Metop-B.
MTG-IRS coefficients
Experimental MTG-IRS coefficients have been generated using transmittances from simulated IASI spectra and a Hamming apodisation function.
| Sensor | Levels | Predictors version | Trace gases | Solar? | NLTE? | PC? | Filename | Date of file creation | Associated aerosol coef filename | Associated cloud coef filename | Associated PC coef filename |
|---|---|---|---|---|---|---|---|---|---|---|---|
| MTG-IRS (experimental) | 101 | 7 | O3 | N | N | N | rtcoef_mtg_1_irs-hamming.H5 | 21/07/2015 | - | - | - |
| MTG-IRS (experimental) | 101 | 8 | O3, CO2 | N | N | N | rtcoef_mtg_1_irs-hamming.H5 | 23/07/2015 | - | - | - |
IR optical depth coefficients
All IR coefficient files share these characteristics:
- Based on LBLRTM v12.2 line-by-line model (except SSU which is based on LBLRTM v12.0)
- 54 levels (except SSU which is on 51 levels)
- Not solar compatible
- Not NLTE compatible
- Not PC compatible
RTTOV v10 compatibility:
- The new SSU PMC shift files are not v10-compatible
- All other rtcoef files are v10-compatible
- All cloud coef files are v10-compatible (they are the same as the v10 files)
- Aerosol coef files are not v10-compatible
- Note that the SLSTR and FY2-2 VISSR instrument names and IDs and the GMS imager instrument ID have changed since v10
Downloads
- 54L v7 predictor files for all IR sensors – extract to rtcoef_rttov11/rttov7pred54L/
- 54L v8 predictor files – extract to rtcoef_rttov11/rttov8pred54L/
- 51L v8 predictor SSU files – extract to rtcoef_rttov11/rttov8pred51L/
- Aerosol scattering coefficient files for all sensors – extract to rtcoef_rttov11/cldaer/
- Cloud scattering coefficient files for all sensors – extract to rtcoef_rttov11/cldaer/
| Sensor | Planck weighted | Predictors version | Trace gases | Filename | Date of file creation | Associated aerosol coef filename | Associated cloud coef filename |
|---|---|---|---|---|---|---|---|
| (A)ATSR* | Y | 7 | O3 | rtcoef_ers_x_atsr.dat rtcoef_envisat_1_atsr.dat | 21/07/2015 | scaercoef_ers_x_atsr.dat scaercoef_envisat_1_atsr.dat | sccldcoef_ers_x_atsr.dat sccldcoef_envisat_1_atsr.dat |
| AATSR-shifted Info on AATSR 12 um anomaly | Y | 7 | O3 | rtcoef_envisat_1_atsr-shifted.dat | 29/11/2016 | - | - |
| ABI | Y | 7 | O3 | rtcoef_goes_xx_abi.dat | 31/08/2016 | scaercoef_goes_xx_abi.dat | - |
| AHI | Y | 7 | O3 | rtcoef_himawari_x_ahi.dat | 21/07/2015 13/05/2016 | scaercoef_himawari_x_ahi.dat | sccldcoef_himawari_x_ahi.dat |
| ASTER | Y | 7 | O3 | rtcoef_eos_1_aster.dat | 21/07/2015 | scaercoef_eos_1_aster.dat | - |
| AVHRR | Y | 7 | O3 | rtcoef_noaa_xx_avhrr.dat rtcoef_metop_x_avhrr.dat | 21/07/2015 | scaercoef_noaa_xx_avhrr.dat scaercoef_metop_x_avhrr.dat | sccldcoef_noaa_xx_avhrr.dat sccldcoef_metop_x_avhrr.dat |
| ECOSTRESS | Y | 7 | O3 | rtcoef_iss_1_ecostres.dat | 01/09/2016 | - | - |
| FCI | Y | 7 | O3 | rtcoef_mtg_1_fci.dat | 21/07/2015 | scaercoef_mtg_1_fci.dat | - |
| GMS imager | Y | 7 | O3 | rtcoef_gms_5_imager.dat | 21/07/2015 | scaercoef_gms_5_imager.dat | sccldcoef_gms_5_imager.dat |
| GOES imager | Y | 7 | O3 | rtcoef_goes_xx_imager.dat | 21/07/2015 | scaercoef_goes_xx_imager.dat | sccldcoef_goes_xx_imager.dat |
| GOES sounder | GOES 4-7 only | 7 | O3 | rtcoef_goes_xx_sounder.dat | 21/07/2015 | scaercoef_goes_xx_sounder.dat | sccldcoef_goes_xx_sounder.dat |
| HIRS | N | 7 | O3 | rtcoef_noaa_xx_hirs.dat rtcoef_metop_x_hirs.dat | 27/07/2015 | scaercoef_noaa_xx_hirs.dat scaercoef_metop_x_hirs.dat | sccldcoef_noaa_xx_hirs.dat sccldcoef_metop_x_hirs.dat |
| HIRS | N | 8 | O3, CO2 | rtcoef_noaa_xx_hirs.dat rtcoef_metop_x_hirs.dat rtcoef_nimbus_6_hirs.dat | 27/07/2015 | As above | As above |
| HIRS shifted spectral response | N | 7 | O3 | rtcoef_noaa_xx_hirs-shifted.dat rtcoef_metop_x_hirs-shifted.dat | 27/07/2015 | scaercoef_noaa_xx_hirs-shifted.dat scaercoef_metop_x_hirs-shifted.dat | - |
| HIRS shifted spectral response | N | 8 | O3, CO2 | rtcoef_noaa_xx_hirs-shifted.dat rtcoef_metop_x_hirs-shifted.dat | 27/07/2015 | As above | - |
| IIR | Y | 7 | O3 | rtcoef_calipso_1_iir.dat | 21/07/2015 | scaercoef_calipso_1_iir.dat | - |
| INSAT-3D(R) imager | Y | 7 | O3 | rtcoef_insat3_x_imager.dat | 19/01/2016 12/11/2016 | - | - |
| INSAT-3D(R) sounder | Y | 7 | O3 | rtcoef_insat3_x_sounder.dat | 19/01/2016 13/11/2016 | - | - |
| IRAS | N | 7 | O3 | rtcoef_fy3_1_iras.dat | 22/07/2015 | scaercoef_fy3_1_iras.dat | - |
| MetImage | Y | 7 | O3 | rtcoef_metopsg_1_metimage.dat | 21/07/2015 | - | - |
| MI | Y | 7 | O3 | rtcoef_coms_1_mi.dat | 21/07/2015 | scaercoef_coms_1_mi.dat | sccldcoef_coms_1_mi.dat |
| MODIS | N | 7 | O3 | rtcoef_eos_x_modis.dat | 22/07/2015 | scaercoef_eos_x_modis.dat | sccldcoef_eos_x_modis.dat |
| MODIS shifted spectral response | N | 7 | O3 | rtcoef_eos_x_modis-shifted.dat | 22/07/2015 | scaercoef_eos_x_modis-shifted.dat | - |
| MRIR | Y | 7 | O3 | rtcoef_nimbus_3_mrir.dat | 21/07/2015 | - | - |
| MRIR | Y | 8 | O3, CO2 | rtcoef_nimbus_3_mrir.dat | 23/07/2015 | - | - |
| MSUMR | Y | 7 | O3 | rtcoef_meteor-m_1_msumr.dat | 21/07/2015 | scaercoef_meteor-m_1_msumr.dat | - |
| MTSAT imager | Y | 7 | O3 | rtcoef_mtsat_x_imager.dat | 21/07/2015 | scaercoef_mtsat_x_imager.dat | sccldcoef_mtsat_x_imager.dat |
| MVIRI | Y | 7 | O3 | rtcoef_meteosat_x_mviri.dat | 21/07/2015 | scaercoef_meteosat_x_mviri.dat | sccldcoef_meteosat_x_mviri.dat |
| MVISR | N | 7 | O3 | rtcoef_fy1_x_mvisr.dat | 21/07/2015 | scaercoef_fy1_x_mvisr.dat | sccldcoef_fy1_x_mvisr.dat |
| SEVIRI | Y | 7 | O3 | rtcoef_msg_x_seviri.dat | 21/07/2015 | scaercoef_msg_x_seviri.dat | sccldcoef_msg_x_seviri.dat |
| SGLI | N | 7 | O3 | rtcoef_gcom-c_1_sgli.dat | 28/11/2016 | - | - |
| SLSTR | Y | 7 | O3 | rtcoef_sentinel3_1_slstr.dat | 08/10/2015 | scaercoef_sentinel3_1_slstr.dat | - |
| SSU 51L | N | 8 | O3, CO2 | rtcoef_noaa_xx_ssu.dat | 02/08/2012 (noaa-5,6) 09/08/2012 (noaa-7-9,14) 29/08/2012 (noaa-11) | - | - |
| SSU 51L with variable cell pressure | N | 8 | O3, CO2 | rtcoef_noaa_xx_ssu_pmcshift.dat | 10/01/2013 | - | - |
| THIR | Y | 7 | O3 | rtcoef_nimbus_x_thir.dat | 19/05/2016 | - | - |
| TIRS | N | 7 | O3 | rtcoef_landsat_8_tirs.dat | 21/07/2015 | scaercoef_landsat_8_tirs.dat | - |
| TM | N | 7 | O3 | rtcoef_landsat_x_tm.dat | 21/07/2015 | scaercoef_landsat_x_tm.dat | - |
| VIIRS | Y | 7 | O3 | rtcoef_jpss_0_viirs.dat | 21/07/2015 | scaercoef_jpss_0_viirs.dat | sccldcoef_jpss_0_viirs.dat |
| VISSR | Y | 7 | O3 | rtcoef_fy2_x_vissr.dat | 21/07/2015 | scaercoef_fy2_x_vissr.dat | sccldcoef_fy2_x_vissr.dat |
| VTPR | N | 7 | O3 | rtcoef_noaa_x_vtpr.dat | 21/07/2015 | - | - |
* The ERS-1 ATSR coefficient file contains coefficients for 6 channels: 1-3 are the standard channels (12, 11, 3.7 microns respectively) and 4-6 are additional coefficients for the 12 micron channel using spectral responses valid at different sensor temperatures. The corresponding aerosol coefficients have been generated using this coefficient file and as such contain data for the 6 channels in the rtcoef file. However the cloud coefficient file only contains parameters for the 3 standard channels (1-3, with 1 being the 12 micron channel). Therefore if you wish to use the cloudy coefficients for ERS-1 ATSR you should first extract channels 1-3 from the rtcoef file to a separate file using the rttov_conv_coef.exe executable.
Visible/IR solar-compatible optical depth coefficients
All visible/IR solar coefficient files share these characteristics:
- Based on LBLRTM v12.2 line-by-line model
- 54 levels
- v9 predictors
- Solar compatible
- Not NLTE compatible
- Not PC compatible
- No associated aerosol/cloud coefficient files
- Note that you can run IR-only simulations using these files, but you may find the v7 predictor files above give better results for IR channels.
- Channel numbering for IR channels may differ to the v7 predictor files above: check the coefficient file headers, the user guide or the sensor tables page.
RTTOV v10 compatibility:
- These files are not v10-compatible
Downloads
- v9 predictor solar files VIS/NIR/IR instruments – extract to rtcoef_rttov11/rttov9pred54L/
| Sensor | Planck weighted | Trace gases | Filename | Date of file creation |
|---|---|---|---|---|
| (A)ATSR | Y | O3 | rtcoef_ers_x_atsr.dat rtcoef_envisat_1_atsr.dat | 02/09/2014 |
| AATSR-shifted Info on AATSR 12 um anomaly | Y | O3 | rtcoef_envisat_1_atsr-shifted.dat | 29/11/2016 |
| ABI | Y | O3 | rtcoef_goes_xx_abi.dat | 01/09/2016 |
| AHI | Y | O3 | rtcoef_himawari_x_ahi.dat | 11/06/2014 13/05/2016 |
| ASTER | Y | O3 | rtcoef_eos_1_aster.dat | 16/11/2015 |
| AVHRR | Y | O3 | rtcoef_metop_x_avhrr.dat rtcoef_noaa_xx_avhrr.dat rtcoef_noaa_19_avhrr.dat | 06/09/2015 (Metop 1/2) 18/08/2014 (NOAA 5-14) 06/09/2015 (NOAA 15-18) 17/07/2014 (NOAA 19) |
| FCI | Y | O3 | rtcoef_mtg_1_fci.dat | 11/06/2014 |
| GOES imager | Y | O3 | rtcoef_goes_xx_imager.dat | 28/03/2013 |
| INSAT-3DR imager | Y | O3 | rtcoef_insat3_5_imager.dat | 13/11/2016 |
| IRAS | N | O3 | rtcoef_fy3_1_iras.dat | 04/09/2015 |
| MetImage | Y | O3 | rtcoef_metopsg_1_metimage.dat | 07/07/2015 |
| MI | Y | O3 | rtcoef_coms_1_mi.dat | 28/03/2013 |
| MODIS | N | O3 | rtcoef_eos_x_modis.dat | 04/09/2015 |
| MODIS shifted spectral response | N | O3 | rtcoef_eos_x_modis-shifted.dat | 04/09/2015 |
| MTSAT imager | Y | O3 | rtcoef_mtsat_x_imager.dat | 28/03/2013 |
| OLI | N | O3 | rtcoef_landsat_8_oli.dat | 11/06/2014 |
| SEVIRI | Y | O3 | rtcoef_msg_x_seviri.dat | 28/03/2013 (MSG 1-3) 05/12/2014 (MSG 4) |
| SLSTR | Y | O3 | rtcoef_sentinel3_1_slstr.dat | 08/10/2015 |
| VIIRS | Y | O3 | rtcoef_jpss_0_viirs.dat | 16/11/2015 |
| VISSR | Y | O3 | rtcoef_fy2_x_vissr.dat | 06/09/2015 |
MW optical depth coefficients
All MW sensor coefficient files share these characteristics:
- Based on Liebe 89/92 LbL model
- All on 54 levels except for the Zeeman files
- v7 predictors
- No Planck-weighted channels
- No optional trace gases
- Cloud liquid water is an optional input
- Not solar compatible
- Not NLTE compatible
- Not PC compatible
RTTOV v10 compatibility:
- All rtcoef files are v10-compatible
- All mietable files are v10-compatible
- The only caveat is that the AMSR-E instrument name and the AMSR2 instrument ID and name have changed since v10 (see note at the top of this page)
Downloads
- Files for all MW sensors – extract to rtcoef_rttov11/rttov7pred54L/
- Mie tables are linked in the table below – extract to rtcoef_rttov11/mietable/
Updated Mie tables (10/09/2013):
The original RTTOV-SCATT Mie coefficients produced unrealistically high amounts of scattering from snow hydrometeors at 30-50 GHz and insufficient scattering at 150-183 GHz. The new coefficients address this problem by representing snow hydrometeors as three-dimensional snowflakes rather than Mie spheres. While it is possible to improve Mie sphere results by tuning the snow particle density, it is difficult to improve results at all frequencies simultaneously. The new snow hydrometeor optical properties are based on the “sector snowflake” from the Liu (2008) database of discrete dipole computations for nonspherical ice particles. The new particle shape was chosen because it produces the best fit between observations and ECMWF simulations across frequencies from 10 to 183 GHz.
References:
- Liu, G. (2008). A database of microwave single-scattering properties for nonspherical ice particles. Bulletin of the American Meteorological Society, 89(10), 1563-1570.
- Geer, A.J. and F. Baordo (2014). Improved scattering radiative transfer for frozen hydrometeors at microwave frequencies. Atmos. Meas. Tech., 7, 1839-1860, doi:10.5194/amt-7-1839-2014
| Sensor | Zeeman compatible | Filename | Date of file creation | Associated Mietable filename |
|---|---|---|---|---|
| AltiKa | N | rtcoef_saral_1_altika.dat | 26/05/2016 | mietable_saral_altika.dat |
| AMR | N | rtcoef_jason_2_amr.dat | 26/05/2016 | - |
| AMSR-E | N | rtcoef_eos_2_amsre.dat | 26/05/2016 | mietable_eos_amsre.dat |
| AMSR2 | N | rtcoef_gcom-w_1_amsr2.dat | 26/05/2016 | mietable_gcom-w_amsr2.dat |
| AMSU-A | N | rtcoef_noaa_xx_amsua.dat rtcoef_metop_x_amsua.dat rtcoef_eos_2_amsua.dat | 26/05/2016 | mietable_noaa_amsua.dat mietable_metop_amsua.dat mietable_eos_amsua.dat |
| AMSU-A Zeeman (44L) | Y | rtcoef_noaa_xx_amsua_zeeman.dat rtcoef_metop_x_amsua_zeeman.dat rtcoef_eos_2_amsua_zeeman.dat | 04/07/2006 | As above |
| AMSU-B | N | rtcoef_noaa_xx_amsub.dat | 24/05/2017*** | mietable_noaa_amsub.dat |
| ATMS | N | rtcoef_jpss_0_atms.dat | 26/05/2016 | mietable_jpss_atms.dat |
| GMI | N | rtcoef_gpm_1_gmi.dat | 26/05/2016 | mietable_gpm_gmi.dat |
| HSB | N | rtcoef_eos_2_hsb.dat | 26/05/2016 | - |
| ICI*, ** | N | rtcoef_metopsg_1_ici.dat | 26/05/2016 | - |
| MADRAS | N | rtcoef_meghatr_1_madras.dat | 26/05/2016 | mietable_meghatr_madras.dat |
| MHS | N | rtcoef_noaa_xx_mhs.dat rtcoef_metop_x_mhs.dat | 24/05/2017*** | mietable_noaa_mhs.dat mietable_metop_mhs.dat |
| MSU | N | rtcoef_noaa_xx_msu.dat | 26/05/2016 | - |
| MTVZA-GY | N | rtcoef_meteor-m_2_mtvzagy.dat | 26/05/2016 | mietable_meteor-m_mtvzagy.dat |
| MWHS | N | rtcoef_fy3_1_mwhs.dat | 26/05/2016 | mietable_fy3_mwhs.dat |
| MWHS2 | N | rtcoef_fy3_3_mwhs2.dat | 10/08/2018 | mietable_fy3_mwhs2.dat |
| MWI | N | rtcoef_metopsg_1_mwi.dat | 26/05/2016 | mietable_metopsg_mwi.dat |
| MWR | N | rtcoef_ers_x_mwr.dat rtcoef_envisat_1_mwr.dat | 26/05/2016 | mietable_ers_mwr.dat mietable_envisat_mwr.dat |
| MWRI | N | rtcoef_fy3_1_mwri.dat rtcoef_fy3_3_mwri.dat | 26/05/2016 | mietable_fy3_mwri.dat |
| MWS** | N | rtcoef_metopsg_1_mws.dat | 26/05/2016 | mietable_metopsg_mws.dat |
| MWTS | N | rtcoef_fy3_1_mwts.dat | 26/05/2016 | mietable_fy3_mwts.dat |
| MWTS2 | N | rtcoef_fy3_3_mwts2.dat | 10/08/2018 | mietable_fy3_mwts2.dat |
| SAPHIR | N | rtcoef_meghatr_1_saphir.dat | 26/05/2016 | mietable_meghatr_saphir.dat |
| SMMR | N | rtcoef_nimbus_7_smmr.dat | 26/05/2016 | - |
| SSM/I | N | rtcoef_dmsp_xx_ssmi.dat | 26/05/2016 | mietable_dmsp_ssmi.dat |
| SSMIS | N | rtcoef_dmsp_xx_ssmis.dat | 26/05/2016 | mietable_dmsp_ssmis.dat |
| SSMIS Zeeman (83L) | Y | rtcoef_dmsp_xx_ssmis_zeeman.dat | 13/01/2011 | As above |
| SSM/T2 | N | rtcoef_dmsp_xx_ssmt2.dat | 26/05/2016 | - |
| TMI | N | rtcoef_trmm_1_tmi.dat | 26/05/2016 | mietable_trmm_tmi.dat |
| Windsat | N | rtcoef_coriolis_1_windsat.dat | 26/05/2016 | mietable_coriolis_windsat.dat |
* ICI coefficients are preliminary: channel specifications may change. Work is planned to validate the spectroscopic data used at frequencies above 200GHz.
** FASTEM and TELSEM have not been trained for frequencies above 200GHz and so should be used with caution for such channels: this applies to most ICI channels and MWS channel 24.
*** The AMSU-B and MHS coefficient files generated in May 2016 did not include band correction coefficients unlike previous versions of these files. The AMSU-B and MHS files in the tarball linked above now include the band correction coefficients (these files have been converted from their RTTOV v12 equivalents).
Coefficient regression limits
RTTOV coefficients are trained using a set of diverse profiles which cover a wide range of values for each atmospheric variable. The fast optical depth calculations can be expected to be accurate for input profiles which lie within the profile “envelopes” defined by the minimum and maximum values for each profile variable.
By default RTTOV checks the input profile against a set of profile regression limits: it can either warn if the regression limits are exceeded or clip the values to the limits where the limits are exceeded (if the apply_reg_limits option is set to TRUE). For some time it has been the practice in RTTOV to set the regression limits to +/-10% of the profile envelope for temperature and +/-20% of the profile envelope for each gas. For highly variable gases (such as water vapour) this may be reasonable, but for less variable gases (such as CO2) the limits should probably be less permissive. The aim is to address this for the next version of RTTOV.
The tables below show the current regression limits defined in the RTTOV coefficient files. This information is contained within each coefficient file.
Show/Hide the table of 54-level regression limits.
Show/Hide the table of 101-level regression limits.
Show/Hide the table of 51-level regression limits (SSU only).