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RTTOV v10 resources

Version 10 of RTTOV was first released in January 2011 with an update v10.2 released in January 2012. Users are advised that this version of RTTOV has now been superseded by RTTOV v11 which should be used in preference to RTTOV v10.

RTTOV v10.2:

RTTOV v10.2 is no longer made available to users by the NWP SAF. It is recommended that users upgrade to the latest version of RTTOV which has improved features and accuracy.

Users of v10.1 can download updated code and files here. This package includes updated source code, test files, test reference data, and documentation. Note that the latest coefficient files are not included and should be downloaded separately (available below). The readme file contains instructions on how to apply the update which are repeated here:

Copy your RTTOV v10.1 directory. For example:

$ cp -r ~user/rttov10 ~user/rttov102

Remove some files which are no longer needed:

$ cd ~user/rttov102
$ rm -f src/main/rttov_integrate.F90
$ rm -f src/main/*fastem4*
$ rm -fr rttov_test/*

Copy the file rttov102_update.tar.gz into this new top-level RTTOV v10.2 directory, and extract the updates:

$ tar -zxf rttov102_update.tar.gz

The process for compiling the code and running the test suite remains the same as for v10.1. The test reference data has been generated using the new coefficients available below.


RTTOV v10 documentation:
RTTOV v10 known bugs and code updates
Please report any bugs you find in RTTOV v10 using the NWP SAF Feedback Form.
  • 2012-04-11: Several minor bugs/issues have been found since the RTTOV v10.2 release. An update is available which addresses these issues. The update is particularly recommended for all RTTOV v10.2 users who:
    • run RTTOV in a parallelized implementation other than with OpenMP
    • run shortwave IR solar simulations
    • use the IR emissivity atlas.
    This readme details the fixes/changes, how to apply them, and lists the contents of the update tarball. The update is available here.
All bugs listed below pertain to RTTOV v10.1 and are fixed in RTTOV v10.2:
  • 2011-10-28: Where optional trace gas profiles are omitted from the input profile, certain predictors are computed using the reference temperature profile instead of the input temperature profile. This is not the intended behaviour for RTTOV and the relevant source files have been modified to correct this. The updated files (rttov_setpredictors*.F90) are available as a gzipped tarball which should be unzipped/untarred in the src/main/ directory. Note that this change has a negligible impact on the tests included in the user test suite as all of those profiles include all trace gases. Therefore the existing test reference data is still valid. Updates available here.
  • 2011-10-28: A modification to rttov_coeffname.F90 is required to enable the use of sat_id 0 for NPP instrument coefficient files (ATMS, CrIS and VIIRS). The modified file should be unzipped in the src/coef_io/ directory. Update available here.
  • 2011-07-26: Updated reference data for the test suite for the updates/bug fixes below is available here. The file should be unzipped/untarred in the rttov_test/ directory.
  • 2011-07-22: In the original MHS coefficients for NOAA-18 and NOAA-19 (but not metop-2), there was an error in the central frequencies and in the fundamental constants. This is corrected in the new files: NOAA-18, NOAA-19.
  • 2011-02-01: There is an error in the Windsat coefficient file supplied with the RTTOV v10_1 distribution. The following file should replace the copy in rtcoef_rttov10/rttov7pred51L/, and note that this will result in the test suite reporting differences against the test reference data for Windsat: Windsat RTTOV coeffs
  • 2011-02-01: If compiling RTTOV v10_1 with ifort version 11, erroneous results can occur if the highest level of optimisation (-O3) is used for the routines rttov_setpredictors_8_ad.F90 and rttov_setpredictors_9_ad.F90. To avoid this, use the build flags in the following file, which should be placed in build/arch/: ifort v11 build flags

RTTOV v10 FAQs
Please see the Frequently Asked Questions page.


RTTOV v10 coefficients files:

Note that most RTTOV v11 coefficient files can be used with RTTOV v10 and those are the recommended files to use with RTTOV v10. The RTTOV v11 coefficients page includes notes on which files are compatible with v10.

Coefficient files for most sensors are included with the source code distribution. Additional larger coefficient files are available separately below. Note that RTTOV v10 uses a slightly different header format for coefficient files to previous versions of RTTOV, so that old RTTOV coefficient files are not directly compatible with RTTOV v10 (though it is possible to convert old coefficient files using software supplied in the distribution).

Optical depth predictors for high resolution IR sounders based on LBLRTMv12.1:

The following files should be unzipped in rtcoef_rttov10/rttov7pred51L/:
  • AIRS RTTOV coeffs on 51L mixed gases, H2O and O3 (bzipped 15 MB) (for faster computations but less accurate) Updated 2012-01-17
  • Metop-A IASI RTTOV coeffs on 51L mixed gases, H2O and O3 (bzipped 53 MB) (for faster computations but less accurate) Updated 2012-01-17
  • Metop-B IASI RTTOV coeffs on 51L mixed gases, H2O and O3 (bzipped 53 MB) (for faster computations but less accurate) New 2012-09-19
  • CrIS RTTOV coeffs on 51L mixed gases, H2O and O3 (bzipped 8 MB) (for faster computations but less accurate) Updated 2012-01-17
The following files should be unzipped in rtcoef_rttov10/rttov7pred101L/:
  • AIRS RTTOV coeffs on 101L mixed gases, H2O and O3 (bzipped 29 MB) (for faster computations but less accurate) Updated 2012-01-17
  • Metop-A IASI RTTOV coeffs on 101L mixed gases, H2O and O3 (bzipped 104 MB) (for faster computations but less accurate) Updated 2012-01-17
  • Metop-B IASI RTTOV coeffs on 101L mixed gases, H2O and O3 (bzipped 104 MB) (for faster computations but less accurate) New 2012-09-19
  • CrIS RTTOV coeffs on 101L mixed gases, H2O and O3 (bzipped 17 MB) (for faster computations but less accurate) Updated 2012-01-17

Optical depth predictors for high resolution IR sounders based on LBLRTMv11.1:

The following files should be unzipped in rtcoef_rttov10/rttov9pred101L/:

Optical depth predictors for infrared imagers and sounders based on LBLRTMv12.1 on 51L:

The following files should be unzipped/untarred in rtcoef_rttov10/rttov7pred51L/:

Optical depth predictors for microwave imagers and sounders based on Liebe 89/92 on 51L:

The following files should be unzipped/untarred in rtcoef_rttov10/rttov7pred51L/:

IASI & AIRS Principal Components coefficient files:

The following files should be unzipped in rtcoef_rttov10/pc/:

Infrared cloud scattering coefficient files:

The following files should be unzipped/untarred in rtcoef_rttov10/cldaer/:

Infrared aerosol scattering coefficient files:

The following files should be unzipped/untarred in rtcoef_rttov10/cldaer/:

RTTOV_SCATT microwave scattering coefficient files: All updated 2012-01-17

The following files should be unzipped in rtcoef_rttov10/mietable/:

Surface emissivity atlas data:

The following files should be unzipped/untarred in emis_data/: