RTTOV Downloads


You must be signed in and must have agreed to the NWPSAF software licence in order to download this software.If you haven’t yet done so, please register on the site. Software subscriptions can be managed in the user area by clicking ‘Change Software Preferences’.

Archived versions of RTTOV

Archived versions of software package downloads are now managed in the user area.
Please note that support is no longer provided for many archived versions of our software.


Coefficient files for most non-hyperspectral sensors are included with the source code distribution. Additional larger coefficient files are available on this page which provides a comprehensive list of the latest RTTOV coefficient files along with the features supported by each one. Use these tables to determine the best coefficient file(s) to use for your instrument(s) of interest.

HT-FRTC training data / sensor data

A set of training data suitable for comparison with RTTOV v7 predictors has been provided for user testing.
It has Water Vapour and Ozone as variable gases.
It covers 550-2900 wavenumbers so is sufficient for IASI for which a sensor file is provided.
The file is necessary for the operation of HT-FRTC with RTTOV (including running the tests included as part of the RTTOV v12 package).
Future training datasets and sensor specification files will be made available here.

HTFRTC Training Data

Emissivity / BRDF atlas data

Surface emissivity atlas data

The IR emissivity atlas angular correction and covariance files are optional and can be downloaded separately from the emissivity data itself.

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

Surface BRDF atlas data

The following file should be unzipped/untarred in brdf_data/:

Additional sources of surface emissivity data

Additional sources of emissivity data for RTTOV users are detailed on this page