ROPP

This is the feature request, issue and bug tracking web site for the Radio Occultation Processing Package (ROPP). ROPP is a sofware package designed to assist NWP users to assimilate radio occultation data from any RO mission such as GRAS, COSMIC, CHAMP or GRACE-A. The package is being developed through the EUMETSAT GRAS SAF.

The ROPP deliverable source code is sub-divided into modules:

• ropp_tools : low-level utility routines
• ropp_io : I/O support for RO data in netCDF and BUFR files
• ropp_pp : pre-processor (e.g. to derive refractivity profiles from bending angle profiles)
• ropp_qc : quality control routines
• ropp_fm : forward models (and associated tangent linear, adjoint & gradient code)
• ropp_1dvar : 1D-Var retrieval & minimiser

Collectively, these modules are knowns as ropp_src. Not all of these modules have been implemented for the first release (ROPP-1), but will be added for later releases.

Further information on ROPP is available from the ​GRAS-SAF.

The ROPP Repository

The whole ROPP development system is divided into three areas:

• ropp_src : deliverable code & supporting development system
• ropp_doc : user and project documentation
• ropp_test : Test Folder (test system and its results)

The repository for ROPP can be accessed via the Subversion server at the URL

https://svn.grassaf.org/ropp/

For instructions on how to access the ROPP repository (authorised users only) see the ​instructions for developers.