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GRAS SAF Software Deliverables

The Radio Occultation Processing Package (ROPP) aims to provide users with a comprehensive software solution for pre-processing Radio Occultation (RO) data from CGS Level 1b files or GRAS SAF Level 2 files. ROPP will feature RO-specific components to aid data assimilation in Numerical Weather Prediction (NWP) systems. It will consist of library functions and example applications in Fortran90, allowing users to customize components to suit local infrastructure. The package will be released in phases, beginning with a beta-testing program to collect user feedback.

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GRAS SAF Software Deliverables

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  1. GRAS SAF Software Deliverables Sean Healy Dave Offiler Christian Marquardt

  2. Radio Occultation Processing Package - ROPP Objective: To provide Users with a comprehensive software package, containing all necessary functionality to pre-process RO data from CGS Level 1b files or GRAS SAF Level 2 files, plus RO-specific components to assist with the assimilation of these data in NWP systems.

  3. ROPP Strategy (1) • ROPP functionality will mirror aspects of the GRAS SAF operational data production chain, but will not be the same code. • Level 1b->Level 2 algorithms will be similar but not necessarily identical to those in the GRAS SAF operational processor. • Bit-compatibility between GRAS SAF Level 2 data and ROPP-processed equivalents is not to be expected.

  4. ROPP Strategy (2) • ROPP will not be a“black box” • It will be a suite of library functions and example applications (Fortran90 source code) for users to “pick’n’mix” • Users may modify or replace components in ROPP to suit existing local operational infrastructure • ROPP will be delivered in phases with a beta-testing programme involving interested users.

  5. ROPP Main Functions (1) • Ingest (Level 1b UT and Level 2 SAF & BUFR) • Pre-filtering / smoothing / interpolation • Co-ordinate transformations • Meteorological conversions • Date/time conversions • Forward operators (incl. Adjoints, T/Linear, Gradients)

  6. ROPP Main Functions (2) • 1-DVAR example implementation • Observation covariance matrix • Standalone test harnesses (incl. test input and example output files) • Full User Documentation

  7. ROPP Development • First release planned for Q1 2004, but with limited functionality (e.g. forward operators for Refractivity only) • Updated package with added and/or improved functionality to be released incrementally (schedule to be defined depending on user priorities) • Beta-testing programme foreseen - volunteers?

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