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Software

Error covariance

GRM-16 ROPP

GRM-92 GBGP

ROPP	ROPP Download

GRM-16: ROPP Software Deliverable

The Radio Occultation Processing Package (ROPP) is a package of software (as source code) and supporting build and test scripts, data files and documentation, which will aid users wishing to process, quality-control and assimilate radio occultation data from any radio occultation mission into NWP and other models. The current ROPP software version is ROPP-11.0. The actual release date for the ROPP-11.0 package is 26 January 2022, although the documentation and code are tagged with the nominal release date of 31 December 2021.

Users wishing to obtain the ROPP code will need to first register via the registration page and agree to the terms and conditions of the software licence. There is no charge for the package. Registered users should login and access the ROPP package from the download page.

ROPP documents

Before downloading the package it is recommended that users refer to the ROPP Release Notes and ROPP Overview document. The ROPP User Guide documents provides further information on each of the software modules.

• ROPP Software Licence
• ROPP Release Notes
• ROPP Software Changes
• ROPP Overview
• ROPP Utilities User Guide
• ROPP Input/Output module User Guide
• ROPP Pre-processor module User Guide
• ROPP Applications module User Guide
• ROPP Forward Model module User Guide
• ROPP 1DVAR module User Guide
• BUFR Template Specification for RO data
• Error Covariance Matrices

ROPP structure

Users may wish to integrate a subset of ROPP code into their own software applications, individually linking subroutines or modules to their own code. These users may not require the complete ROPP distribution package. Alternatively, users may wish to use the executable tools provided as part of each module as stand-alone applications for RO data processing. These users should download the complete ROPP release.

The ROPP software is split into several modules. The dependencies between modules are shown in the figure below. (Items new at ROPP-11.0 are in red.) Stand-alone executable tools are also provided with each module. The following modules are available:

ROPP_UTILS	Low-level utility routines (required by all other modules)
ROPP_IO	Support for file reading and writing, RO internal data structure and interfaces, BUFR encoder/decoder tools, profile thinning, file management.
ROPP_PP	Pre-processor to derive L1 and L2 channel bending angles from excess phase and amplitude, and to compute ionospheric corrected bending angle and refractivity profiles from L1 and L2 channel bending angles. 1D and 2D wave optics propagation codes.
ROPP_APPS	Tropopause height and planetary boundary layer height diagnostics.
ROPP_FM	1d and 2d forward models and associated tangent linear, adjoint and gradient codes.
ROPP_1DVAR	1d-Var retrieval and minimizer code for variational assimilation of refractivity, bending angle or the difference between bending angles at two frequencies, in background atmospheric or ionospheric states.