Radio Occultation Meteorology

The ROM SAF generates and archives high-quality GPS Radio Occultation (RO) datasets for Numerical Weather Prediction (NWP) applications and specific climate application areas.

SAF Official Service Name

Satellite Application Facility on Radio Occultation Meteorology (ROM SAF)

Radio Occultation Meteorology SAF

SAF Objectives

The ROM SAF generates and archives high-quality GPS Radio Occultation (RO) datasets for Numerical Weather Prediction (NWP) applications and specific climate application areas, through the exploitation of satellite measurements with state-of-the-art algorithms, to derive information about the atmosphere and climate variables of the Earth system. The ROM SAF is also engaged in developing an RO processing software package containing modules for assimilation of RO data in NWP models.

The activities encompass continued developments of the processing algorithms, in order to enhance the information of atmosphere variables and for improving the products. Raw GPS radio occultation data are calibration-free, with known assumptions, and are also well-suited for climate investigations and monitoring. The applications cover construction of an accurate single-source climate database with known error characteristics of the data.

SAF Leader and Consortium


Leading Entity
Danmarks Meteorologiske Institut (DMI), Denmark

Consortium Members
ECMWF, UK
Institut d'Estudis Espacials de Catalunya, Spain
Met Office, UK

SAF Phases

Development Phase: April 1999–March 2004
Extended Development Phase: April 2004–February 2007
Continuous Development and Operations Phase: March 2007–February 2012
Second Continuous Development and Operations Phase: March 2012–February 2017
Third Continuous Development and Operations Phase: March 2017–February 2022

SAF input satellite data

  • Metop (GRAS)
  • COSMIC (BlackJack)
  • CHAMP (BlackJack)

SAF products

Products are accessible on local FTP servers with flexible extraction interface, EUMETCast, and the EUMETSAT Data Centre. See the Product Navigator for detailed information on the ROM SAF products.

SAF topology and architecture

The ROM SAF maintains one operations centre at DMI, which produces in an operational mode the NRT, offline products and climatological datasets.

To ensure that offline time series are long, homogeneous and state-of-the-art, archived satellite data will be reprocessed in stand-alone events.

Software and archived products can be obtained from the Radio Occultation Meteorology SAF.

SAF user community

National Weather Services, Forecasters, Climate Researchers, Climate Modellers.