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What is GRIB?

GRIB (GRIdded Binary or General Regularly-distributed Information in Binary form) is a common data format used in meteorology and standardised by the World Meteorological Organisation.

  • There are two versions of GRIB: GRIB edition 1 (GRIB1) and edition 2 (GRIB2).
  • CEMS-Flood data is available in GRIB2

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  • It is archieved in GRIB2 in the Meteorological Archival and Retrieval System

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Working with GRIB2 files

There are 2 principal ways to work with GRIB2 files:

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  1. ecCodes

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library developed at ECMWF consisting of a set of tools to code and decode GRIBs,

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as well as other formats. The eccodes command-line utilities are commonly used by the meteorology community. Please consult the Copernicus Knowledge Base page How to read GRIB files for an overview of the commands available.

  1. CFGRIB

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A Python interface to the eccodes library. It is one of the supported backends of Xarray.

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Please consult the Open CEMS-Flood data page for

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example of using CFGRIB with CEMS-Flood data.