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CEMS-Flood data are available in the following formats:
GRIB2
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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.
- It is archieved in GRIB2 in the Meteorological Archival and Retrieval System (MARS) at ECMWF, see the MARS user documentation for further information.
- Further information on the data format is available in the What are GRIB files page on the Copernicus Knowledge Base.
Working with GRIB2 files
There are 2 principal ways to work with GRIB2 files:
1. ecCodes
A library developed at ECMWF consisting of a set of tools to code and decode GRIBs, 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.
2. CFGRIB
A Python interface to the eccodes library. It is one of the supported backends of Xarray. Please consult the Open CEMS-Flood data page for example of using CFGRIB with CEMS-Flood data.
NetCDF4
The Network Common Data Format (NetCDF), is a machine-independent data format widely used in the scientific community to store array-oriented multi-dimensional data. CEMS-Flood datasets are conformant with the version 4 data model (NetCDF-4) and Version 1.7 of the CF convention.
Data format:
Data formats availability
GRIB2 is the official supported format, however, NetCDF4 is also supported for some of the datasets (see Table 1). More information on the two formats can be found in the GRIB2 and NetCDF4 sections.
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