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Since version 4 all data are provided in Grid format the full table a table with the grid code definition can be found here.
ECMWF have also developed a series of resources in R and Python to help users access and process these data, the most notables are
The name caliver stands for CALIbration and VERification of forest fire gridded model outputs. This is a package developed for the R programming language and available under an APACHE-2 license from a public repository. Complete documentation, including a vignette, is also available within the package.
Jupyter notebooks to explore, visualise and post-process fire danger reanalysis and forecast data from the GEFF modelling system.