Version 5.20 Updates

Version 5.20.0

• Externally released on 2023-10-04

• Installed as part of ecmwf-toolbox/2023.10.0.0 (Atos HPC)

• At ECMWF:

  • Installed 2023-10-03

  • Built with Magics 4.14.2

  • Built with ecCodes 2.32.0

  • Built with ODC version 1.4.6

HEALPix support

• with the latest versions of ecCodes, MIR and Atlas, Metview now supports the HEALPix grid, including:

  • conversion to Geopoints (grib_to_geo())

  • regridding from HEALPix to other grids (regrid())

  • extraction of latitudes and longitudes (latitudes(), longitudes())

  • nearest_gridpoint()

In order to plot a GRIB file with data in HEALPix grid, it is suggested to convert to Geopoints, and plot the result with Symbol Plotting (msymb()).

Fixes:

• regrid(): fixed issue when regridding wind components (e.g. U/V) to a regular lat/lon grid; the values at the poles now vary as if in a ring, in conformance with the WMO standard

• regrid(): fixed performance issue when processing ORCA grids from GRIB

• nearest_gridpoint(): fixed issue when the input is one of: Lambert Azimuthal Equal Area, Mercator, HEALPix

• flextra_run(): fixed issue where it could pick up the definition files of a different ecCodes from the one that FLEXTRA was built with