Gridspec

A gridspec describes spatial grids in the form a dict. Its specification is yet to be finalised. However, at the moment, only the grid key has to be used for the source and target grids earthkit-regrid supports.

The grids supported by earthkit-regrid and their gridspecs are summarised below:

global octahedral reduced gaussian grid

The grid format is:

OXXX

where XXX is the number of latitude lines between the pole and equator. For details about this grid, see here.

Example:

{"grid": "O320"}

global (non-octahedral) reduced gaussian grid

The grid format is:

NXXX

where XXX is the number of latitude lines between the pole and equator. For details about this grid, see here.

Example:

{"grid": "N320"}

global regular latitude-longitude grid

The grid format is:

[DLON, DLAT]

where DLON and DLAT are the increments in degrees in longitudes and latitudes, respectively. This grid definition uses the default scanning mode used at ECMWF: values start at North-West and follow in consecutive rows from West to East, where West is always the 0° meridian.

Example:

{"grid": [1, 1]}