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]}