Creates the spatial grid that is used by mapspamc to allocate physical area shares
for each crop and system. The border of the country is used as mask to
determine the grid and each grid cell is given a gridID number.
create_grid(param = NULL)Object of type mapspamc_par that bundles all mapspamc parameters,
including core model folders, alpha-3 country code, year, spatial
resolution, most detailed level at which subnational statistics are
available, administrative unit level at which the model is solved and type of
model.
For technical reasons, gridID values are set before the raster is masked with
the country border, which means they are unique but non consecutive. Note that
grids at a resolution of 30 arcsec can become very large and might make some
time to create. The file is saved in /processed_data/maps/{resolution}/grid
if (FALSE) {
create_grid(param)
}