Wondering if is an easy and quick way to add colors to regions in a global map (matrix)?
Like this...(attached figure).
I would like to make a "mask map" with different numbers for the regions (colors) (e.g. South Pacific = 1, North Pacific = 2, etc) and then extract from a global map (matrix) the values for South Pacific = 1, North Pacific =2, etc.
In this case, the global map is a matrix with ocean temperature data.