Combine two different GeoAttrs (which must have the same cellsizes).
Compare this object with another GeoAttrs object, as per the comparison rules in Extent#compare.
Determine if the underlying extent contains the given point.
The map coordinate of a grid cell is the center point.
Convert map coordinate tuple (x,y) to grid coordinates (col,row).
Convert map coordinates (x,y) to grid coordinates (col,row).
The size of the extent, e.