Add function to load Earth relief data #156
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Implements the function
load_earth_reliefingmt.datasetsto loadthe Earth relief grids distributed with GMT (the
@earth_relief_XXmspecial file names). Uses
gmt.whichto download to the user directoryand get the file name. The netCDF grid is loaded and returned as an
xarray.DataArray. Only support the 60 to 1 arc-minute global grids.
Higher resolution arc-second grids are served as tiles and are usually
cut to a specific area, so a
regionargument will be needed to loadthese grids later, probably in conjunction with
gmt.grdcut.