code: def _get_proj4_name(self, projection):
          
          gmap_name = projection.attrs['grid_mapping_name']
          proj = {
              'geostationary': 'geos',
              'lambert_conformal_conic': 'lcc',
              'polar_stereographic': 'stere',
              'mercator': 'merc',
          }.get(gmap_name, gmap_name)
          return proj
docs: Map CF projection name to PROJ.4 name.