code: def _geograins(self):
          
  
          from geoid.civick import GVid
  
          geo_grains = {}
  
          for sl, cls in GVid.sl_map.items():
              if '_' not in cls.level:
                  geo_grains[self.stem(cls.level)] = str(cls.nullval().summarize())
  
          return geo_grains
docs: Create a map geographic area terms to the geo grain GVid values