code: def write(self, directory, name=None, session=None, replaceParamFile=None):
          
  
          # Initiate file
          if name != None:
              filename = '%s.%s' % (name, self.fileExtension)
              filePath = os.path.join(directory, filename)
          else:
              filePath = os.path.join(directory, self.filename)
  
          # If the raster field is not empty, write from this field
          if type(self.raster) != type(None):
              # Configure RasterConverter
              converter = RasterConverter(session)
  
              # Use MapKit RasterConverter to retrieve the raster as a GRASS ASCII Grid
              grassAsciiGrid = converter.getAsGrassAsciiRaster(rasterFieldName='raster',
                                                               tableName=self.__tablename__,
                                                               rasterIdFieldName='id',
                                                               rasterId=self.id)
  
              # Write to file
              with open(filePath, 'w') as mapFile:
                  mapFile.write(grassAsciiGrid)
  
          else:
              if self.rasterText is not None:
                  # Open file and write, raster_text only
                  with open(filePath, 'w') as mapFile:
                      mapFile.write(self.rasterText)
docs: Index Map Write to File Method