def _write(self, session, openFile, replaceParamFile):
        """
        Raster Map File Write to File Method
        """
        # If the raster field is not empty, write from this field
        if self.raster is not 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
            openFile.write(grassAsciiGrid)

        elif self.rasterText is not None:
            # Write file
            openFile.write(self.rasterText)