code: def is_uswest_source(self):
          
          return not SHConfig().is_eocloud_ogc_url() and self.value[0] in [_Source.LANDSAT8, _Source.MODIS, _Source.DEM]
docs: Checks if data source via Sentinel Hub services is available at US West server
  
          Example: ``DataSource.LANDSAT8.is_uswest_source()`` or ``DataSource.is_uswest_source(DataSource.LANDSAT8)``
  
          :param self: One of the supported data sources
          :type self: DataSource
          :return: ``True`` if data source exists at US West server and ``False`` otherwise
          :rtype: bool