docs: def _get_ned_sources_needing_metadata(
              self):
          """*Get the names of 50000 or less NED sources that still require metabase in the database*
  
          **Return:**
              - ``len(self.theseIds)`` -- the number of NED IDs returned
  
          *Usage:*
  
              .. code-block:: python
  
                  numberSources = stream._get_ned_sources_needing_metadata()
          """
          self.log.debug(
              'starting the ``_get_ned_sources_needing_metadata`` method')
  
          tableName = self.dbTableName
  
          # SELECT THE DATA FROM NED TABLE
          sqlQuery = u"""
              select ned_name from %(tableName)s where raDeg is null and (download_error != 1 or download_error is null) limit 50000;
          """ % locals()
          rows = readquery(
              log=self.log,
              sqlQuery=sqlQuery,
              dbConn=self.cataloguesDbConn,
              quiet=False
          )
  
          self.theseIds = []
          self.theseIds[:] = [r["ned_name"] for r in rows]
  
          self.log.debug(
              'completed the ``_get_ned_sources_needing_metadata`` method')
  
          return len(self.theseIds)