/**
  *  save the neighborhood polygon
  *
  **/
 public function saveNeighborhoodBoundary($neighborhood, $polygon, $ups)
 {
     $neighborhoodPolygon = NeighborhoodBoundary::build(array('geom' => $polygon, 'neighborhood' => $neighborhood, 'user_polygons' => $ups, 'grid_resolution' => $this->getGridResolution()));
     $this->m()->neighborhoodPolygonMapper()->save($neighborhoodPolygon);
     return $neighborhoodPolygon;
 }