public function getIndex(MapRequest $request, $lat = null, $lng = null, $lat2 = null, $lng2 = null)
 {
     $pictures = collect([]);
     if ($lat2 === null) {
         $pictures = Picture::byGeoPoint($lat, $lng)->get();
     } else {
         $pictures = Picture::byBoundingBox($lat, $lng, $lat2, $lng2)->get();
     }
     return response((new PictureMapMapper($pictures))->getItems())->header('Content-Type', 'application/json')->header('Access-Control-Allow-Origin', '*')->header('Access-Control-Allow-Methods', 'GET')->header('Access-Control-Allow-Headers', 'Content-Type, X-Auth-Token, Origin');
 }