{
 "layers": [
  {
   "layerId": 0,
   "layerName": "北京市街道乡镇界面",
   "layerType": "Feature Layer",
   "minScale": 0,
   "maxScale": 0,
   "legend": [
    {
     "label": "",
     "url": "0c898ab9da5b31ca98b2cd4e7858667a",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAOxAAADsQBlSsOGwAAAD1JREFUOI1jYaAyYKGlgf+pYB4jigtPfXpKtklmfNIMDAw09vKogaMGjho4aiB2A2FFEJmAEd1ARkpMgwEA0YAEskZwoVEAAAAASUVORK5CYII=",
     "contentType": "image/png",
     "height": 20,
     "width": 20
    }
   ]
  }
 ]
}