{
 "layers": [
  {
   "layerId": 0,
   "layerName": "已有监控点位缓存区",
   "layerType": "Feature Layer",
   "minScale": 0,
   "maxScale": 0,
   "legend": [
    {
     "label": "",
     "url": "00b0971823871fa83c65327776fee388",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAOxAAADsQBlSsOGwAAAEBJREFUOI1jYaAyYKGdga0r/lNsWnUEI6oLVezIN+zOIQYGBpp6edTAUQNHDRw1EKeB0CKILFAdwYhqIFSAUgAAhAUIl+btZc4AAAAASUVORK5CYII=",
     "contentType": "image/png",
     "height": 20,
     "width": 20
    }
   ]
  }
 ]
}