{
 "layers": [
  {
   "layerId": 0,
   "layerName": "塌陷点",
   "layerType": "Feature Layer",
   "minScale": 0,
   "maxScale": 0,
   "legend": [
    {
     "label": "",
     "url": "139f16fba93f15adbc80f06481d723f8",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAjElEQVQ4je3QzQ2AIAwF4HdwBF3BqFM4gEf3Ke7DkQGYopquAEN4QWNiRPw58hJCmjQfpQV+TpHBDO5R4bbhfALVMLYEAMKOhP10eOAx2NddScPYhLKB0QsZPeMKTQCrm5Zn4CnCDojs8Q5URs8QdrRNGnb4GgQAJeytsO+3Otac+mUbm+oNmJwMfs8KeaYpHEgPZpcAAAAASUVORK5CYII=",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20
    }
   ],
   "legendGroups": [
    {
     "id": "0",
     "heading": ""
    }
   ]
  }
 ]
}