{
 "layers": [
  {
   "layerId": 0,
   "layerName": "遮罩",
   "layerType": "Feature Layer",
   "minScale": 0,
   "maxScale": 0,
   "legend": [
    {
     "label": "",
     "url": "090a79a511faf3273b0c5505d6fc81ac",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAOxAAADsQBlSsOGwAAADFJREFUOI1jYaAyYKGZgZs3b/5PiUG+vr6MKAZSC4waOGrgqIGjBtLZQFh5RjUDqQUA/zMFOSXeKtcAAAAASUVORK5CYII=",
     "contentType": "image/png",
     "height": 20,
     "width": 20
    }
   ]
  }
 ]
}