{
 "layers": [
  {
   "layerId": 0,
   "layerName": "Signal",
   "layerType": "Feature Layer",
   "minScale": 0,
   "maxScale": 0,
   "legend": [
    {
     "label": "",
     "url": "063b6eafc4ff3a63a40f556a3c050bf7",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAiUlEQVQ4jWNhoDJgGTWQYsAybAxsgNIHoJgiAxt03WTrQYyXdz/Vv7r7sRHJApINdBBT5q/XcZMFc3QYGBiu7Hpcf3nXYwZchrIQMlBcmY+AEgoj5eXdTwz4wpGFgP4GkPdAYQdzKTQMyTYQBBpe3f144NXdjw5gHp4IIcXLBJPL8MspRIPBbyAAEiIpyjNw9l8AAAAASUVORK5CYII=",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20
    }
   ],
   "legendGroups": [
    {
     "id": "0",
     "heading": ""
    }
   ]
  }
 ]
}