{
 "layers": [
  {
   "layerId": 0,
   "layerName": "PM_2_5",
   "layerType": "Feature Layer",
   "minScale": 0,
   "maxScale": 0,
   "legend": [
    {
     "label": "",
     "url": "3603c73102e995de4f3391d240b0b9d3",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAASklEQVQ4jWMpKszfzsTE5MBABfDv378DLExMTA4d1a4c1DCwonW3Aws1DEIGowaOGjhq4KiBowZCDfz379+BitbdDtQw7N+/fwcAld4TVNesWOIAAAAASUVORK5CYII=",
     "contentType": "image/png",
     "height": 20,
     "width": 20
    }
   ]
  }
 ]
}