{
 "layers": [
  {
   "layerId": 1,
   "layerName": "Census Districts 2018",
   "layerType": "Feature Layer",
   "minScale": 0,
   "maxScale": 0,
   "legend": [
    {
     "label": "",
     "url": "644d7acc42327f6b4a8760d1afd29b89",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAASElEQVQ4jWMpZvDdwsDAYMNAHXCEBWQYI8P/AGqY9p+BcQPIQKoCllEDKQYslBuBCkYNpBywUMEMFDBq4EgJwyOgkpZK5h0BAPIZCTk3+WOhAAAAAElFTkSuQmCC",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20
    }
   ],
   "legendGroups": [
    {
     "id": "0",
     "heading": ""
    }
   ]
  },
  {
   "layerId": 2,
   "layerName": "Census Districts 2015",
   "layerType": "Feature Layer",
   "minScale": 0,
   "maxScale": 0,
   "legend": [
    {
     "label": "",
     "url": "718077caf63c9ff614431990f4ee23fd",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAT0lEQVQ4jWN5xrByCyMDow0DFcB/hv9HWECGSTBIBlDDwBcMzzewMFAZsIwaSDFgodwIVDBqIOWAhQpmoIBRA0dEGP5n+H8EVNJSwzCQWQDM6hDVcqqIVQAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20
    }
   ],
   "legendGroups": [
    {
     "id": "0",
     "heading": ""
    }
   ]
  },
  {
   "layerId": 3,
   "layerName": "Census Districts 2007",
   "layerType": "Feature Layer",
   "minScale": 0,
   "maxScale": 0,
   "legend": [
    {
     "label": "",
     "url": "bcf45fefe7026d89ead46dbbf38c5a21",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAATUlEQVQ4jWP5X3xvCwMjow0DNcD//0dYwIZ5cwRQxcCtPzawMFAZsIwaSDFgodwIVDBqIOWAhQpmoIBRA0dGGP7/fwRU0lLFtP//jwAAi40RdFxNQuYAAAAASUVORK5CYII=",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20
    }
   ],
   "legendGroups": [
    {
     "id": "0",
     "heading": ""
    }
   ]
  }
 ]
}