{
 "layers": [
  {
   "layerId": 4,
   "layerName": "RoadCenterlines",
   "layerType": "Feature Layer",
   "minScale": 0,
   "maxScale": 0,
   "legend": [
    {
     "label": "Roads",
     "url": "81539e7f8b9d684c55082b95ad9b6561",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAMklEQVQ4jWNhoDJgGTWQYsBCuRGoYAQb+J9K5jHSzIWM1DaQaoCFekZBwKiBlIPBH4YAheEBUjQUfpwAAAAASUVORK5CYII=",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20
    }
   ],
   "legendGroups": [
    {
     "id": "0",
     "heading": ""
    }
   ]
  },
  {
   "layerId": 3,
   "layerName": "Railroads",
   "layerType": "Feature Layer",
   "minScale": 0,
   "maxScale": 0,
   "legend": [
    {
     "label": "Railroads",
     "url": "fadab733e3b65c36a18f5c80eb5837dd",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAR0lEQVQ4jWNhoDJgGTWQ7mHYgEZTbKD98Irl/USod8Cj1hHdQKoAFnQbCID9hNSyUO6mQWbgQWob2EBtAwkCFsJKSAOD30AAoaQGEZ4P/3cAAAAASUVORK5CYII=",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20
    }
   ],
   "legendGroups": [
    {
     "id": "0",
     "heading": ""
    }
   ]
  },
  {
   "layerId": 2,
   "layerName": "Bridges",
   "layerType": "Feature Layer",
   "minScale": 0,
   "maxScale": 0,
   "legend": [
    {
     "label": "Bridges",
     "url": "2706cf82f2812c491450f1076003d5bc",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAQ0lEQVQ4jWNhoDJgGTWQYsBCuRGoYKQa2NjY2MDExGRPiUH//v07WF9f30AbF9bX1zdQ1UBqAhaqmsYwaiA1wOCPFADEmwpOOTfaCgAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20
    }
   ],
   "legendGroups": [
    {
     "id": "0",
     "heading": ""
    }
   ]
  },
  {
   "layerId": 1,
   "layerName": "Airstrips",
   "layerType": "Feature Layer",
   "minScale": 0,
   "maxScale": 0,
   "legend": [
    {
     "label": "Airstrips",
     "url": "574f7244648e17256d49272d5d3f8cb8",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAb0lEQVQ4je3SsQ2AIBBG4QfeBIxg3ANapjJORSt7ICOwgWKc4ejwJdd+xZ8TBic/qE4mBFNKwWKDwXgtdnMfsrDs67YG55wKa61xlStLp2cgMCCD8fLwnLVUX6kqrNPzZ0mM8QS+m+Vt+EFtwzd8AcRrH5+XvUAmAAAAAElFTkSuQmCC",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20
    }
   ],
   "legendGroups": [
    {
     "id": "0",
     "heading": ""
    }
   ]
  }
 ]
}