{
 "layers": [
  {
   "layerId": 0,
   "layerName": "支流",
   "layerType": "Feature Layer",
   "minScale": 200000,
   "maxScale": 0,
   "legend": [
    {
     "label": "",
     "url": "27d77d245e2251fbb56e910ff719e074",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAOxAAADsQBlSsOGwAAACxJREFUOI1jYaAyYBk1cNTA4Wvgymf/qWJauBQjC4xBFQMZhk4Yjho4vA0EAJuLA8OH0jHRAAAAAElFTkSuQmCC",
     "contentType": "image/png",
     "height": 20,
     "width": 20
    }
   ]
  },
  {
   "layerId": 1,
   "layerName": "干流",
   "layerType": "Feature Layer",
   "minScale": 0,
   "maxScale": 0,
   "legend": [
    {
     "label": "",
     "url": "7793732fc2b5c90b791fc4e93f6aec77",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAOxAAADsQBlSsOGwAAADtJREFUOI1jYaAyYBk1cNRASgxc+ew/RSaFSzEiDKTUMJgZ4VKMNPJyuBQjdb2MJEApGErJZtTAQWMgAESXDMMFlF04AAAAAElFTkSuQmCC",
     "contentType": "image/png",
     "height": 20,
     "width": 20
    }
   ]
  },
  {
   "layerId": 2,
   "layerName": "面状河流",
   "layerType": "Feature Layer",
   "minScale": 0,
   "maxScale": 0,
   "legend": [
    {
     "label": "",
     "url": "1459c9c115c807c34b04591583a36654",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAOxAAADsQBlSsOGwAAADBJREFUOI1jYaAyYKGdgSuf/afYtHApRhq6cNTAUQNHDRw1cGgYGC7FiGogVIBSAAAueAQ18grT/wAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "height": 20,
     "width": 20
    }
   ]
  }
 ]
}