{
 "layers": [
  {
   "layerId": 0,
   "layerName": "Street Pavement",
   "layerType": "Feature Layer",
   "minScale": 0,
   "maxScale": 0,
   "legend": [
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     "height": 20,
     "width": 20,
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     ]
    },
    {
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     "url": "a083940710cd09aaaf920ee15c280987",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAT0lEQVQ4jWMpq+hsYWbidGCgAvj77/sBFpBhYrKB1tQw8NXj9QwsDFQGLKMGUgxYKDcCFYwaSDlgoYIZKGDUwBERhn//fT8AKmmpAUBmAQAiOxO1lATsAwAAAABJRU5ErkJggg==",
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    },
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    },
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     "height": 20,
     "width": 20,
     "values": [
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     ]
    },
    {
     "label": "Street, Paved",
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     "height": 20,
     "width": 20,
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     ]
    },
    {
     "label": "<all other values>",
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     "height": 20,
     "width": 20
    }
   ],
   "legendGroups": [
    {
     "id": "0",
     "heading": "Use, Surface Type"
    },
    {
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    }
   ]
  }
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}