{
 "layers": [
  {
   "layerId": 0,
   "layerName": "ZCTA_Data_Processed",
   "layerType": "Feature Layer",
   "minScale": 0,
   "maxScale": 0,
   "legend": [
    {
     "label": "No significant loss in luminosity",
     "url": "a454fbf47323feecff1b214c0fa64c4e",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAQklEQVQ4je3MQRHAQAgDwJBBGM7OGi4qow5CP32cAJ5ZAZvzPiWwsIBQp8CKwNkINURuRDeHDh06dPiHhFrDlYxQf56tD5W0ob6yAAAAAElFTkSuQmCC",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20,
     "values": [
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    },
    {
     "label": "0-25%  loss in luminosity",
     "url": "8caed1e0b535dbc263bb4ec613a87902",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAARElEQVQ4je3MMQ0AMQwDQNcKsDB7ACWVvZAquV1+KICMPgAXe80klGggsIJQYoyvI+QRoiN6OXTo0KHDPxRYPGrJBNYFv6YPIQN4JVcAAAAASUVORK5CYII=",
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     "groupId": "0",
     "height": 20,
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     "values": [
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    {
     "label": "25-50% loss in luminosity",
     "url": "26349d0ba85256dbbc59eb8227e684c2",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAQ0lEQVQ4je3MQQ3AMAwDQM8KsMAomwEoqfCq5OxVaQDy9AG4OHslyMQEqQJkPuh34msSMRH9OXTo0KHDG0rV5Mwm1QcRaA6w5/vlEAAAAABJRU5ErkJggg==",
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     "groupId": "0",
     "height": 20,
     "width": 20,
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    },
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     "label": "50-75% loss in luminosity",
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     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAQUlEQVQ4jWN57GPiwPCPwYGBGoCJ4QALxLD/9VQx8B8jAwtVDEICowaOGjhq4KiBowbCDGRiOMDwj5E6pjExHAAAZgwKMkmHqPgAAAAASUVORK5CYII=",
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     "groupId": "0",
     "height": 20,
     "width": 20,
     "values": [
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     ]
    },
    {
     "label": "75%+ loss in luminosity",
     "url": "e575d520bd0f83b79408282ab4e7b80b",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAMElEQVQ4jWPZzMDgwADB1AAHWKCG1VPJQAYWahk0auCogaMGjho4aiCmgQeoaN4BANjpBIPaOQ4BAAAAAElFTkSuQmCC",
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     "groupId": "0",
     "height": 20,
     "width": 20,
     "values": [
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    },
    {
     "label": "No data",
     "url": "c753ed224c695cd1e9c9d6e6437d411d",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAP0lEQVQ4je3MMREAQQgEwWMLYTi7AGMom/rkgxNAuC2gs7sLqLNA0iRQEXE3QuDkRvRy6NChQ4d/KGmAlUzSfNtzEVYLiI1+AAAAAElFTkSuQmCC",
     "contentType": "image/png",
     "groupId": "1",
     "height": 20,
     "width": 20
    }
   ],
   "legendGroups": [
    {
     "id": "0",
     "heading": "difference"
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}