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  {
   "layerId": 0,
   "layerName": "urban development (year of growth)",
   "layerType": "Feature-Layer",
   "minScale": 5000000,
   "maxScale": 0,
   "legend": [
    {
     "label": "1541 - 1880",
     "url": "111edb142e336634c4fa6c4e64b9c327",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAOxAAADsQBlSsOGwAAAEZJREFUOI1jYaAyYKGZgTk5Of8pNWzKlCmMKC6cvGMK2YbleuQwMDDQ0sujBo4aOGrgqIE4DYQVQeSAKVOmMKIYCBOgFAAAqvgL7JpJupgAAAAASUVORK5CYII=",
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     "height": 20,
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     "values": [
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    },
    {
     "label": "1881 - 1900",
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     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAOxAAADsQBlSsOGwAAAEZJREFUOI1jYaAyYKGZgTk5Of8pNWzKlCmMKC6czDOFbMNyv+QwMDDQ0sujBo4aOGrgqIE4DYQVQeSAKVOmMKIYCBOgFAAA5hgMmMIyfrsAAAAASUVORK5CYII=",
     "contentType": "image/png",
     "height": 20,
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     "values": [
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     "label": "1901 - 1920",
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     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAOxAAADsQBlSsOGwAAAEZJREFUOI1jYaAyYKGZgTk5Of8pNWzKlCmMKC6c7D+FbMNyN+YwMDDQ0sujBo4aOGrgqIE4DYQVQeSAKVOmMKIYCBOgFAAAzxAMVd+0XZ4AAAAASUVORK5CYII=",
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     "contentType": "image/png",
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     "values": [
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    {
     "label": "1941 - 1960",
     "url": "80c272852c58b7c58227ff4db488b876",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAOxAAADsQBlSsOGwAAAEZJREFUOI1jYaAyYKGZgTk5Of8pNWzKlCmMKC40j5xCtmEnl+cwMDDQ0sujBo4aOGrgqIE4DYQVQeSAKVOmMKIYCBOgFAAA65wMp9yfZXgAAAAASUVORK5CYII=",
     "contentType": "image/png",
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     "values": [
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     "label": "1961 - 1980",
     "url": "d66a05b9f5a60dd41b327a51941cfc92",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAOxAAADsQBlSsOGwAAAEZJREFUOI1jYaAyYKGZgTk5Of8pNWzKlCmMKC58qTqFbMPEb+cwMDDQ0sujBo4aOGrgqIE4DYQVQeSAKVOmMKIYCBOgFAAAv5oMKcu1fRoAAAAASUVORK5CYII=",
     "contentType": "image/png",
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     "values": [
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    },
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     "label": "1981 - 2000",
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     "contentType": "image/png",
     "height": 20,
     "width": 20,
     "values": [
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}