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     "url": "1ad11606097564b6240bf69dc511d7f5",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAOxAAADsQBlSsOGwAAAIpJREFUOI3dlLENwCAMBP0SC7EMTeajyTIZ6VNZQmAcggJFvsTmeOmNg3yssB1IkvUZALwGKui4zm7NAjdAD6TSmgU2HXqwui/H1HdIkqOwEkqS6nJdyjPuVKXL/XP4YyAAzAaTY5L1YyMy57J01wDLphFo/e1MoL7mLQkFDW2bHtiqWXoMxbts6QZRMlMh7FrzsAAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "height": 20,
     "width": 20,
     "values": [
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     ]
    },
    {
     "label": "Good",
     "url": "8563d04f91d05d24be4c751227a11a4d",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAOxAAADsQBlSsOGwAAAH5JREFUOI3d1M0JgDAMBeA86LkDdDpH63QO4ALPU6TESI1UUXPsz8eDpE0yuNL3QZK0awAQBhWalvlwz4NdkCQ9SEv3SNKiO7CHWdii9zYlkk7LpvzBHL4LBIBoY2ou8tzYiMRS2nQu2KIi/luuuWznuglbVGTgb3Pm8iUwWiunYUzdrbbT3QAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "height": 20,
     "width": 20,
     "values": [
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     ]
    },
    {
     "label": "No Data",
     "url": "c219403415fe4daa71a8801910c0c53d",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAOxAAADsQBlSsOGwAAAD1JREFUOI1jYaAyYBk1cNRAGhmYl5f3H8aeNGkSI0UGIhsG4+MzdBiE4aRJkxipGobEGEKygaSAUQMHoYEAbaMSCKCfsc4AAAAASUVORK5CYII=",
     "contentType": "image/png",
     "height": 20,
     "width": 20,
     "values": [
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     ]
    }
   ]
  },
  {
   "layerId": 4,
   "layerName": "Sulphur dioxide (SO2)",
   "layerType": "Feature Layer",
   "minScale": 0,
   "maxScale": 0,
   "legend": [
    {
     "label": "Extremely Poor",
     "url": "8635fea7d6c63a1f81c901be210c2471",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABwAAAAcCAYAAAByDd+UAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAOxAAADsQBlSsOGwAAANZJREFUSInt1ksOhCAMBuA28RTe1RDDXbnGP4uZTspTcIqz0O6M2C+tELrQQABA7R0zc0+OZQTZ1r1rXQuvgpKghejQ6+TbElwER7ES7oMjAEjRDASAs1CKSj6NRqAVlsIa/YKtHWgRgkYVWlen8/rgiOhT4YxWllAAODyH1nE9eEU7JbZ1/0OFD/iAwyAz81VHwwd3h5YSvUeB2W31wVF2PfngplxRcjURqZZKleaayh+BGrWsUlopz9mm0ZX+AksbD6c2jZ79pzWsCurFvZO33hityfsFsg2JbYCK7LsAAAAASUVORK5CYII=",
     "contentType": "image/png",
     "height": 28,
     "width": 28,
     "values": [
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    },
    {
     "label": "Very Poor",
     "url": "5024317b73da4e5f84f80315490a46d7",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABoAAAAaCAYAAACpSkzOAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAOxAAADsQBlSsOGwAAAKRJREFUSInt1kEOhSAMBNA24Uj/WB7HY3mn+QszBqqtjQIrZ0vNywQkFJmUkh0EAG9NVfU1RGDV3+1MBLpQBmA4E4GXEABkgAi02Al6iljQYg3UA/Gw9Kl7mwPq2YapW81tNKINw1bz9+iDPqiI7LftqCO+YJP5P6zImFZs00Cj00A9W9VtTlAvzCKXUI2J5N4MNcDv7Zq7RxzOgBFwC3lgNBPlD8YJdJo3sop5AAAAAElFTkSuQmCC",
     "contentType": "image/png",
     "height": 26,
     "width": 26,
     "values": [
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     ]
    },
    {
     "label": "Poor",
     "url": "e7e0ac2f958597201ceb8acb6b9e5927",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABcAAAAXCAYAAADgKtSgAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAOxAAADsQBlSsOGwAAAKJJREFUSIntlTESgCAMBJOZ+D1LH2nJ9yxi4RwT0IAKNI7XEnevgChUiaqqd8bMXPpWatBtXqpiT3KC34EimPEkCfwJOJdMYSVVVSuI8LfgkkDygZZAgAjR0boVbAVo796WHpGerRG0H9v8h38Mzszc+zpOYaXxj4joWJW92qN1hNuDFoFdWgkc7d8KAL7c5y2CK/AJbgfu/Dw8qAv3JKUZLzsErHuyRDsZtQAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "height": 23,
     "width": 23,
     "values": [
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     ]
    },
    {
     "label": "Moderate",
     "url": "3d5eaf493369f13d25f35622708bf75a",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAOxAAADsQBlSsOGwAAAIlJREFUOI3t1D0OgCAMBWCa9ACs3MqjcitWbvCc2lRANBYTB98IzUcJPxwmAYCzOSKi0TjPoFq2y8VauAMBYAZJpAYALHoA72ItbFEFn2AjlL1Yiw4PxRNe0Z2klm18bTz5wS+CRESrrk5M+aUtr+gyphz0LXtRwbRDD2qxDrRoCPMfO6as9XZ8B6YIavLGFVTlAAAAAElFTkSuQmCC",
     "contentType": "image/png",
     "height": 20,
     "width": 20,
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    },
    {
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     "url": "1ad11606097564b6240bf69dc511d7f5",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAOxAAADsQBlSsOGwAAAIpJREFUOI3dlLENwCAMBP0SC7EMTeajyTIZ6VNZQmAcggJFvsTmeOmNg3yssB1IkvUZALwGKui4zm7NAjdAD6TSmgU2HXqwui/H1HdIkqOwEkqS6nJdyjPuVKXL/XP4YyAAzAaTY5L1YyMy57J01wDLphFo/e1MoL7mLQkFDW2bHtiqWXoMxbts6QZRMlMh7FrzsAAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "height": 20,
     "width": 20,
     "values": [
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    },
    {
     "label": "Good",
     "url": "8563d04f91d05d24be4c751227a11a4d",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAOxAAADsQBlSsOGwAAAH5JREFUOI3d1M0JgDAMBeA86LkDdDpH63QO4ALPU6TESI1UUXPsz8eDpE0yuNL3QZK0awAQBhWalvlwz4NdkCQ9SEv3SNKiO7CHWdii9zYlkk7LpvzBHL4LBIBoY2ou8tzYiMRS2nQu2KIi/luuuWznuglbVGTgb3Pm8iUwWiunYUzdrbbT3QAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "height": 20,
     "width": 20,
     "values": [
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    },
    {
     "label": "No Data",
     "url": "c219403415fe4daa71a8801910c0c53d",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAOxAAADsQBlSsOGwAAAD1JREFUOI1jYaAyYBk1cNRAGhmYl5f3H8aeNGkSI0UGIhsG4+MzdBiE4aRJkxipGobEGEKygaSAUQMHoYEAbaMSCKCfsc4AAAAASUVORK5CYII=",
     "contentType": "image/png",
     "height": 20,
     "width": 20,
     "values": [
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    }
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  }
 ]
}