{
 "layers": [
  {
   "layerId": 0,
   "layerName": "Electro-magnetic surveys",
   "layerType": "Feature Layer",
   "minScale": 0,
   "maxScale": 0,
   "legend": [
    {
     "label": "",
     "url": "84612a21aa381841fbbff80b1625877d",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAYElEQVQ4je3UsQ2AMAxE0bPkrSjCaIxGisx1CAspwh22O/J7P8nNKTGIwrQSc6CcADtCSQO4O5BdsB0Rjhj3nQdr0gWm0zzxboH59NegtGc1Atl8edD2zCboe3P0y1++ABtMElUOdIB6AAAAAElFTkSuQmCC",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20
    }
   ],
   "legendGroups": [
    {
     "id": "0",
     "heading": ""
    }
   ]
  },
  {
   "layerId": 1,
   "layerName": "IP-resistivity surveys",
   "layerType": "Feature Layer",
   "minScale": 0,
   "maxScale": 0,
   "legend": [
    {
     "label": "",
     "url": "f573ca1447871784c6fc52375a58c452",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAYUlEQVQ4je3UsQ2AMAwF0bPkrSjCaIwGReYyCkoRl4ndkev9JDdfK2YkppmYAwVug4eFBIrB6cCGHci1Alas3XkwK91gOI0Tvg3G0x+DAqWvxnR9vjzY9+yboNnGyU9/+QUmYBJV3jHpOQAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20
    }
   ],
   "legendGroups": [
    {
     "id": "0",
     "heading": ""
    }
   ]
  },
  {
   "layerId": 2,
   "layerName": "Gravity surveys",
   "layerType": "Feature Layer",
   "minScale": 0,
   "maxScale": 0,
   "legend": [
    {
     "label": "",
     "url": "1b6cdb4db285d0a6f33d65a571b01f2c",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAY0lEQVQ4je3UwQ2AIBBE0Q/ZvrAL26EdrUIaYw3qQbgJe5NfwEvmMqI7imFiidWg4yCT6MkTUJYazCS3Ens83Yi4FjRKJjicjBN1ExxP/gx6wvUaPd331YDlz54L+tzr880nn2flEiGxU33DAAAAAElFTkSuQmCC",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20
    }
   ],
   "legendGroups": [
    {
     "id": "0",
     "heading": ""
    }
   ]
  },
  {
   "layerId": 3,
   "layerName": "Radiometrics surveys",
   "layerType": "Feature Layer",
   "minScale": 0,
   "maxScale": 0,
   "legend": [
    {
     "label": "",
     "url": "8b0e25ed226e11f6d2d4c7676bbe8126",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAY0lEQVQ4je3UsQ2AMAxE0R/Je4U12CIjZAS2gDFgsiBLoXDK2B35AzxddXIVGoFJJDaCd4OHiRJkYDOgYvtBnQHPQk0jGJUs0J34CdsC/cmPwQRZX2MG6fdlQf2z74JCFkb1AnJ7DQGuFy6RAAAAAElFTkSuQmCC",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20
    }
   ],
   "legendGroups": [
    {
     "id": "0",
     "heading": ""
    }
   ]
  },
  {
   "layerId": 4,
   "layerName": "Magnetics surveys",
   "layerType": "Feature Layer",
   "minScale": 0,
   "maxScale": 0,
   "legend": [
    {
     "label": "Before 1985",
     "url": "7879fc558d5605e90813b4bc577430b5",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAUklEQVQ4jWNZ/L/4PwMVAQsS+wCFZjkgG3gglrHXkRLTFv8v3g8yFNmFVAEsowZSDFgoNwIVjBpIOWChghkoYNRAygEsDB2g5RklAKWAhQtQCgDnwQz5WwTR/gAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20,
     "values": [
      "1961",
      "1962",
      "1963",
      "1964",
      "1966",
      "1967",
      "1968",
      "1969"
     ]
    },
    {
     "label": "1985-2000",
     "url": "4b7776094e21d21d698d8a401a537c8e",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAV0lEQVQ4jWNheLbyPwMVAQucxch4gCKT/v93QBgIMkwyzJEiA5+v2g8yFOFCKgGWUQMpBiyUG4EKRg2kHLBQwQwUMGog5QAShqDCEVSeUQJQClgkAUoBAGtPFOntIVwKAAAAAElFTkSuQmCC",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20,
     "values": [
      "1986",
      "1987",
      "1992",
      "1994",
      "1995",
      "1996",
      "1998",
      "1999"
     ]
    },
    {
     "label": "2001-2010",
     "url": "84ff50eaa853bf8fd1c0a9beef81131f",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAUklEQVQ4jWMpWMHwn4GKgAWJfYBCsxyQDTwwIYLBkRLTClYw7AcZiuxCqgCWUQMpBiyUG4EKRg2kHLBQwQwUMGog5QAWhg7Q8owSgFLAwgUoBQCqiwn/leqGLQAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20,
     "values": [
      "2001",
      "2002",
      "2003",
      "2004",
      "2006",
      "2008",
      "2009",
      "2010"
     ]
    },
    {
     "label": "After 2010",
     "url": "497e158cf6730d6e362dc42661d4b49c",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAUUlEQVQ4jWNhKPb5z0BFwILEPkChWQ7IBh5g6N3iSJFxxT77QYYiu5AqgGXUQIoBC+VGoIJRAykHLFQwAwWMGkg5gIWhA7Q8owSgFLBwAUoBAFXbCU2btM8WAAAAAElFTkSuQmCC",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20,
     "values": [
      "2011",
      "2012",
      "2014",
      "2015",
      "2016",
      "2017",
      "2018",
      "2019",
      "2020"
     ]
    }
   ],
   "legendGroups": [
    {
     "id": "0",
     "heading": "Year"
    }
   ]
  }
 ]
}