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     "label": "Land",
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     "groupId": "0",
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    },
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     "label": "Singlebeam - depth value collected by a single beam echo-sounder",
     "url": "c9e9f7e25e4813ffb1c99b99c253f205",
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     "label": "Multibeam - depth value collected by a multibeam echo-sounder",
     "url": "f2c5dae169c5fc091592761e9e28c5b5",
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     "groupId": "0",
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     "label": "Seismic - depth value collected by seismic methods",
     "url": "0d5324501d71b6985fcfb4b2c096225c",
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     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
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    },
    {
     "label": "Isolated sounding - depth value that is not part of a regular survey or trackline",
     "url": "537643ac6fee08dce3ada3c42bd2622b",
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     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20
    },
    {
     "label": "ENC sounding - depth value extracted from an Electronic Navigation Chart (ENC)",
     "url": "279eac4cfeea0797a05a92a5d5053622",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAQElEQVQ4jWNhoDJgoZmBZzvT/lNikHH5LEYUA6kFWEYNpBiwUG4EKhg1kHLAQgUzUMCogZQDeBjCyjOqGUgtAAAe0wWWUW0D9AAAAABJRU5ErkJggg==",
     "contentType": "image/png",
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    },
    {
     "label": "Lidar - depth derived from a bathymetric lidar sensor",
     "url": "46f79edf7a150166251be13c38e7192b",
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     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20
    },
    {
     "label": "Depth measured by optical light sensor",
     "url": "f956f354500b74e6708f73366d6dfef5",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAQElEQVQ4jWNhoDJgoZmB/y/X/6fEIEbdRkYUA6kFWEYNpBiwUG4EKhg1kHLAQgUzUMCogZQDeBjCyjOqGUgtAADrcwUB+NlGbgAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20
    },
    {
     "label": "Combination of direct measurement methods",
     "url": "878218fcdd63fd91aa866133ef2e518a",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAQElEQVQ4jWNhoDJgoZmBaeVn/1Ni0KxOY0YUA6kFWEYNpBiwUG4EKhg1kHLAQgUzUMCogZQDeBjCyjOqGUgtAAAl0QWoHxMtSAAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20
    },
    {
     "label": "Predicted based on satellite-derived gravity data - depth value is an interpolated value guided by satellite-derived gravity data",
     "url": "4a503c55691ea85054195556fc445eba",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAPklEQVQ4jWNhoDJgoZ2BasX/KTLpVi8jqoFUAiyjBlIMWCg3AhWMGkg5YKGCGShg1EDKASIMoeUZ9QykEgAAgVsEuTgzRnsAAAAASUVORK5CYII=",
     "contentType": "image/png",
     "groupId": "0",
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    },
    {
     "label": "Interpolated based on a computer algorithm - depth value is an interpolated value based on a computer algorithm",
     "url": "96651fafcca3358064bf05cfc3e84deb",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAPklEQVQ4jWNhoDJgoZ2BK1r+U2RSRA0jqoFUAiyjBlIMWCg3AhWMGkg5YKGCGShg1EDKASIMoeUZ9QykEgAATuQEJlk8tXAAAAAASUVORK5CYII=",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
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    },
    {
     "label": "Digital bathymetric contours from charts - depth value taken from a bathymetric contour data set",
     "url": "7b2f328c6c23f0b35ecfa1321a18d8be",
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     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
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    },
    {
     "label": "Digital bathymetric contours from ENCs - depth value taken from bathymetric contours from an Electronic Navigation Chart",
     "url": "68402bda03ea3a92bebd190e70a66fb9",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAQElEQVQ4jWNhoDJgoZmBPsUM/ykxaEsvAyOKgdQCLKMGUgxYKDcCFYwaSDlgoYIZKGDUQMoBPAxh5RnVDKQWAAB3jASTphffGgAAAABJRU5ErkJggg==",
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    },
    {
     "label": "Bathymetric sounding - depth value at this location is constrained by bathymetric sounding(s) within a gridded data set where interpolation between sounding points is guided by satellite-derived gravity data",
     "url": "63aebd5d8cdf2c88b24d60af9f9958db",
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     "contentType": "image/png",
     "groupId": "0",
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    },
    {
     "label": "Predicted based on helicopter/flight-derived gravity data",
     "url": "a5a57926f49daf42900bcc87a7d3882a",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAQElEQVQ4jWNhoDJgoZmBq9LO/qfEoLBZxowoBlILsIwaSDFgodwIVDBqIOWAhQpmoIBRAykH8DCElWdUM5BaAAAUBQV1OOFrUwAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
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    },
    {
     "label": "Depth estimated by calculating the draft of a grounded iceberg using satellite-derived freeboard measurement",
     "url": "e0a96b14af8053c0c83980c363563a52",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAQElEQVQ4jWNhoDJgoZmB1+bu+U+JQVrJLowoBlILsIwaSDFgodwIVDBqIOWAhQpmoIBRAykH8DCElWdUM5BaAAD3iQUjHnb9SAAAAABJRU5ErkJggg==",
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     "groupId": "0",
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    },
    {
     "label": "Pre-generated grid - depth value is taken from a pre-generated grid that is based on mixed source data types",
     "url": "a408d95edd8b9a11da5ab0389cb6015e",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAQElEQVQ4jWNhoDJgoZmBPs8Y/lNi0BYpBkYUA6kFWEYNpBiwUG4EKhg1kHLAQgUzUMCogZQDeBjCyjOqGUgtAABQBAQgPw+PMgAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
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    },
    {
     "label": "Unknown source - depth value from an unknown source",
     "url": "e763bb2bcdc3fb984c83956aa9532f52",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAQElEQVQ4jWNhoDJgoZmBxQw+/ykxqJdhCyOKgdQCLKMGUgxYKDcCFYwaSDlgoYIZKGDUQMoBPAxh5RnVDKQWAAB1sQSTepiGSgAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20
    },
    {
     "label": "Steering points - depth value used to constrain the grid in areas of poor data coverage",
     "url": "9a5047fb4daaadb1ffc0d025eba36104",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAP0lEQVQ4je3UsQ0AIBBCUU0YlbHYVaszuRrs7g/wCgqwwuEbKOk4EMndwFQY0A4+0RvQDwGjNaDf27D+LAamuhb6BX7ytpejAAAAAElFTkSuQmCC",
     "contentType": "image/png",
     "groupId": "0",
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    }
   ],
   "legendGroups": [
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