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     "label": "Land",
     "url": "0cd1a8184b5cf51ceefdf60411845e74",
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     "groupId": "0",
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     "label": "Singlebeam - depth value collected by a single beam echo-sounder",
     "url": "63aebd5d8cdf2c88b24d60af9f9958db",
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     "contentType": "image/png",
     "groupId": "0",
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     "label": "Multibeam - depth value collected by a multibeam echo-sounder",
     "url": "f2c5dae169c5fc091592761e9e28c5b5",
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     "groupId": "0",
     "height": 20,
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    {
     "label": "Seismic - depth value collected by seismic methods",
     "url": "46f79edf7a150166251be13c38e7192b",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAQElEQVQ4jWNhoDJgoZmBz2Yw/KfEIKkMBkYUA6kFWEYNpBiwUG4EKhg1kHLAQgUzUMCogZQDeBjCyjOqGUgtAAA1SgPUoxUQEgAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20
    },
    {
     "label": "Isolated sounding - depth value that is not part of a regular survey or trackline",
     "url": "c231f70ed8097130d55369cf54b6bec9",
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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": "e2c0ddec7e7552684411e575ed000bd6",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAQElEQVQ4jWNhoDJgoZmBxf/v/6fEoF5GRUYUA6kFWEYNpBiwUG4EKhg1kHLAQgUzUMCogZQDeBjCyjOqGUgtAADsXwUB9cYu3gAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20
    },
    {
     "label": "Lidar - depth derived from a bathymetric lidar sensor",
     "url": "73f2af15b940c4b503e058dfb713aa40",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAQElEQVQ4jWNhoDJgoZmBhk3G/ykx6HzdWUYUA6kFWEYNpBiwUG4EKhg1kHLAQgUzUMCogZQDeBjCyjOqGUgtAABozAZs5+cV3AAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20
    },
    {
     "label": "Depth measured by optical light sensor",
     "url": "537643ac6fee08dce3ada3c42bd2622b",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAP0lEQVQ4je3UsQ0AIBBCUS5hK+d3rrPShBrs7g/wCgqIcPwGNnY7UGGVgKk4oB19QhvQjwFDGtDvbXj/LAamOhvmA44eiyg0AAAAAElFTkSuQmCC",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20
    },
    {
     "label": "Combination of direct measurement methods",
     "url": "e3884c4bb4844d10d3c82197258a05e8",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAQElEQVQ4jWNhoDJgoZmBLWt//6fEoJpgVkYUA6kFWEYNpBiwUG4EKhg1kHLAQgUzUMCogZQDeBjCyjOqGUgtAAD5IgUmPo0NUQAAAABJRU5ErkJggg==",
     "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",
     "height": 20,
     "width": 20
    },
    {
     "label": "Interpolated based on a computer algorithm - depth value is an interpolated value based on a computer algorithm (e.g. Generic Mapping Tools)",
     "url": "e3084e8c68497fca92cc3049d27511d5",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAPklEQVQ4jWNhoDJgoZ2Bviv+U2TS5ghGVAOpBFhGDaQYsFBuBCoYNZBywEIFM1DAqIGUA0QYQssz6hlIJQAAYfAEXWhgVFQAAAAASUVORK5CYII=",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20
    },
    {
     "label": "Digital bathymetric contours from charts - depth value taken from a bathymetric contour data set",
     "url": "fd1806e510d04962fa4abd0af9eb9819",
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     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20
    },
    {
     "label": " Digital bathymetric contours from ENCs - depth value taken from bathymetric contours from an Electronic Navigation Chart (ENC)",
     "url": "a7115fc769f6b23d19d0576d8f118ae3",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAQElEQVQ4jWNhoDJgoZmBhQ9X/afEoH75MEYUA6kFWEYNpBiwUG4EKhg1kHLAQgUzUMCogZQDeBjCyjOqGUgtAAAJcwVWbCvjcgAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
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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": "e0b7fc2b30118201ea7e2c85d5a544b4",
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     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20
    },
    {
     "label": "Predicted based on helicopter/flight-derived gravity data",
     "url": "b1b1e1899e8f1c8e93ee469771624a2f",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAQElEQVQ4jWNhoDJgoZmBn9fl/6fEIN6giYwoBlILsIwaSDFgodwIVDBqIOWAhQpmoIBRAykH8DCElWdUM5BaAAAB1gVCjWOaoQAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20
    },
    {
     "label": "Depth estimated by calculating the draft of a grounded iceberg using satellite-derived freeboard measurement.",
     "url": "3fbf4755471eb2347838af13939cf519",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAQElEQVQ4jWNhoDJgoZmB32e+/k+JQZzpoowoBlILsIwaSDFgodwIVDBqIOWAhQpmoIBRAykH8DCElWdUM5BaAADddwTXFiftTgAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
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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, e.g. single beam, multibeam, interpolation etc.",
     "url": "652256e55abdda0d29965d182c3232e8",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAPklEQVQ4jWNhoDJgoZ2BR///p8gka0ZGVAOpBFhGDaQYsFBuBCoYNZBywEIFM1DAqIGUA0QYQssz6hlIJQAAGx8DjgmphNAAAAAASUVORK5CYII=",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20
    },
    {
     "label": "Unknown source - depth value from an unknown source",
     "url": "5992cd60abf334c7bb25a1472ca33c68",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAQElEQVQ4jWNhoDJgoZmBfWc8/lNiUJHJDkYUA6kFWEYNpBiwUG4EKhg1kHLAQgUzUMCogZQDeBjCyjOqGUgtAAAn5AWw2vADyAAAAABJRU5ErkJggg==",
     "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": "6611d2fa04c2a6dd4553b8b2fcf5597d",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAQElEQVQ4jWNhoDJgoZmB9Rlz/lNiUOOMFEYUA6kFWEYNpBiwUG4EKhg1kHLAQgUzUMCogZQDeBjCyjOqGUgtAAAy7wXPbNQz+gAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20
    }
   ],
   "legendGroups": [
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     "heading": "Value"
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