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     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20
    },
    {
     "label": "Singlebeam - depth value collected by a single beam echo-sounder",
     "url": "231bbaf6154b0f8e42045c2a258ad1fa",
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     "contentType": "image/png",
     "groupId": "0",
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    {
     "label": "Multibeam - depth value collected by a multibeam echo-sounder",
     "url": "41a0cf5fc27c7a578f77987692c27a77",
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     "contentType": "image/png",
     "groupId": "0",
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     "label": "Seismic - depth value collected by seismic methods",
     "url": "43e231928d3c1045e53daba4d535adb4",
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     "groupId": "0",
     "height": 20,
     "width": 20
    },
    {
     "label": "Isolated sounding - depth value that is not part of a regular survey or trackline",
     "url": "e61dd24c496caf28a6e8384e3330fd41",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAMUlEQVQ4jWNhoDJgoZmB+/6/+E+JQU6MEowoBlILjBo4auCogaMG0tlAWHlGNQOpBQDPPQStvn48lQAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
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    },
    {
     "label": "ENC sounding - depth value extracted from an Electronic Navigation Chart (ENC)",
     "url": "c5cec3bd59ed6a1a2b2c97b8124b4f92",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAMUlEQVQ4jWNhoDJgoZmBxf/v/6fEoF5GRUYUA6kFRg0cNXDUwFED6WwgrDyjmoHUAgDsXwUB1NV/GQAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
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    },
    {
     "label": "Lidar - depth derived from a bathymetric lidar sensor",
     "url": "68a5e3cc5bbbe22bf4babdf990e2fb79",
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     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20
    },
    {
     "label": "Depth measured by optical light sensor",
     "url": "1ac6ece49233c1953fe538d41b5a2f4a",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAMUlEQVQ4jWNhoDJgoZmB/xmO/qfEIEYGa0YUA6kFRg0cNXDUwFED6WwgrDyjmoHUAgAb5gOOmNTxGwAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20
    },
    {
     "label": "Combination of direct measurement methods",
     "url": "e268d81a7a6a141e75dc4b78689cb204",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAMUlEQVQ4jWNhoDJgoZmBLWt//6fEoJpgVkYUA6kFRg0cNXDUwFED6WwgrDyjmoHUAgD5IgUmwdLP1wAAAABJRU5ErkJggg==",
     "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": "92fcdf2267f67b04a3a108ef95419b46",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAL0lEQVQ4jWNhoDJgoZ2BasX/KTLpVi8jqoFUAqMGjho4auCogfQ2EFqeUc9AKgEAgVsEuUECZ2QAAAAASUVORK5CYII=",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
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    },
    {
     "label": "Interpolated based on a computer algorithm - depth value is an interpolated value based on a computer algorithm (e.g. Generic Mapping Tools)",
     "url": "948f75fc67c8817dd599ac4e4faf6fe6",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAL0lEQVQ4jWNhoDJgoZ2Bviv+U2TS5ghGVAOpBEYNHDVw1MBRA+ltILQ8o56BVAIAYfAEXe1mu6MAAAAASUVORK5CYII=",
     "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": "4061f23ba0662fda962be0579671e813",
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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": "e6cd28fa24d3d56070631cb2ab3a095e",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAMUlEQVQ4jWNhoDJgoZmBhQ9X/afEoH75MEYUA6kFRg0cNXDUwFED6WwgrDyjmoHUAgAJcwVW1lRn8QAAAABJRU5ErkJggg==",
     "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": "fb46060479d15ed16c32c3b36b6510c1",
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     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
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    },
    {
     "label": "Predicted based on helicopter/flight-derived gravity data",
     "url": "918c43bc2c32699507ddc9e8524be494",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAMUlEQVQ4jWNhoDJgoZmBn9fl/6fEIN6giYwoBlILjBo4auCogaMG0tlAWHlGNQOpBQAB1gVCf1SFuAAAAABJRU5ErkJggg==",
     "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": "2219b2e5d754d67f8b9fb0feacd05230",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAMUlEQVQ4jWNhoDJgoZmB32e+/k+JQZzpoowoBlILjBo4auCogaMG0tlAWHlGNQOpBQDddwTXQ0mxmwAAAABJRU5ErkJggg==",
     "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": "7710fad852c2d5049c417830eb03d7d1",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAL0lEQVQ4jWNhoDJgoZ2BR///p8gka0ZGVAOpBEYNHDVw1MBRA+ltILQ8o56BVAIAGx8DjmiTrAcAAAAASUVORK5CYII=",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
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    },
    {
     "label": "Unknown source - depth value from an unknown source",
     "url": "811ab8731ffb8c11a70d91c43d9c9eeb",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAMUlEQVQ4jWNhoDJgoZmBfWc8/lNiUJHJDkYUA6kFRg0cNXDUwFED6WwgrDyjmoHUAgAn5AWwzO3BGgAAAABJRU5ErkJggg==",
     "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": "85f1e906ba8cb1534bbabc9ae58d5119",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAMUlEQVQ4jWNhoDJgoZmB9Rlz/lNiUOOMFEYUA6kFRg0cNXDUwFED6WwgrDyjmoHUAgAy7wXPcfHAggAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20
    }
   ],
   "legendGroups": [
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