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     "url": "fb3c7bed5c1eb8fba76b5ea9d5cb8988",
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     "url": "fb3c7bed5c1eb8fba76b5ea9d5cb8988",
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     "label": "Steering points - depth value used to constrain the grid in areas of poor data coverage",
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     "groupId": "0",
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    },
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     "label": "Predicted based on satellite-derived gravity data - depth value is an interpolated value guided by satellite-derived gravity data",
     "url": "0cd1a8184b5cf51ceefdf60411845e74",
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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": "0cd1a8184b5cf51ceefdf60411845e74",
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     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20
    },
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     "label": "Digital bathymetric contours from charts - depth value taken from a bathymetric contour data set",
     "url": "0cd1a8184b5cf51ceefdf60411845e74",
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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 (ENC)",
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     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAOklEQVQ4jWNhoDJgoaWB/yk0ixHdQKoAllEDKQYslBuBCkYNpBywUMEMFDBqIOUAOQzB5Rk1DaQKAAC2zAFSQtjJ6gAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "0",
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     "width": 20
    },
    {
     "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": "0cd1a8184b5cf51ceefdf60411845e74",
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     "groupId": "0",
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    },
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     "label": "Predicted based on helicopter/flight-derived gravity data",
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     "contentType": "image/png",
     "groupId": "0",
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    },
    {
     "label": "Depth estimated by calculating the draft of a grounded iceberg using satellite-derived freeboard measurement.",
     "url": "0cd1a8184b5cf51ceefdf60411845e74",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAOklEQVQ4jWNhoDJgoaWB/yk0ixHdQKoAllEDKQYslBuBCkYNpBywUMEMFDBqIOUAOQzB5Rk1DaQKAAC2zAFSQtjJ6gAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20
    },
    {
     "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": "9fe37c026b7bbed80941bb52b10a73d2",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAKklEQVQ4je3MIQEAAAzDsIP613w83MFFQLgyFmr4Ii30KBxhoUfhCAtPexArAFF5acCuAAAAAElFTkSuQmCC",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
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    },
    {
     "label": "Unknown source - depth value from an unknown source",
     "url": "0cd1a8184b5cf51ceefdf60411845e74",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAOklEQVQ4jWNhoDJgoaWB/yk0ixHdQKoAllEDKQYslBuBCkYNpBywUMEMFDBqIOUAOQzB5Rk1DaQKAAC2zAFSQtjJ6gAAAABJRU5ErkJggg==",
     "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": "0cd1a8184b5cf51ceefdf60411845e74",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAOklEQVQ4jWNhoDJgoaWB/yk0ixHdQKoAllEDKQYslBuBCkYNpBywUMEMFDBqIOUAOQzB5Rk1DaQKAAC2zAFSQtjJ6gAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20
    }
   ],
   "legendGroups": [
    {
     "id": "0",
     "heading": "Definition"
    }
   ]
  }
 ]
}