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   "groupId": "0",
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   "label": "Predicted based on satellite-derived gravity data - depth value is an interpolated value guided by satellite-derived gravity data",
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   "label": "Digital bathymetric contours from charts - depth value taken from a bathymetric contour data set",
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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",
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   "label": "Depth estimated by calculating the draft of a grounded iceberg using satellite-derived freeboard measurement.",
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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.",
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   "label": "Steering points - depth value used to constrain the grid in areas of poor data coverage",
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