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   "label": "16 - Depth measured by optical light sensor",
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   "label": "17 - Combination of direct measurement methods",
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   "label": "40 - Predicted based on satellite-derived gravity data - depth value is an interpolated value guided by satellite-derived gravity data",
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   "label": "41 - Interpolated based on a computer algorithm - depth value is an interpolated value based on a computer algorithm",
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   "label": "42 - Digital bathymetric contours from charts - depth value taken from a bathymetric contour data set",
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   "label": "43 - Digital bathymetric contours from ENCs - depth value taken from bathymetric contours from an Electronic Navigation Chart (ENC)",
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   "label": "44 - 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": "45 - Predicted based on helicopter/flight-derived gravity data",
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   "label": "46 - Depth estimated by calculating the draft of a grounded iceberg using satellite-derived freeboard measurement.",
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   "label": "70 - 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": "71 - Unknown source - depth value from an unknown source",
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   "label": "72 - Steering points - depth value used to constrain the grid in areas of poor data coverage",
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