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 "features": [
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   "Type": "Land",
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   "Type": "Direct",
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  }},
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  {"attributes": {
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  }},
  {"attributes": {
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  }},
  {"attributes": {
   "Type": "Direct",
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  }},
  {"attributes": {
   "Type": "Direct",
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  }},
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   "Type": "Direct",
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  }},
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  }},
  {"attributes": {
   "Type": "Indirect",
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  }},
  {"attributes": {
   "Type": "Indirect",
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  }},
  {"attributes": {
   "Type": "Indirect",
   "Value": 43,
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   "Count": 756400,
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  }},
  {"attributes": {
   "Type": "Indirect",
   "Value": 44,
   "OID": 13,
   "Count": 32425473,
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  }},
  {"attributes": {
   "Type": "Indirect",
   "Value": 45,
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   "TID": "Predicted based on helicopter/flight-derived gravity data"
  }},
  {"attributes": {
   "Type": "Indirect",
   "Value": 46,
   "OID": 15,
   "Count": 22,
   "TID": "Depth estimated by calculating the draft of a grounded iceberg using satellite-derived freeboard measurement."
  }},
  {"attributes": {
   "Type": "Unknown",
   "Value": 70,
   "OID": 16,
   "Count": 87103879,
   "TID": "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."
  }},
  {"attributes": {
   "Type": "Unknown",
   "Value": 71,
   "OID": 17,
   "Count": 13699,
   "TID": "Unknown source - depth value from an unknown source"
  }},
  {"attributes": {
   "Type": "Unknown",
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   "TID": "Steering points - depth value used to constrain the grid in areas of poor data coverage"
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