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                        "unit": "degree"
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                "type": "VerticalCRS",
                "name": "NAVD88 height (ftUS)",
                "datum": {
                  "type": "VerticalReferenceFrame",
                  "name": "North American Vertical Datum 1988"
                },
                "coordinate_system": {
                  "subtype": "vertical",
                  "axis": [
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                      "name": "Gravity-related height",
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                      "direction": "up",
                      "unit": {
                        "type": "LinearUnit",
                        "name": "US survey foot",
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              "nodata": -3.402823e+38,
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