EPSG:6138

COORDINATEOPERATION["CIGD11 to GCVD54 height (ft) (1)",
    VERSION["LSD-Cym"],
    SOURCECRS[
        GEOGCRS["CIGD11",
            DATUM["Cayman Islands Geodetic Datum 2011",
                ELLIPSOID["GRS 1980",6378137,298.257222101,
                    LENGTHUNIT["metre",1]]],
            PRIMEM["Greenwich",0,
                ANGLEUNIT["degree",0.0174532925199433]],
            CS[ellipsoidal,3],
                AXIS["geodetic latitude (Lat)",north,
                    ORDER[1],
                    ANGLEUNIT["degree",0.0174532925199433]],
                AXIS["geodetic longitude (Lon)",east,
                    ORDER[2],
                    ANGLEUNIT["degree",0.0174532925199433]],
                AXIS["ellipsoidal height (h)",up,
                    ORDER[3],
                    LENGTHUNIT["metre",1]],
            ID["EPSG",6134]]],
    TARGETCRS[
        VERTCRS["GCVD54 height (ft)",
            VDATUM["Grand Cayman Vertical Datum 1954"],
            CS[vertical,1],
                AXIS["gravity-related height (H)",up,
                    LENGTHUNIT["foot",0.3048]],
            ID["EPSG",6130]]],
    METHOD["Geographic3D to GravityRelatedHeight (CI)",
        ID["EPSG",1050]],
    PARAMETERFILE["Geoid (height correction) model file","GCGM0811.TXT"],
    OPERATIONACCURACY[0.03],
    USAGE[
        SCOPE["Derivation of gravity-related heights from GNSS observations."],
        AREA["Cayman Islands - Grand Cayman."],
        BBOX[19.21,-81.46,19.41,-81.04]],
    ID["EPSG",6138],
    REMARK["Care: source CRS heights are in metres, transformation file parameter values and target CRS heights are in feet. For reversible alternative to this transformation see CIGD11 to CIGD11 + GCVD54 height (ft)) (code 9603)."]]

proj4.defs("EPSG:6138","+proj=pipeline +step +proj=axisswap +order=2,1 +step +proj=unitconvert +xy_in=deg +xy_out=rad +step +inv +proj=vgridshift +grids=GCGM0811.TXT +multiplier=1 +step +proj=unitconvert +xy_in=rad +xy_out=deg +step +proj=axisswap +order=2,1");

{
    "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
    "type": "Transformation",
    "name": "CIGD11 to GCVD54 height (ft) (1)",
    "source_crs": {
        "type": "GeographicCRS",
        "name": "CIGD11",
        "datum": {
            "type": "GeodeticReferenceFrame",
            "name": "Cayman Islands Geodetic Datum 2011",
            "ellipsoid": {
                "name": "GRS 1980",
                "semi_major_axis": 6378137,
                "inverse_flattening": 298.257222101
            }
        },
        "coordinate_system": {
            "subtype": "ellipsoidal",
            "axis": [
                {
                    "name": "Geodetic latitude",
                    "abbreviation": "Lat",
                    "direction": "north",
                    "unit": "degree"
                },
                {
                    "name": "Geodetic longitude",
                    "abbreviation": "Lon",
                    "direction": "east",
                    "unit": "degree"
                },
                {
                    "name": "Ellipsoidal height",
                    "abbreviation": "h",
                    "direction": "up",
                    "unit": "metre"
                }
            ]
        },
        "id": {
            "authority": "EPSG",
            "code": 6134
        }
    },
    "target_crs": {
        "type": "VerticalCRS",
        "name": "GCVD54 height (ft)",
        "datum": {
            "type": "VerticalReferenceFrame",
            "name": "Grand Cayman Vertical Datum 1954"
        },
        "coordinate_system": {
            "subtype": "vertical",
            "axis": [
                {
                    "name": "Gravity-related height",
                    "abbreviation": "H",
                    "direction": "up",
                    "unit": {
                        "type": "LinearUnit",
                        "name": "foot",
                        "conversion_factor": 0.3048
                    }
                }
            ]
        },
        "id": {
            "authority": "EPSG",
            "code": 6130
        }
    },
    "method": {
        "name": "Geographic3D to GravityRelatedHeight (CI)",
        "id": {
            "authority": "EPSG",
            "code": 1050
        }
    },
    "parameters": [
        {
            "name": "Geoid (height correction) model file",
            "value": "GCGM0811.TXT",
            "id": {
                "authority": "EPSG",
                "code": 8666
            }
        }
    ],
    "accuracy": "0.03",
    "scope": "Derivation of gravity-related heights from GNSS observations.",
    "area": "Cayman Islands - Grand Cayman.",
    "bbox": {
        "south_latitude": 19.21,
        "west_longitude": -81.46,
        "north_latitude": 19.41,
        "east_longitude": -81.04
    },
    "id": {
        "authority": "EPSG",
        "code": 6138
    },
    "remarks": "Care: source CRS heights are in metres, transformation file parameter values and target CRS heights are in feet. For reversible alternative to this transformation see CIGD11 to CIGD11 + GCVD54 height (ft)) (code 9603)."
}

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	</Layer>
</Map>

INSERT into spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext) values ( 6138, 'EPSG', 6138, '+proj=pipeline +step +proj=axisswap +order=2,1 +step +proj=unitconvert +xy_in=deg +xy_out=rad +step +inv +proj=vgridshift +grids=GCGM0811.TXT +multiplier=1 +step +proj=unitconvert +xy_in=rad +xy_out=deg +step +proj=axisswap +order=2,1', 'None');