EPSG:9503

COMPD_CS["CIGD11 + GCVD54 height (ft)",
    GEOGCS["CIGD11",
        DATUM["Cayman_Islands_Geodetic_Datum_2011",
            SPHEROID["GRS 1980",6378137,298.257222101,
                AUTHORITY["EPSG","7019"]],
            AUTHORITY["EPSG","1100"]],
        PRIMEM["Greenwich",0,
            AUTHORITY["EPSG","8901"]],
        UNIT["degree",0.0174532925199433,
            AUTHORITY["EPSG","9122"]],
        AUTHORITY["EPSG","6135"]],
    VERT_CS["GCVD54 height (ft)",
        VERT_DATUM["Grand Cayman Vertical Datum 1954",2005,
            AUTHORITY["EPSG","1097"]],
        UNIT["foot",0.3048,
            AUTHORITY["EPSG","9002"]],
        AXIS["Gravity-related height",UP],
        AUTHORITY["EPSG","6130"]],
    AUTHORITY["EPSG","9503"]]

COMPOUNDCRS["CIGD11 + GCVD54 height (ft)",
    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,2],
            AXIS["geodetic latitude (Lat)",north,
                ORDER[1],
                ANGLEUNIT["degree",0.0174532925199433]],
            AXIS["geodetic longitude (Lon)",east,
                ORDER[2],
                ANGLEUNIT["degree",0.0174532925199433]]],
    VERTCRS["GCVD54 height (ft)",
        VDATUM["Grand Cayman Vertical Datum 1954"],
        CS[vertical,1],
            AXIS["gravity-related height (H)",up,
                LENGTHUNIT["foot",0.3048]]],
    USAGE[
        SCOPE["Reversible geoid model transformation."],
        AREA["Cayman Islands - Grand Cayman."],
        BBOX[19.21,-81.46,19.41,-81.04]],
    ID["EPSG",9503]]

GEOGCS["GCS_CIGD11",
    DATUM["D_Cayman_Islands_Geodetic_Datum_2011",
        SPHEROID["GRS_1980",6378137.0,298.257222101]],
    PRIMEM["Greenwich",0.0],
    UNIT["Degree",0.0174532925199433]],
VERTCS["GCVD54_height",
    VDATUM["Grand_Cayman_Vertical_Datum_1954"],
    PARAMETER["Vertical_Shift",0.0],
    PARAMETER["Direction",1.0],
    UNIT["foot",0.3048]]

proj4.defs("EPSG:9503","+proj=longlat +ellps=GRS80 +vunits=ft +no_defs +type=crs");

{
    "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
    "type": "CompoundCRS",
    "name": "CIGD11 + GCVD54 height (ft)",
    "components": [
        {
            "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"
                    }
                ]
            }
        },
        {
            "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
                        }
                    }
                ]
            }
        }
    ],
    "scope": "Reversible geoid model transformation.",
    "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": 9503
    }
}

<?xml version="1.0" encoding="utf-8"?>
<Map srs="+proj=longlat +ellps=GRS80 +vunits=ft +no_defs +type=crs">
	<Layer srs="+proj=longlat +ellps=GRS80 +vunits=ft +no_defs +type=crs">
	</Layer>
</Map>

INSERT into spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext) values ( 9503, 'EPSG', 9503, '+proj=longlat +ellps=GRS80 +vunits=ft +no_defs +type=crs', 'COMPD_CS["CIGD11 + GCVD54 height (ft)",GEOGCS["CIGD11",DATUM["Cayman_Islands_Geodetic_Datum_2011",SPHEROID["GRS 1980",6378137,298.257222101,AUTHORITY["EPSG","7019"]],AUTHORITY["EPSG","1100"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","6135"]],VERT_CS["GCVD54 height (ft)",VERT_DATUM["Grand Cayman Vertical Datum 1954",2005,AUTHORITY["EPSG","1097"]],UNIT["foot",0.3048,AUTHORITY["EPSG","9002"]],AXIS["Gravity-related height",UP],AUTHORITY["EPSG","6130"]],AUTHORITY["EPSG","9503"]]');