EPSG:7983

HKPD height to HKCD depth (1)

Attributes

Geodetic CRS: HKPD height

Datum: Hong Kong Principal Datum

Data source: EPSG

Information source: IOGP

Revision date: 2021-04-20

Steps of transformation: 7812 7977

Scope: Hydrography and nautical charting.

Area of use: China - Hong Kong - offshore.

Description: (0,)

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China - Hong Kong - offshore.

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Definition: OGC Well Known Text 2 (2019)

CONCATENATEDOPERATION["HKPD height to HKCD depth (1)",
    VERSION["IOGP-HK"],
    SOURCECRS[
        VERTCRS["HKPD height",
            VDATUM["Hong Kong Principal Datum"],
            CS[vertical,1],
                AXIS["gravity-related height (H)",up,
                    LENGTHUNIT["metre",1]],
            ID["EPSG",5738]]],
    TARGETCRS[
        VERTCRS["HKCD depth",
            VDATUM["Hong Kong Chart Datum"],
            CS[vertical,1],
                AXIS["depth (D)",down,
                    LENGTHUNIT["metre",1]],
            ID["EPSG",5739]]],
    STEP[
        CONVERSION["Height <> Depth Conversion",
            METHOD["Height Depth Reversal",
                ID["EPSG",1068]],
            ID["EPSG",7812]]],
    STEP[
        COORDINATEOPERATION["HKPD depth to HKCD depth (1)",
            VERSION["SMO-HK"],
            SOURCECRS[
                VERTCRS["HKPD depth",
                    VDATUM["Hong Kong Principal Datum"],
                    CS[vertical,1],
                        AXIS["depth (D)",down,
                            LENGTHUNIT["metre",1]],
                    ID["EPSG",7976]]],
            TARGETCRS[
                VERTCRS["HKCD depth",
                    VDATUM["Hong Kong Chart Datum"],
                    CS[vertical,1],
                        AXIS["depth (D)",down,
                            LENGTHUNIT["metre",1]],
                    ID["EPSG",5739]]],
            METHOD["Vertical Offset",
                ID["EPSG",9616]],
            PARAMETER["Vertical Offset",-0.146,
                LENGTHUNIT["metre",1],
                ID["EPSG",8603]],
            OPERATIONACCURACY[0.0],
            ID["EPSG",7977],
            REMARK["The HKPD vertical reference surface is 0.146m above the HKCD surface."]]],
    OPERATIONACCURACY[0.0],
    USAGE[
        SCOPE["Hydrography and nautical charting."],
        AREA["China - Hong Kong - offshore."],
        BBOX[22.13,113.76,22.58,114.51]],
    ID["EPSG",7983]]

Definition: PROJ.4

+proj=pipeline +step +proj=axisswap +order=1,2,-3 +step +proj=geogoffset +dh=-0.146

Definition: JavaScript (Proj4js) 

proj4.defs("EPSG:7983","+proj=pipeline +step +proj=axisswap +order=1,2,-3 +step +proj=geogoffset +dh=-0.146");

Definition: JSON

{
    "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
    "type": "ConcatenatedOperation",
    "name": "HKPD height to HKCD depth (1)",
    "source_crs": {
        "type": "VerticalCRS",
        "name": "HKPD height",
        "datum": {
            "type": "VerticalReferenceFrame",
            "name": "Hong Kong Principal Datum"
        },
        "coordinate_system": {
            "subtype": "vertical",
            "axis": [
                {
                    "name": "Gravity-related height",
                    "abbreviation": "H",
                    "direction": "up",
                    "unit": "metre"
                }
            ]
        },
        "id": {
            "authority": "EPSG",
            "code": 5738
        }
    },
    "target_crs": {
        "type": "VerticalCRS",
        "name": "HKCD depth",
        "datum": {
            "type": "VerticalReferenceFrame",
            "name": "Hong Kong Chart Datum"
        },
        "coordinate_system": {
            "subtype": "vertical",
            "axis": [
                {
                    "name": "Depth",
                    "abbreviation": "D",
                    "direction": "down",
                    "unit": "metre"
                }
            ]
        },
        "id": {
            "authority": "EPSG",
            "code": 5739
        }
    },
    "steps": [
        {
            "type": "Conversion",
            "name": "Height <> Depth Conversion",
            "method": {
                "name": "Height Depth Reversal",
                "id": {
                    "authority": "EPSG",
                    "code": 1068
                }
            },
            "id": {
                "authority": "EPSG",
                "code": 7812
            }
        },
        {
            "type": "Transformation",
            "name": "HKPD depth to HKCD depth (1)",
            "source_crs": {
                "type": "VerticalCRS",
                "name": "HKPD depth",
                "datum": {
                    "type": "VerticalReferenceFrame",
                    "name": "Hong Kong Principal Datum"
                },
                "coordinate_system": {
                    "subtype": "vertical",
                    "axis": [
                        {
                            "name": "Depth",
                            "abbreviation": "D",
                            "direction": "down",
                            "unit": "metre"
                        }
                    ]
                },
                "id": {
                    "authority": "EPSG",
                    "code": 7976
                }
            },
            "target_crs": {
                "type": "VerticalCRS",
                "name": "HKCD depth",
                "datum": {
                    "type": "VerticalReferenceFrame",
                    "name": "Hong Kong Chart Datum"
                },
                "coordinate_system": {
                    "subtype": "vertical",
                    "axis": [
                        {
                            "name": "Depth",
                            "abbreviation": "D",
                            "direction": "down",
                            "unit": "metre"
                        }
                    ]
                },
                "id": {
                    "authority": "EPSG",
                    "code": 5739
                }
            },
            "method": {
                "name": "Vertical Offset",
                "id": {
                    "authority": "EPSG",
                    "code": 9616
                }
            },
            "parameters": [
                {
                    "name": "Vertical Offset",
                    "value": -0.146,
                    "unit": "metre",
                    "id": {
                        "authority": "EPSG",
                        "code": 8603
                    }
                }
            ],
            "accuracy": "0.0",
            "id": {
                "authority": "EPSG",
                "code": 7977
            },
            "remarks": "The HKPD vertical reference surface is 0.146m above the HKCD surface."
        }
    ],
    "accuracy": "0.0",
    "scope": "Hydrography and nautical charting.",
    "area": "China - Hong Kong - offshore.",
    "bbox": {
        "south_latitude": 22.13,
        "west_longitude": 113.76,
        "north_latitude": 22.58,
        "east_longitude": 114.51
    },
    "id": {
        "authority": "EPSG",
        "code": 7983
    }
}

Definition: MapServer - MAPfile

PROJECTION
	"proj=pipeline"
	"step"
	"proj=axisswap"
	"order=1,2,-3"
	"step"
	"proj=geogoffset"
	"dh=-0.146"
END

Definition: Mapnik

<?xml version="1.0" encoding="utf-8"?>
<Map srs="+proj=pipeline +step +proj=axisswap +order=1,2,-3 +step +proj=geogoffset +dh=-0.146">
	<Layer srs="+proj=pipeline +step +proj=axisswap +order=1,2,-3 +step +proj=geogoffset +dh=-0.146">
	</Layer>
</Map>

Definition: SQL (PostGIS)

INSERT into spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext) values ( 7983, 'EPSG', 7983, '+proj=pipeline +step +proj=axisswap +order=1,2,-3 +step +proj=geogoffset +dh=-0.146', 'None');