EPSG:7976

HKPD depth

Attributes

Unit: metre

Geodetic CRS: HKPD height

Datum: Hong Kong Principal Datum

Data source: EPSG

Information source: IOGP

Revision date: 2021-04-20

Scope: Intermediate stage in transformations - not used otherwise.

Area of use: China - Hong Kong - onshore.

Coordinate system: Vertical CS. Axis: depth (D). Orientation: down. UoM: m.

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SimpleMap

Center coordinates
22.38 114.1

Projected bounds:
22.19 113.82
22.56 114.39

WGS84 bounds:
113.82 22.19
114.39 22.56

China - Hong Kong - onshore.
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Definition: OGC Well Known Text

VERT_CS["HKPD depth",
    VERT_DATUM["Hong Kong Principal Datum",2005,
        AUTHORITY["EPSG","5135"]],
    UNIT["metre",1,
        AUTHORITY["EPSG","9001"]],
    AXIS["Depth",DOWN],
    AUTHORITY["EPSG","7976"]]

Definition: OGC Well Known Text 2 (2019)

VERTCRS["HKPD depth",
    VDATUM["Hong Kong Principal Datum"],
    CS[vertical,1],
        AXIS["depth (D)",down,
            LENGTHUNIT["metre",1]],
    USAGE[
        SCOPE["Intermediate stage in transformations - not used otherwise."],
        AREA["China - Hong Kong - onshore."],
        BBOX[22.19,113.82,22.56,114.39]],
    ID["EPSG",7976]]

Definition: ESRI Well Known Text

VERTCS["HKPD_depth",
    VDATUM["Hong_Kong_Principal_Datum"],
    PARAMETER["Vertical_Shift",0.0],
    PARAMETER["Direction",-1.0],
    UNIT["Meter",1.0]]

Definition: PROJ.4

+vunits=m +no_defs +type=crs

Definition: JavaScript (Proj4js) 

proj4.defs("EPSG:7976","+vunits=m +no_defs +type=crs");

Definition: JSON

{
    "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
    "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"
            }
        ]
    },
    "scope": "Intermediate stage in transformations - not used otherwise.",
    "area": "China - Hong Kong - onshore.",
    "bbox": {
        "south_latitude": 22.19,
        "west_longitude": 113.82,
        "north_latitude": 22.56,
        "east_longitude": 114.39
    },
    "id": {
        "authority": "EPSG",
        "code": 7976
    }
}

Definition: GeoServer

7976=VERT_CS["HKPD depth",VERT_DATUM["Hong Kong Principal Datum",2005,AUTHORITY["EPSG","5135"]],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Depth",DOWN],AUTHORITY["EPSG","7976"]]

Definition: MapServer - MAPfile

PROJECTION
	"vunits=m"
	"no_defs"
	"type=crs"
END

Definition: Mapnik

<?xml version="1.0" encoding="utf-8"?>
<Map srs="+vunits=m +no_defs +type=crs">
	<Layer srs="+vunits=m +no_defs +type=crs">
	</Layer>
</Map>

Definition: SQL (PostGIS)

INSERT into spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext) values ( 7976, 'EPSG', 7976, '+vunits=m +no_defs +type=crs', 'VERT_CS["HKPD depth",VERT_DATUM["Hong Kong Principal Datum",2005,AUTHORITY["EPSG","5135"]],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Depth",DOWN],AUTHORITY["EPSG","7976"]]');