EPSG:8425

Hong Kong Geodetic CS

Attributes

Unit: metre

Geodetic CRS: Hong Kong Geodetic CS

Datum: Hong Kong Geodetic

Ellipsoid: GRS 1980

Prime meridian: Greenwich

Data source: EPSG

Information source: Survey and Mapping Office, Lands Department.

Revision date: 2018-02-15

Scope: Geodesy.

Remarks: Locally sometimes referred to as ITRF96 or WGS 84, these are not strictly correct.

Area of use: China - Hong Kong - onshore and offshore.

Coordinate system: Cartesian 3D CS (geocentric). Axes: geocentric X Y Z. Orientations: X and Y in equatorial plane, X positive through intersection with prime meridian, Y through 0°N 90°E. Z axis parallel to mean earth rotation axis and positive towards North Pole. UoM: m.

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Center coordinates
-2413112.53 5385751.73

Projected bounds:
-2452222.74 5361178.94
-2373975.05 5410061.71

WGS84 bounds:
113.76 22.13
114.51 22.58

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

GEOCCS["Hong Kong Geodetic CS",
    DATUM["Hong_Kong_Geodetic",
        SPHEROID["GRS 1980",6378137,298.257222101,
            AUTHORITY["EPSG","7019"]],
        AUTHORITY["EPSG","1209"]],
    PRIMEM["Greenwich",0,
        AUTHORITY["EPSG","8901"]],
    UNIT["metre",1,
        AUTHORITY["EPSG","9001"]],
    AXIS["Geocentric X",OTHER],
    AXIS["Geocentric Y",OTHER],
    AXIS["Geocentric Z",NORTH],
    AUTHORITY["EPSG","8425"]]

Definition: OGC Well Known Text 2 (2019)

GEODCRS["Hong Kong Geodetic CS",
    DATUM["Hong Kong Geodetic",
        ELLIPSOID["GRS 1980",6378137,298.257222101,
            LENGTHUNIT["metre",1]]],
    PRIMEM["Greenwich",0,
        ANGLEUNIT["degree",0.0174532925199433]],
    CS[Cartesian,3],
        AXIS["(X)",geocentricX,
            ORDER[1],
            LENGTHUNIT["metre",1]],
        AXIS["(Y)",geocentricY,
            ORDER[2],
            LENGTHUNIT["metre",1]],
        AXIS["(Z)",geocentricZ,
            ORDER[3],
            LENGTHUNIT["metre",1]],
    USAGE[
        SCOPE["Geodesy."],
        AREA["China - Hong Kong - onshore and offshore."],
        BBOX[22.13,113.76,22.58,114.51]],
    ID["EPSG",8425]]

Definition: PROJ.4

+proj=geocent +ellps=GRS80 +units=m +no_defs +type=crs

Definition: JavaScript (Proj4js) 

proj4.defs("EPSG:8425","+proj=geocent +ellps=GRS80 +units=m +no_defs +type=crs");

Definition: JSON

{
    "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
    "type": "GeodeticCRS",
    "name": "Hong Kong Geodetic CS",
    "datum": {
        "type": "GeodeticReferenceFrame",
        "name": "Hong Kong Geodetic",
        "ellipsoid": {
            "name": "GRS 1980",
            "semi_major_axis": 6378137,
            "inverse_flattening": 298.257222101
        }
    },
    "coordinate_system": {
        "subtype": "Cartesian",
        "axis": [
            {
                "name": "Geocentric X",
                "abbreviation": "X",
                "direction": "geocentricX",
                "unit": "metre"
            },
            {
                "name": "Geocentric Y",
                "abbreviation": "Y",
                "direction": "geocentricY",
                "unit": "metre"
            },
            {
                "name": "Geocentric Z",
                "abbreviation": "Z",
                "direction": "geocentricZ",
                "unit": "metre"
            }
        ]
    },
    "scope": "Geodesy.",
    "area": "China - Hong Kong - onshore and offshore.",
    "bbox": {
        "south_latitude": 22.13,
        "west_longitude": 113.76,
        "north_latitude": 22.58,
        "east_longitude": 114.51
    },
    "id": {
        "authority": "EPSG",
        "code": 8425
    }
}

Definition: GeoServer

8425=GEOCCS["Hong Kong Geodetic CS",DATUM["Hong_Kong_Geodetic",SPHEROID["GRS 1980",6378137,298.257222101,AUTHORITY["EPSG","7019"]],AUTHORITY["EPSG","1209"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Geocentric X",OTHER],AXIS["Geocentric Y",OTHER],AXIS["Geocentric Z",NORTH],AUTHORITY["EPSG","8425"]]

Definition: MapServer - MAPfile

PROJECTION
	"proj=geocent"
	"ellps=GRS80"
	"units=m"
	"no_defs"
	"type=crs"
END

Definition: Mapnik

<?xml version="1.0" encoding="utf-8"?>
<Map srs="+proj=geocent +ellps=GRS80 +units=m +no_defs +type=crs">
	<Layer srs="+proj=geocent +ellps=GRS80 +units=m +no_defs +type=crs">
	</Layer>
</Map>

Definition: SQL (PostGIS)

INSERT into spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext) values ( 8425, 'EPSG', 8425, '+proj=geocent +ellps=GRS80 +units=m +no_defs +type=crs', 'GEOCCS["Hong Kong Geodetic CS",DATUM["Hong_Kong_Geodetic",SPHEROID["GRS 1980",6378137,298.257222101,AUTHORITY["EPSG","7019"]],AUTHORITY["EPSG","1209"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Geocentric X",OTHER],AXIS["Geocentric Y",OTHER],AXIS["Geocentric Z",NORTH],AUTHORITY["EPSG","8425"]]');