Hong Kong 1980 Grid System

China - Hong Kong - onshore and offshore. , accuracy 1.0 m, code 1825 (default) [7]

Selected transformation

Method: Coordinate Frame rotation (geog2D domain)

Remarks: Derived via ITRF96 @ 1998.121. Published 2002-03-01. Parameter values from Hong Kong 1980 to Hong Kong Geodetic CS (1) (code 9913) assuming Hong Kong Geodetic CS and WGS 84 are equivalent within the accuracy of the CT.

Information source: Geodetic Survey Section, Survey and Mapping Office, Lands Department, Hong Kong. http://www.info.gov.hk/landsd/mapping/tindex.htm

Revision date: 2022-01-21

Attributes

Unit: metre

Geodetic CRS: Hong Kong 1980

Datum: Hong Kong 1980

Ellipsoid: International 1924

Prime meridian: Greenwich

Data source: EPSG

Information source: Survey and Mapping Office, Lands Department. Http://www.info.gov.hk/landsd/mapping/tindex.htm

Revision date: 2006-06-22

Scope: Cadastre, engineering survey, topographic mapping (large scale).

Remarks: Replaces Hong Kong 1963 Grid System.

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

Coordinate system: Cartesian 2D CS. Axes: northing, easting (N,E). Orientations: north, east. UoM: m.

Covered area powered by MapTiler

Center coordinates
831936.99 823933.87

Projected bounds:
793241.31 799018.15
870617.61 848909.8

WGS84 bounds:
113.76 22.13
114.51 22.58

China - Hong Kong - onshore and offshore.

Definition: OGC Well Known Text

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PROJCS["Hong Kong 1980 Grid System",
    GEOGCS["Hong Kong 1980",
        DATUM["Hong_Kong_1980",
            SPHEROID["International 1924",6378388,297],
            TOWGS84[-162.619,-276.959,-161.764,-0.067753,2.243648,1.158828,-1.094246]],
        PRIMEM["Greenwich",0,
            AUTHORITY["EPSG","8901"]],
        UNIT["degree",0.0174532925199433,
            AUTHORITY["EPSG","9122"]],
        AUTHORITY["EPSG","4611"]],
    PROJECTION["Transverse_Mercator"],
    PARAMETER["latitude_of_origin",22.3121333333333],
    PARAMETER["central_meridian",114.178555555556],
    PARAMETER["scale_factor",1],
    PARAMETER["false_easting",836694.05],
    PARAMETER["false_northing",819069.8],
    UNIT["metre",1,
        AUTHORITY["EPSG","9001"]],
    AUTHORITY["EPSG","2326"]]

Definition: OGC Well Known Text 2 (2019)

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PROJCRS["Hong Kong 1980 Grid System",
    BASEGEOGCRS["Hong Kong 1980",
        DATUM["Hong Kong 1980",
            ELLIPSOID["International 1924",6378388,297,
                LENGTHUNIT["metre",1]]],
        PRIMEM["Greenwich",0,
            ANGLEUNIT["degree",0.0174532925199433]],
        ID["EPSG",4611]],
    CONVERSION["Hong Kong 1980 Grid",
        METHOD["Transverse Mercator",
            ID["EPSG",9807]],
        PARAMETER["Latitude of natural origin",22.3121333333333,
            ANGLEUNIT["degree",0.0174532925199433],
            ID["EPSG",8801]],
        PARAMETER["Longitude of natural origin",114.178555555556,
            ANGLEUNIT["degree",0.0174532925199433],
            ID["EPSG",8802]],
        PARAMETER["Scale factor at natural origin",1,
            SCALEUNIT["unity",1],
            ID["EPSG",8805]],
        PARAMETER["False easting",836694.05,
            LENGTHUNIT["metre",1],
            ID["EPSG",8806]],
        PARAMETER["False northing",819069.8,
            LENGTHUNIT["metre",1],
            ID["EPSG",8807]]],
    CS[Cartesian,2],
        AXIS["northing (N)",north,
            ORDER[1],
            LENGTHUNIT["metre",1]],
        AXIS["easting (E)",east,
            ORDER[2],
            LENGTHUNIT["metre",1]],
    USAGE[
        SCOPE["Cadastre, engineering survey, topographic mapping (large scale)."],
        AREA["China - Hong Kong - onshore and offshore."],
        BBOX[22.13,113.76,22.58,114.51]],
    ID["EPSG",2326]]

Definition: ESRI Well Known Text

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PROJCS["Hong_Kong_1980_Grid",
    GEOGCS["GCS_Hong_Kong_1980",
        DATUM["D_Hong_Kong_1980",
            SPHEROID["International_1924",6378388.0,297.0]],
        PRIMEM["Greenwich",0.0],
        UNIT["Degree",0.0174532925199433]],
    PROJECTION["Transverse_Mercator"],
    PARAMETER["False_Easting",836694.05],
    PARAMETER["False_Northing",819069.8],
    PARAMETER["Central_Meridian",114.178555555556],
    PARAMETER["Scale_Factor",1.0],
    PARAMETER["Latitude_Of_Origin",22.3121333333333],
    UNIT["Meter",1.0]]

Definition: PROJ.4

+proj=tmerc +lat_0=22.3121333333333 +lon_0=114.178555555556 +k=1 +x_0=836694.05 +y_0=819069.8 +ellps=intl +towgs84=-162.619,-276.959,-161.764,-0.067753,2.243648,1.158828,-1.094246 +units=m +no_defs +type=crs

Definition: JavaScript (Proj4js)

proj4.defs("EPSG:2326","+proj=tmerc +lat_0=22.3121333333333 +lon_0=114.178555555556 +k=1 +x_0=836694.05 +y_0=819069.8 +ellps=intl +towgs84=-162.619,-276.959,-161.764,-0.067753,2.243648,1.158828,-1.094246 +units=m +no_defs +type=crs");

Definition: JSON

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{
    "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
    "type": "ProjectedCRS",
    "name": "Hong Kong 1980 Grid System",
    "base_crs": {
        "name": "Hong Kong 1980",
        "datum": {
            "type": "GeodeticReferenceFrame",
            "name": "Hong Kong 1980",
            "ellipsoid": {
                "name": "International 1924",
                "semi_major_axis": 6378388,
                "inverse_flattening": 297
            }
        },
        "coordinate_system": {
            "subtype": "ellipsoidal",
            "axis": [
                {
                    "name": "Geodetic latitude",
                    "abbreviation": "Lat",
                    "direction": "north",
                    "unit": "degree"
                },
                {
                    "name": "Geodetic longitude",
                    "abbreviation": "Lon",
                    "direction": "east",
                    "unit": "degree"
                }
            ]
        },
        "id": {
            "authority": "EPSG",
            "code": 4611
        }
    },
    "conversion": {
        "name": "Hong Kong 1980 Grid",
        "method": {
            "name": "Transverse Mercator",
            "id": {
                "authority": "EPSG",
                "code": 9807
            }
        },
        "parameters": [
            {
                "name": "Latitude of natural origin",
                "value": 22.3121333333333,
                "unit": "degree",
                "id": {
                    "authority": "EPSG",
                    "code": 8801
                }
            },
            {
                "name": "Longitude of natural origin",
                "value": 114.178555555556,
                "unit": "degree",
                "id": {
                    "authority": "EPSG",
                    "code": 8802
                }
            },
            {
                "name": "Scale factor at natural origin",
                "value": 1,
                "unit": "unity",
                "id": {
                    "authority": "EPSG",
                    "code": 8805
                }
            },
            {
                "name": "False easting",
                "value": 836694.05,
                "unit": "metre",
                "id": {
                    "authority": "EPSG",
                    "code": 8806
                }
            },
            {
                "name": "False northing",
                "value": 819069.8,
                "unit": "metre",
                "id": {
                    "authority": "EPSG",
                    "code": 8807
                }
            }
        ]
    },
    "coordinate_system": {
        "subtype": "Cartesian",
        "axis": [
            {
                "name": "Northing",
                "abbreviation": "N",
                "direction": "north",
                "unit": "metre"
            },
            {
                "name": "Easting",
                "abbreviation": "E",
                "direction": "east",
                "unit": "metre"
            }
        ]
    },
    "scope": "Cadastre, engineering survey, topographic mapping (large scale).",
    "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": 2326
    }
}

Definition: GeoServer

2326=PROJCS["Hong Kong 1980 Grid System",GEOGCS["Hong Kong 1980",DATUM["Hong_Kong_1980",SPHEROID["International 1924",6378388,297],TOWGS84[-162.619,-276.959,-161.764,-0.067753,2.243648,1.158828,-1.094246]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4611"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",22.3121333333333],PARAMETER["central_meridian",114.178555555556],PARAMETER["scale_factor",1],PARAMETER["false_easting",836694.05],PARAMETER["false_northing",819069.8],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AUTHORITY["EPSG","2326"]]

Definition: MapServer - MAPfile

PROJECTION
	"proj=tmerc"
	"lat_0=22.3121333333333"
	"lon_0=114.178555555556"
	"k=1"
	"x_0=836694.05"
	"y_0=819069.8"
	"ellps=intl"
	"towgs84=-162.619,-276.959,-161.764,-0.067753,2.243648,1.158828,-1.094246"
	"units=m"
	"no_defs"
	"type=crs"
END

Definition: Mapnik

<?xml version="1.0" encoding="utf-8"?>
<Map srs="+proj=tmerc +lat_0=22.3121333333333 +lon_0=114.178555555556 +k=1 +x_0=836694.05 +y_0=819069.8 +ellps=intl +towgs84=-162.619,-276.959,-161.764,-0.067753,2.243648,1.158828,-1.094246 +units=m +no_defs +type=crs">
	<Layer srs="+proj=tmerc +lat_0=22.3121333333333 +lon_0=114.178555555556 +k=1 +x_0=836694.05 +y_0=819069.8 +ellps=intl +towgs84=-162.619,-276.959,-161.764,-0.067753,2.243648,1.158828,-1.094246 +units=m +no_defs +type=crs">
	</Layer>
</Map>

Definition: SQL (PostGIS)

INSERT into spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext) values ( 2326, 'EPSG', 2326, '+proj=tmerc +lat_0=22.3121333333333 +lon_0=114.178555555556 +k=1 +x_0=836694.05 +y_0=819069.8 +ellps=intl +towgs84=-162.619,-276.959,-161.764,-0.067753,2.243648,1.158828,-1.094246 +units=m +no_defs +type=crs', 'PROJCS["Hong Kong 1980 Grid System",GEOGCS["Hong Kong 1980",DATUM["Hong_Kong_1980",SPHEROID["International 1924",6378388,297],TOWGS84[-162.619,-276.959,-161.764,-0.067753,2.243648,1.158828,-1.094246]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4611"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",22.3121333333333],PARAMETER["central_meridian",114.178555555556],PARAMETER["scale_factor",1],PARAMETER["false_easting",836694.05],PARAMETER["false_northing",819069.8],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AUTHORITY["EPSG","2326"]]');

EPSG:2326