TWD97

Attributes

Unit: degree (supplier to define representation)

Geodetic CRS: TWD97

Datum: Taiwan Datum 1997

Ellipsoid: GRS 1980

Prime meridian: Greenwich

Data source: EPSG

Information source: National Land Surveying and Mapping Center (NLSC), http://www.nlsc.gov.tw

Revision date: 2008-08-11

Scope: Geodesy.

Area of use: Taiwan, Republic of China - onshore and offshore - Taiwan Island, Penghu (Pescadores) Islands.

Coordinate system: Ellipsoidal 3D CS. Axes: latitude, longitude, ellipsoidal height. Orientations: north, east, up. UoM: degree, degree, metre.

Covered area powered by MapTiler

Center coordinates
118.97 22.16

Projected bounds:
114.32 17.36
123.61 26.96

WGS84 bounds:
114.32 17.36
123.61 26.96

Taiwan, Republic of China - onshore and offshore - Taiwan Island, Penghu (Pescadores) Islands.

Definition: ESRI WKT

GEOGCS["GCS_TWD_1997",DATUM["D_TWD_1997",SPHEROID["GRS_1980",6378137.0,298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],VERTCS["D_TWD_1997",DATUM["D_TWD_1997",SPHEROID["GRS_1980",6378137.0,298.257222101]],PARAMETER["Vertical_Shift",0.0],PARAMETER["Direction",1.0],UNIT["Meter",1.0]]

Definition: PROJ.4

+proj=longlat +ellps=GRS80 +no_defs +type=crs

Definition: JavaScript (Proj4js)

proj4.defs("EPSG:3823","+proj=longlat +ellps=GRS80 +no_defs +type=crs");

Definition: JSON

{
    "$schema": "https://proj.org/schemas/v0.4/projjson.schema.json",
    "type": "GeographicCRS",
    "name": "TWD97",
    "datum": {
        "type": "GeodeticReferenceFrame",
        "name": "Taiwan Datum 1997",
        "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"
            },
            {
                "name": "Ellipsoidal height",
                "abbreviation": "h",
                "direction": "up",
                "unit": "metre"
            }
        ]
    },
    "scope": "Geodesy.",
    "area": "Taiwan, Republic of China - onshore and offshore - Taiwan Island, Penghu (Pescadores) Islands.",
    "bbox": {
        "south_latitude": 17.36,
        "west_longitude": 114.32,
        "north_latitude": 26.96,
        "east_longitude": 123.61
    },
    "id": {
        "authority": "EPSG",
        "code": 3823
    }
}

Definition: MapServer - MAPfile

PROJECTION
	"proj=longlat"
	"ellps=GRS80"
	"no_defs"
	"type=crs"
END

Definition: Mapnik

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

Definition: SQL (PostGIS)

INSERT into spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext) values ( 3823, 'EPSG', 3823, '+proj=longlat +ellps=GRS80 +no_defs +type=crs', 'None');

Definition: OGC WKT 2 (2019)

GEOGCRS["TWD97",DATUM["Taiwan Datum 1997",ELLIPSOID["GRS 1980",6378137,298.257222101,LENGTHUNIT["metre",1]]],PRIMEM["Greenwich",0,ANGLEUNIT["degree",0.0174532925199433]],CS[ellipsoidal,3],AXIS["geodetic latitude (Lat)",north,ORDER[1],ANGLEUNIT["degree",0.0174532925199433]],AXIS["geodetic longitude (Lon)",east,ORDER[2],ANGLEUNIT["degree",0.0174532925199433]],AXIS["ellipsoidal height (h)",up,ORDER[3],LENGTHUNIT["metre",1]],USAGE[SCOPE["Geodesy."],AREA["Taiwan, Republic of China - onshore and offshore - Taiwan Island, Penghu (Pescadores) Islands."],BBOX[17.36,114.32,26.96,123.61]],ID["EPSG",3823]]

EPSG:3823

Attributes

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