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Geodetic CRS: TWD67
Datum: Taiwan Datum 1967
Ellipsoid: GRS 1967 Modified
Prime meridian: Greenwich
Data source: EPSG
Information source: Aerial Survey Office, Taiwan Forest Bureau.
Revision date: 2012-01-21
Scope: Transformation of coordinates at 5m level of accuracy.
Remarks: Derived at Hu Tzu Shan (23°59'N, 120°58'E). Residuals increase to maximum of 6.4m as distance increases from this point.
Method: Cartesian Grid Offsets
Area of use: Taiwan, Republic of China - onshore - Taiwan Island.
Description: (0,)
Definition: OGC Well Known Text 2 (2019)
COORDINATEOPERATION["TWD67 / TM2 zone 121 to TWD97 / TM2 zone 121 (1)", VERSION["asafi-Twn"], SOURCECRS[ PROJCRS["TWD67 / TM2 zone 121", BASEGEOGCRS["TWD67", DATUM["Taiwan Datum 1967", ELLIPSOID["GRS 1967 Modified",6378160,298.25, LENGTHUNIT["metre",1]]], PRIMEM["Greenwich",0, ANGLEUNIT["degree",0.0174532925199433]], ID["EPSG",3821]], CONVERSION["Taiwan 2-degree TM zone 121", METHOD["Transverse Mercator", ID["EPSG",9807]], PARAMETER["Latitude of natural origin",0, ANGLEUNIT["degree",0.0174532925199433], ID["EPSG",8801]], PARAMETER["Longitude of natural origin",121, ANGLEUNIT["degree",0.0174532925199433], ID["EPSG",8802]], PARAMETER["Scale factor at natural origin",0.9999, SCALEUNIT["unity",1], ID["EPSG",8805]], PARAMETER["False easting",250000, LENGTHUNIT["metre",1], ID["EPSG",8806]], PARAMETER["False northing",0, LENGTHUNIT["metre",1], ID["EPSG",8807]]], CS[Cartesian,2], AXIS["easting (X)",east, ORDER[1], LENGTHUNIT["metre",1]], AXIS["northing (Y)",north, ORDER[2], LENGTHUNIT["metre",1]], ID["EPSG",3828]]], TARGETCRS[ PROJCRS["TWD97 / TM2 zone 121", BASEGEOGCRS["TWD97", DATUM["Taiwan Datum 1997", ELLIPSOID["GRS 1980",6378137,298.257222101, LENGTHUNIT["metre",1]]], PRIMEM["Greenwich",0, ANGLEUNIT["degree",0.0174532925199433]], ID["EPSG",3824]], CONVERSION["Taiwan 2-degree TM zone 121", METHOD["Transverse Mercator", ID["EPSG",9807]], PARAMETER["Latitude of natural origin",0, ANGLEUNIT["degree",0.0174532925199433], ID["EPSG",8801]], PARAMETER["Longitude of natural origin",121, ANGLEUNIT["degree",0.0174532925199433], ID["EPSG",8802]], PARAMETER["Scale factor at natural origin",0.9999, SCALEUNIT["unity",1], ID["EPSG",8805]], PARAMETER["False easting",250000, LENGTHUNIT["metre",1], ID["EPSG",8806]], PARAMETER["False northing",0, LENGTHUNIT["metre",1], ID["EPSG",8807]]], CS[Cartesian,2], AXIS["easting (X)",east, ORDER[1], LENGTHUNIT["metre",1]], AXIS["northing (Y)",north, ORDER[2], LENGTHUNIT["metre",1]], ID["EPSG",3826]]], METHOD["Cartesian Grid Offsets", ID["EPSG",9656]], PARAMETER["Easting offset",828.589, LENGTHUNIT["metre",1], ID["EPSG",8728]], PARAMETER["Northing offset",-206.915, LENGTHUNIT["metre",1], ID["EPSG",8729]], OPERATIONACCURACY[7.0], USAGE[ SCOPE["Transformation of coordinates at 5m level of accuracy."], AREA["Taiwan, Republic of China - onshore - Taiwan Island."], BBOX[21.87,119.99,25.34,122.06]], ID["EPSG",15487], REMARK["Derived at Hu Tzu Shan (23°59'N, 120°58'E). Residuals increase to maximum of 6.4m as distance increases from this point."]]
Definition: JSON
{ "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json", "type": "Transformation", "name": "TWD67 / TM2 zone 121 to TWD97 / TM2 zone 121 (1)", "source_crs": { "type": "ProjectedCRS", "name": "TWD67 / TM2 zone 121", "base_crs": { "name": "TWD67", "datum": { "type": "GeodeticReferenceFrame", "name": "Taiwan Datum 1967", "ellipsoid": { "name": "GRS 1967 Modified", "semi_major_axis": 6378160, "inverse_flattening": 298.25 } }, "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": 3821 } }, "conversion": { "name": "Taiwan 2-degree TM zone 121", "method": { "name": "Transverse Mercator", "id": { "authority": "EPSG", "code": 9807 } }, "parameters": [ { "name": "Latitude of natural origin", "value": 0, "unit": "degree", "id": { "authority": "EPSG", "code": 8801 } }, { "name": "Longitude of natural origin", "value": 121, "unit": "degree", "id": { "authority": "EPSG", "code": 8802 } }, { "name": "Scale factor at natural origin", "value": 0.9999, "unit": "unity", "id": { "authority": "EPSG", "code": 8805 } }, { "name": "False easting", "value": 250000, "unit": "metre", "id": { "authority": "EPSG", "code": 8806 } }, { "name": "False northing", "value": 0, "unit": "metre", "id": { "authority": "EPSG", "code": 8807 } } ] }, "coordinate_system": { "subtype": "Cartesian", "axis": [ { "name": "Easting", "abbreviation": "X", "direction": "east", "unit": "metre" }, { "name": "Northing", "abbreviation": "Y", "direction": "north", "unit": "metre" } ] }, "id": { "authority": "EPSG", "code": 3828 } }, "target_crs": { "type": "ProjectedCRS", "name": "TWD97 / TM2 zone 121", "base_crs": { "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" } ] }, "id": { "authority": "EPSG", "code": 3824 } }, "conversion": { "name": "Taiwan 2-degree TM zone 121", "method": { "name": "Transverse Mercator", "id": { "authority": "EPSG", "code": 9807 } }, "parameters": [ { "name": "Latitude of natural origin", "value": 0, "unit": "degree", "id": { "authority": "EPSG", "code": 8801 } }, { "name": "Longitude of natural origin", "value": 121, "unit": "degree", "id": { "authority": "EPSG", "code": 8802 } }, { "name": "Scale factor at natural origin", "value": 0.9999, "unit": "unity", "id": { "authority": "EPSG", "code": 8805 } }, { "name": "False easting", "value": 250000, "unit": "metre", "id": { "authority": "EPSG", "code": 8806 } }, { "name": "False northing", "value": 0, "unit": "metre", "id": { "authority": "EPSG", "code": 8807 } } ] }, "coordinate_system": { "subtype": "Cartesian", "axis": [ { "name": "Easting", "abbreviation": "X", "direction": "east", "unit": "metre" }, { "name": "Northing", "abbreviation": "Y", "direction": "north", "unit": "metre" } ] }, "id": { "authority": "EPSG", "code": 3826 } }, "method": { "name": "Cartesian Grid Offsets", "id": { "authority": "EPSG", "code": 9656 } }, "parameters": [ { "name": "Easting offset", "value": 828.589, "unit": "metre", "id": { "authority": "EPSG", "code": 8728 } }, { "name": "Northing offset", "value": -206.915, "unit": "metre", "id": { "authority": "EPSG", "code": 8729 } } ], "accuracy": "7.0", "scope": "Transformation of coordinates at 5m level of accuracy.", "area": "Taiwan, Republic of China - onshore - Taiwan Island.", "bbox": { "south_latitude": 21.87, "west_longitude": 119.99, "north_latitude": 25.34, "east_longitude": 122.06 }, "id": { "authority": "EPSG", "code": 15487 }, "remarks": "Derived at Hu Tzu Shan (23°59'N, 120°58'E). Residuals increase to maximum of 6.4m as distance increases from this point." }
Definition: Mapnik
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