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Method: Coordinate Frame rotation (geog2D domain)
Remarks: Parameter vales are from CI1979 to WGS 84 (1) (code 1081) assuming that WGS 84 is equivalent to NZGD2000 within the accuracy of the transformation.
Information source: Land Information New Zealand: LINZS25000 Standard for New Zealand Geodetic Datum 2000; 16 November 2007.
Revision date: 2008-04-04
Unit: degree (supplier to define representation)
Geodetic CRS: Chatham Islands 1979
Datum: Chatham Islands Datum 1979
Ellipsoid: International 1924
Prime meridian: Greenwich
Data source: EPSG
Information source: Office of Surveyor General (OSG) Technical Report 14, June 2001.
Revision date: 2008-04-04
Scope: Geodesy.
Remarks: Replaces CI1971. Replaced by NZGD2000 from March 2000.
Area of use: New Zealand - Chatham Islands group - onshore.
Coordinate system: Ellipsoidal 2D CS. Axes: latitude, longitude. Orientations: north, east. UoM: degree
&stroke=red&width=2&path=-44.64,-177.25|-43.3,-177.25|-43.3,-175.54|-44.64,-175.54|-44.64,-177.25)
Center coordinates
-176.4 -43.97
WGS84 bounds:
-177.25 -44.64
-175.54 -43.3
Definition: OGC Well Known Text
GEOGCS["Chatham Islands 1979", DATUM["Chatham_Islands_Datum_1979", SPHEROID["International 1924",6378388,297], TOWGS84[174.05,-25.49,112.57,0,0,-0.554,0.2263]], PRIMEM["Greenwich",0, AUTHORITY["EPSG","8901"]], UNIT["degree",0.0174532925199433, AUTHORITY["EPSG","9122"]], AUTHORITY["EPSG","4673"]]
Definition: OGC Well Known Text 2 (2019)
BOUNDCRS[ SOURCECRS[ GEOGCRS["Chatham Islands 1979", DATUM["Chatham Islands Datum 1979", ELLIPSOID["International 1924",6378388,297, LENGTHUNIT["metre",1]]], PRIMEM["Greenwich",0, ANGLEUNIT["degree",0.0174532925199433]], CS[ellipsoidal,2], AXIS["geodetic latitude (Lat)",north, ORDER[1], ANGLEUNIT["degree",0.0174532925199433]], AXIS["geodetic longitude (Lon)",east, ORDER[2], ANGLEUNIT["degree",0.0174532925199433]], USAGE[ SCOPE["Geodesy."], AREA["New Zealand - Chatham Islands group - onshore."], BBOX[-44.64,-177.25,-43.3,-175.54]], ID["EPSG",4673]]], TARGETCRS[ GEOGCRS["WGS 84", ENSEMBLE["World Geodetic System 1984 ensemble", MEMBER["World Geodetic System 1984 (Transit)"], MEMBER["World Geodetic System 1984 (G730)"], MEMBER["World Geodetic System 1984 (G873)"], MEMBER["World Geodetic System 1984 (G1150)"], MEMBER["World Geodetic System 1984 (G1674)"], MEMBER["World Geodetic System 1984 (G1762)"], MEMBER["World Geodetic System 1984 (G2139)"], ELLIPSOID["WGS 84",6378137,298.257223563, LENGTHUNIT["metre",1]], ENSEMBLEACCURACY[2.0]], PRIMEM["Greenwich",0, ANGLEUNIT["degree",0.0174532925199433]], CS[ellipsoidal,2], AXIS["geodetic latitude (Lat)",north, ORDER[1], ANGLEUNIT["degree",0.0174532925199433]], AXIS["geodetic longitude (Lon)",east, ORDER[2], ANGLEUNIT["degree",0.0174532925199433]], USAGE[ SCOPE["Horizontal component of 3D system."], AREA["World."], BBOX[-90,-180,90,180]], ID["EPSG",4326]]], ABRIDGEDTRANSFORMATION["Transformation from unknown to WGS84", METHOD["Position Vector transformation (geog2D domain)", ID["EPSG",9606]], PARAMETER["X-axis translation",174.05, ID["EPSG",8605]], PARAMETER["Y-axis translation",-25.49, ID["EPSG",8606]], PARAMETER["Z-axis translation",112.57, ID["EPSG",8607]], PARAMETER["X-axis rotation",0, ID["EPSG",8608]], PARAMETER["Y-axis rotation",0, ID["EPSG",8609]], PARAMETER["Z-axis rotation",-0.554, ID["EPSG",8610]], PARAMETER["Scale difference",1.0000002263, ID["EPSG",8611]]]]
Definition: JSON
{ "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json", "type": "BoundCRS", "source_crs": { "type": "GeographicCRS", "name": "Chatham Islands 1979", "datum": { "type": "GeodeticReferenceFrame", "name": "Chatham Islands Datum 1979", "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": 4673 } }, "target_crs": { "type": "GeographicCRS", "name": "WGS 84", "datum_ensemble": { "name": "World Geodetic System 1984 ensemble", "members": [ { "name": "World Geodetic System 1984 (Transit)", "id": { "authority": "EPSG", "code": 1166 } }, { "name": "World Geodetic System 1984 (G730)", "id": { "authority": "EPSG", "code": 1152 } }, { "name": "World Geodetic System 1984 (G873)", "id": { "authority": "EPSG", "code": 1153 } }, { "name": "World Geodetic System 1984 (G1150)", "id": { "authority": "EPSG", "code": 1154 } }, { "name": "World Geodetic System 1984 (G1674)", "id": { "authority": "EPSG", "code": 1155 } }, { "name": "World Geodetic System 1984 (G1762)", "id": { "authority": "EPSG", "code": 1156 } }, { "name": "World Geodetic System 1984 (G2139)", "id": { "authority": "EPSG", "code": 1309 } } ], "ellipsoid": { "name": "WGS 84", "semi_major_axis": 6378137, "inverse_flattening": 298.257223563 }, "accuracy": "2.0", "id": { "authority": "EPSG", "code": 6326 } }, "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": 4326 } }, "transformation": { "name": "Transformation from unknown to WGS84", "method": { "name": "Position Vector transformation (geog2D domain)", "id": { "authority": "EPSG", "code": 9606 } }, "parameters": [ { "name": "X-axis translation", "value": 174.05, "unit": "metre", "id": { "authority": "EPSG", "code": 8605 } }, { "name": "Y-axis translation", "value": -25.49, "unit": "metre", "id": { "authority": "EPSG", "code": 8606 } }, { "name": "Z-axis translation", "value": 112.57, "unit": "metre", "id": { "authority": "EPSG", "code": 8607 } }, { "name": "X-axis rotation", "value": 0, "unit": { "type": "AngularUnit", "name": "arc-second", "conversion_factor": 4.84813681109536e-06 }, "id": { "authority": "EPSG", "code": 8608 } }, { "name": "Y-axis rotation", "value": 0, "unit": { "type": "AngularUnit", "name": "arc-second", "conversion_factor": 4.84813681109536e-06 }, "id": { "authority": "EPSG", "code": 8609 } }, { "name": "Z-axis rotation", "value": -0.554, "unit": { "type": "AngularUnit", "name": "arc-second", "conversion_factor": 4.84813681109536e-06 }, "id": { "authority": "EPSG", "code": 8610 } }, { "name": "Scale difference", "value": 0.2263, "unit": { "type": "ScaleUnit", "name": "parts per million", "conversion_factor": 1e-06 }, "id": { "authority": "EPSG", "code": 8611 } } ] } }
Definition: GeoServer
4673=GEOGCS["Chatham Islands 1979",DATUM["Chatham_Islands_Datum_1979",SPHEROID["International 1924",6378388,297],TOWGS84[174.05,-25.49,112.57,0,0,-0.554,0.2263]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4673"]]
Definition: Mapnik
<?xml version="1.0" encoding="utf-8"?> <Map srs="+proj=longlat +ellps=intl +towgs84=174.05,-25.49,112.57,0,0,-0.554,0.2263 +no_defs +type=crs"> <Layer srs="+proj=longlat +ellps=intl +towgs84=174.05,-25.49,112.57,0,0,-0.554,0.2263 +no_defs +type=crs"> </Layer> </Map>
Definition: SQL (PostGIS)
INSERT into spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext) values ( 4673, 'EPSG', 4673, '+proj=longlat +ellps=intl +towgs84=174.05,-25.49,112.57,0,0,-0.554,0.2263 +no_defs +type=crs', 'GEOGCS["Chatham Islands 1979",DATUM["Chatham_Islands_Datum_1979",SPHEROID["International 1924",6378388,297],TOWGS84[174.05,-25.49,112.57,0,0,-0.554,0.2263]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4673"]]');
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