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Method: Geocentric translations (geog2D domain)
Remarks: CARE! Erroneous GPS data was used in the derivation of these parameters. They produce a coordinate difference of 10m horizontally and 50m vertically compared to Timbalai 1948 to WGS 84 (2) (code 1592).
Information source: Brunei Survey Department
Revision date: 2020-03-14
Unit: British chain (Sears 1922)
Geodetic CRS: Timbalai 1948
Datum: Timbalai 1948
Ellipsoid: Everest 1830 (1967 Definition)
Prime meridian: Greenwich
Data source: EPSG
Information source: Defence Geographic Centre.
Revision date: 2022-11-29
Scope: Engineering survey, topographic mapping.
Remarks: Adopts ellipsoid metric conversion of 39.370147 inches per metre. Replaced by metric projection version (CRS code 29873). See also foot version (CRS code 29872) for Shell ops in E Malaysia.
Area of use: Brunei - onshore and offshore; Malaysia - East Malaysia (Sabah; Sarawak) - onshore and offshore.
Coordinate system: Cartesian 2D CS. Axes: easting, northing (E,N). Orientations: east, north. UoM: chSe.
&stroke=red&width=2&path=4.01,114.09|5.11,114.09|5.11,115.37|4.01,115.37|4.01,114.09)
Center coordinates
27835.34 25092.05
Projected bounds:
24298.87 22060.1
31376.52 28126.65
WGS84 bounds:
114.09 4.01
115.37 5.11
Definition: OGC Well Known Text
PROJCS["Timbalai 1948 / RSO Borneo (ch)", GEOGCS["Timbalai 1948", DATUM["Timbalai_1948", SPHEROID["Everest 1830 (1967 Definition)",6377298.556,300.8017], TOWGS84[-726.282,703.611,-48.999,0,0,0,0]], PRIMEM["Greenwich",0, AUTHORITY["EPSG","8901"]], UNIT["degree",0.0174532925199433, AUTHORITY["EPSG","9122"]], AUTHORITY["EPSG","4298"]], PROJECTION["Hotine_Oblique_Mercator_Azimuth_Center"], PARAMETER["latitude_of_center",4], PARAMETER["longitude_of_center",115], PARAMETER["azimuth",53.3158204722222], PARAMETER["rectified_grid_angle",53.1301023611111], PARAMETER["scale_factor",0.99984], PARAMETER["false_easting",29352.4763], PARAMETER["false_northing",22014.3572], UNIT["British chain (Sears 1922)",20.1167651215526], AXIS["Easting",EAST], AXIS["Northing",NORTH], AUTHORITY["EPSG","29871"]]
Definition: OGC Well Known Text 2 (2019)
BOUNDCRS[ SOURCECRS[ PROJCRS["Timbalai 1948 / RSO Borneo (ch)", BASEGEOGCRS["Timbalai 1948", DATUM["Timbalai 1948", ELLIPSOID["Everest 1830 (1967 Definition)",6377298.556,300.8017, LENGTHUNIT["metre",1]]], PRIMEM["Greenwich",0, ANGLEUNIT["degree",0.0174532925199433]], ID["EPSG",4298]], CONVERSION["Rectified Skew Orthomorphic Borneo Grid (chain)", METHOD["Hotine Oblique Mercator (variant B)", ID["EPSG",9815]], PARAMETER["Latitude of projection centre",4, ANGLEUNIT["degree",0.0174532925199433], ID["EPSG",8811]], PARAMETER["Longitude of projection centre",115, ANGLEUNIT["degree",0.0174532925199433], ID["EPSG",8812]], PARAMETER["Azimuth of initial line",53.3158204722222, ANGLEUNIT["degree",0.0174532925199433], ID["EPSG",8813]], PARAMETER["Angle from Rectified to Skew Grid",53.1301023611111, ANGLEUNIT["degree",0.0174532925199433], ID["EPSG",8814]], PARAMETER["Scale factor on initial line",0.99984, SCALEUNIT["unity",1], ID["EPSG",8815]], PARAMETER["Easting at projection centre",29352.4763, LENGTHUNIT["British chain (Sears 1922)",20.1167651215526], ID["EPSG",8816]], PARAMETER["Northing at projection centre",22014.3572, LENGTHUNIT["British chain (Sears 1922)",20.1167651215526], ID["EPSG",8817]]], CS[Cartesian,2], AXIS["(E)",east, ORDER[1], LENGTHUNIT["British chain (Sears 1922)",20.1167651215526]], AXIS["(N)",north, ORDER[2], LENGTHUNIT["British chain (Sears 1922)",20.1167651215526]], USAGE[ SCOPE["Engineering survey, topographic mapping."], AREA["Brunei - onshore and offshore; Malaysia - East Malaysia (Sabah; Sarawak) - onshore and offshore."], BBOX[0.85,109.31,7.67,119.61]], ID["EPSG",29871]]], 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",-726.282, ID["EPSG",8605]], PARAMETER["Y-axis translation",703.611, ID["EPSG",8606]], PARAMETER["Z-axis translation",-48.999, ID["EPSG",8607]], PARAMETER["X-axis rotation",0, ID["EPSG",8608]], PARAMETER["Y-axis rotation",0, ID["EPSG",8609]], PARAMETER["Z-axis rotation",0, ID["EPSG",8610]], PARAMETER["Scale difference",1, ID["EPSG",8611]]]]
Definition: ESRI Well Known Text
PROJCS["Timbalai_1948_RSO_Borneo_Chains", GEOGCS["GCS_Timbalai_1948", DATUM["D_Timbalai_1948", SPHEROID["Everest_Definition_1967",6377298.556,300.8017]], PRIMEM["Greenwich",0.0], UNIT["Degree",0.0174532925199433]], PROJECTION["Rectified_Skew_Orthomorphic_Center"], PARAMETER["False_Easting",29352.4763], PARAMETER["False_Northing",22014.3572], PARAMETER["Scale_Factor",0.99984], PARAMETER["Azimuth",53.3158204722222], PARAMETER["Longitude_Of_Center",115.0], PARAMETER["Latitude_Of_Center",4.0], PARAMETER["XY_Plane_Rotation",53.1301023611111], UNIT["British chain (Sears 1922)",20.1167651215526]]
Definition: JavaScript (Proj4js)
proj4.defs("EPSG:29871","+proj=omerc +lat_0=4 +lonc=115 +alpha=53.3158204722222 +gamma=53.1301023611111 +k=0.99984 +x_0=590476.871463039 +y_0=442857.65309436 +ellps=evrstSS +towgs84=-726.282,703.611,-48.999,0,0,0,0 +to_meter=20.1167651215526 +no_defs +type=crs");
Definition: JSON
{ "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json", "type": "BoundCRS", "source_crs": { "type": "ProjectedCRS", "name": "Timbalai 1948 / RSO Borneo (ch)", "base_crs": { "name": "Timbalai 1948", "datum": { "type": "GeodeticReferenceFrame", "name": "Timbalai 1948", "ellipsoid": { "name": "Everest 1830 (1967 Definition)", "semi_major_axis": 6377298.556, "inverse_flattening": 300.8017 } }, "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": 4298 } }, "conversion": { "name": "Rectified Skew Orthomorphic Borneo Grid (chain)", "method": { "name": "Hotine Oblique Mercator (variant B)", "id": { "authority": "EPSG", "code": 9815 } }, "parameters": [ { "name": "Latitude of projection centre", "value": 4, "unit": "degree", "id": { "authority": "EPSG", "code": 8811 } }, { "name": "Longitude of projection centre", "value": 115, "unit": "degree", "id": { "authority": "EPSG", "code": 8812 } }, { "name": "Azimuth of initial line", "value": 53.3158204722222, "unit": "degree", "id": { "authority": "EPSG", "code": 8813 } }, { "name": "Angle from Rectified to Skew Grid", "value": 53.1301023611111, "unit": "degree", "id": { "authority": "EPSG", "code": 8814 } }, { "name": "Scale factor on initial line", "value": 0.99984, "unit": "unity", "id": { "authority": "EPSG", "code": 8815 } }, { "name": "Easting at projection centre", "value": 29352.4763, "unit": { "type": "LinearUnit", "name": "British chain (Sears 1922)", "conversion_factor": 20.1167651215526 }, "id": { "authority": "EPSG", "code": 8816 } }, { "name": "Northing at projection centre", "value": 22014.3572, "unit": { "type": "LinearUnit", "name": "British chain (Sears 1922)", "conversion_factor": 20.1167651215526 }, "id": { "authority": "EPSG", "code": 8817 } } ] }, "coordinate_system": { "subtype": "Cartesian", "axis": [ { "name": "Easting", "abbreviation": "E", "direction": "east", "unit": { "type": "LinearUnit", "name": "British chain (Sears 1922)", "conversion_factor": 20.1167651215526 } }, { "name": "Northing", "abbreviation": "N", "direction": "north", "unit": { "type": "LinearUnit", "name": "British chain (Sears 1922)", "conversion_factor": 20.1167651215526 } } ] }, "id": { "authority": "EPSG", "code": 29871 } }, "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": -726.282, "unit": "metre", "id": { "authority": "EPSG", "code": 8605 } }, { "name": "Y-axis translation", "value": 703.611, "unit": "metre", "id": { "authority": "EPSG", "code": 8606 } }, { "name": "Z-axis translation", "value": -48.999, "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, "unit": { "type": "AngularUnit", "name": "arc-second", "conversion_factor": 4.84813681109536e-06 }, "id": { "authority": "EPSG", "code": 8610 } }, { "name": "Scale difference", "value": 0, "unit": { "type": "ScaleUnit", "name": "parts per million", "conversion_factor": 1e-06 }, "id": { "authority": "EPSG", "code": 8611 } } ] } }
Definition: GeoServer
29871=PROJCS["Timbalai 1948 / RSO Borneo (ch)",GEOGCS["Timbalai 1948",DATUM["Timbalai_1948",SPHEROID["Everest 1830 (1967 Definition)",6377298.556,300.8017],TOWGS84[-726.282,703.611,-48.999,0,0,0,0]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4298"]],PROJECTION["Hotine_Oblique_Mercator_Azimuth_Center"],PARAMETER["latitude_of_center",4],PARAMETER["longitude_of_center",115],PARAMETER["azimuth",53.3158204722222],PARAMETER["rectified_grid_angle",53.1301023611111],PARAMETER["scale_factor",0.99984],PARAMETER["false_easting",29352.4763],PARAMETER["false_northing",22014.3572],UNIT["British chain (Sears 1922)",20.1167651215526],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","29871"]]
Definition: MapServer - MAPfile
PROJECTION "proj=omerc" "lat_0=4" "lonc=115" "alpha=53.3158204722222" "gamma=53.1301023611111" "k=0.99984" "x_0=590476.871463039" "y_0=442857.65309436" "ellps=evrstSS" "towgs84=-726.282,703.611,-48.999,0,0,0,0" "to_meter=20.1167651215526" "no_defs" "type=crs" END
Definition: Mapnik
<?xml version="1.0" encoding="utf-8"?> <Map srs="+proj=omerc +lat_0=4 +lonc=115 +alpha=53.3158204722222 +gamma=53.1301023611111 +k=0.99984 +x_0=590476.871463039 +y_0=442857.65309436 +ellps=evrstSS +towgs84=-726.282,703.611,-48.999,0,0,0,0 +to_meter=20.1167651215526 +no_defs +type=crs"> <Layer srs="+proj=omerc +lat_0=4 +lonc=115 +alpha=53.3158204722222 +gamma=53.1301023611111 +k=0.99984 +x_0=590476.871463039 +y_0=442857.65309436 +ellps=evrstSS +towgs84=-726.282,703.611,-48.999,0,0,0,0 +to_meter=20.1167651215526 +no_defs +type=crs"> </Layer> </Map>
Definition: SQL (PostGIS)
INSERT into spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext) values ( 29871, 'EPSG', 29871, '+proj=omerc +lat_0=4 +lonc=115 +alpha=53.3158204722222 +gamma=53.1301023611111 +k=0.99984 +x_0=590476.871463039 +y_0=442857.65309436 +ellps=evrstSS +towgs84=-726.282,703.611,-48.999,0,0,0,0 +to_meter=20.1167651215526 +no_defs +type=crs', 'PROJCS["Timbalai 1948 / RSO Borneo (ch)",GEOGCS["Timbalai 1948",DATUM["Timbalai_1948",SPHEROID["Everest 1830 (1967 Definition)",6377298.556,300.8017],TOWGS84[-726.282,703.611,-48.999,0,0,0,0]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4298"]],PROJECTION["Hotine_Oblique_Mercator_Azimuth_Center"],PARAMETER["latitude_of_center",4],PARAMETER["longitude_of_center",115],PARAMETER["azimuth",53.3158204722222],PARAMETER["rectified_grid_angle",53.1301023611111],PARAMETER["scale_factor",0.99984],PARAMETER["false_easting",29352.4763],PARAMETER["false_northing",22014.3572],UNIT["British chain (Sears 1922)",20.1167651215526],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","29871"]]');
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