EPSG:29871 Timbalai 1948 / RSO Borneo (ch)
Projected system (Hotine Oblique Mercator (variant B)) in use: Asia - Brunei and East Malaysia. The full definition below, and conversion in one click.
| Code | EPSG:29871 |
|---|---|
| Name | Timbalai 1948 / RSO Borneo (ch) |
| Type | Projected system — Hotine Oblique Mercator (variant B) |
| Area of use |
Asia - Brunei and East Malaysia Brunei - onshore and offshore; Malaysia - East Malaysia (Sabah; Sarawak) - onshore and offshore. |
| Bounds | W 109,31° · S 0,85° · E 119,61° · N 7,67° |
| Countries | Brunei, Malaysia |
| Datum | Timbalai 1948 |
| Ellipsoid | Everest 1830 (1967 Definition) a = 6377298.556 m · 1/f = 300.8017 |
| Base geographic system | EPSG:4298 — Timbalai 1948 |
| Unit | British chain (Sears 1922) (E east, N north) |
| Transformation to WGS 84 | Timbalai 1948 to WGS 84 (1) (EPSG:1228) — accuracy 19 m |
| Scope | Engineering survey, topographic mapping. |
Projection parameters
| Parameter | Value | Unit |
|---|---|---|
| Latitude of projection centre | 4 | degree |
| Longitude of projection centre | 115 | degree |
| Azimuth at projection centre | 53.31582047222222 | degree |
| Angle from Rectified to Skew Grid | 53.13010236111111 | degree |
| Scale factor at projection centre | 0.99984 | unity |
| Easting at projection centre | 29352.4763 | British chain (Sears 1922) |
| Northing at projection centre | 22014.3572 | British chain (Sears 1922) |
proj4 definition
+proj=omerc +lat_0=4 +lonc=115 +alpha=53.3158204722222 +gamma=53.1301023611111 +k=0.99984 +x_0=590476.87146304 +y_0=442857.653094361 +ellps=evrstSS +to_meter=20.1167651215526 +towgs84=-679,669,-48 +no_defsPaste it into QGIS, proj4js, PostGIS (spatial_ref_sys) or GDAL. +towgs84 carries the EPSG transformation to WGS 84; the official code stays EPSG:29871.
WKT (ESRI format, the .prj content)
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]]Other systems — Brunei
Source: EPSG registry v11.022 (IOGP), through the PROJ database. Always check a code on epsg.org before contractual work.