EPSG:3168 Kertau (RSO) / RSO Malaya (m)
Projected system (Hotine Oblique Mercator (variant A)) in use: Malaysia - West Malaysia - onshore. The full definition below, and conversion in one click.
EPSG publishes no simple transformation to WGS 84 for this datum: conversion works on the ellipsoid alone and can be off by tens of metres.
| Code | EPSG:3168 |
|---|---|
| Name | Kertau (RSO) / RSO Malaya (m) |
| Type | Projected system — Hotine Oblique Mercator (variant A) |
| Area of use |
Malaysia - West Malaysia - onshore Malaysia - West Malaysia onshore. |
| Bounds | W 99,59° · S 1,21° · E 104,60° · N 6,72° |
| Countries | Malaysia |
| Datum | Kertau (RSO) |
| Ellipsoid | Everest 1830 (RSO 1969) a = 6377295.664 m · 1/f = 300.8017 |
| Base geographic system | EPSG:4751 — Kertau (RSO) |
| Unit | metre (E east, N north) |
| Transformation to WGS 84 | No simple transformation published (ellipsoid alone) |
| Scope | Engineering survey, topographic mapping. |
Projection parameters
| Parameter | Value | Unit |
|---|---|---|
| Latitude of projection centre | 4 | degree |
| Longitude of projection centre | 102.25 | degree |
| Azimuth at projection centre | 323.02579049999997 | degree |
| Angle from Rectified to Skew Grid | 323.13010236111114 | degree |
| Scale factor at projection centre | 0.99984 | unity |
| False easting | 804670.24 | metre |
| False northing | 0 | metre |
proj4 definition
+proj=omerc +no_uoff +lat_0=4 +lonc=102.25 +alpha=323.0257905 +gamma=323.130102361111 +k=0.99984 +x_0=804670.24 +y_0=0 +ellps=evrst69 +units=m +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:3168.
WKT (ESRI format, the .prj content)
PROJCS["Kertau_RSO_RSO_Malaya",GEOGCS["GCS_Kertau_RSO",DATUM["D_Kertau_RSO",SPHEROID["Everest_Modified_1969",6377295.664,300.8017]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Rectified_Skew_Orthomorphic_Natural_Origin"],PARAMETER["False_Easting",804670.24],PARAMETER["False_Northing",0.0],PARAMETER["Scale_Factor",0.99984],PARAMETER["Azimuth",-36.9742095],PARAMETER["Longitude_Of_Center",102.25],PARAMETER["Latitude_Of_Center",4.0],PARAMETER["XY_Plane_Rotation",-36.8698976388889],UNIT["Meter",1.0]]Other systems — Malaysia
- EPSG:3167Kertau (RSO) / RSO Malaya (ch)
- EPSG:3375GDM2000 / Peninsula RSO
- EPSG:3376GDM2000 / East Malaysia BRSO
- EPSG:3377GDM2000 / Johor Grid
- EPSG:3378GDM2000 / Sembilan and Melaka Grid
- EPSG:3379GDM2000 / Pahang Grid
- EPSG:3380GDM2000 / Selangor Grid
- EPSG:3381GDM2000 / Terengganu Grid
- EPSG:3382GDM2000 / Pinang Grid
- EPSG:3383GDM2000 / Kedah and Perlis Grid
- EPSG:3384GDM2000 / Perak Grid
- EPSG:3385GDM2000 / Kelantan Grid
- EPSG:4245Kertau 1968
- EPSG:4298Timbalai 1948
- EPSG:4390Kertau 1968 / Johor Grid
- EPSG:4391Kertau 1968 / Sembilan and Melaka Grid
- EPSG:4392Kertau 1968 / Pahang Grid
- EPSG:4393Kertau 1968 / Selangor Grid
Source: EPSG registry v11.022 (IOGP), through the PROJ database. Always check a code on epsg.org before contractual work.