EPSG:4246 — KOC (Clarke 1880 RGS variant)
KOC (Clarke 1880 RGS variant) (EPSG:4246) — a Geographic (degrees) system on the a=6378249.145 datum, used in Kuwait. Parameters, proj4, WKT, accuracy ±0.1 m, plus a fre…
At a glance
- EPSG
- 4246
- Name
- KOC (Clarke 1880 RGS variant)
- Kind
- Geographic (degrees)
- Family
- Geographic (longitude/latitude)
- Ellipsoid
- a=6378249.145
- Accuracy
- ±0.1 m (vs PROJ)
- Countries
- Kuwait
Area of use
| West | 46.54° |
| South | 28.53° |
| East | 48.48° |
| North | 30.09° |
Projection parameters
| Projection | longlat |
| Semi-major axis | 6378249.145 |
| Inverse flattening | 293.465 |
| Helmert shift to WGS84 | -294.7,-200.1,525.5,0,0,0,0 |
+proj=longlat +a=6378249.145 +rf=293.465 +no_defs +towgs84=-294.7,-200.1,525.5,0,0,0,0
GEOGCS["GCS_KOC (Clarke 1880 RGS variant)",DATUM["D_Custom_6378249.145",SPHEROID["Custom_6378249.145",6378249.145,293.465],TOWGS84[-294.7,-200.1,525.5,0,0,0,0]],PRIMEM["Greenwich",0],UNIT["Degree",0.0174532925199433],AUTHORITY["EPSG","4246"]]
Sample conversion
Kuwait capital: WGS84 47.97740, 29.37590 → EPSG:4246 47.9765248, 29.3729292
Values are within ±0.1 m at the test point.
About the Geographic (longitude/latitude) family
KOC (Clarke 1880 RGS variant) is a geographic coordinate system: positions are longitude and latitude in degrees on its reference ellipsoid, not metres on a plane. It is the datum layer that projected grids (UTM, national belts) are built upon.
Because it is unprojected, distances and areas cannot be measured directly from its degrees — convert to a metric projected system (or use a geodesic calculation) first. This page's converter does exactly that.
Related systems
- EPSG:4318 — NGN
- EPSG:4319 — KOC
- EPSG:24600 — KOC Lambert
- EPSG:31838 — NGN / UTM zone 38N
- EPSG:31839 — NGN / UTM zone 39N
- EPSG:31901 — KUDAMS / KTM
- EPSG:32638 — WGS 84 / UTM zone 38N
- EPSG:32639 — WGS 84 / UTM zone 39N
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FAQ
- What is EPSG:4246?
- It is the coordinate system “KOC (Clarke 1880 RGS variant)”, a Geographic (degrees) system in the Geographic (longitude/latitude) family, identified worldwide by the code EPSG:4246.
- What datum does it use, and how accurate is it?
- It is based on the a=6378249.145 ellipsoid and it carries Helmert parameters to WGS84. The residual at the test point is about ±0.1 m versus PROJ; for centimetre work use a geodetic adjustment service.
- Where is this system used?
- It is used in Kuwait. This page shows its area of use as a coordinate rectangle above.
- How do I convert EPSG:4246 to WGS84?
- Use the free coordinate converter above (preloaded with this system) to convert to WGS84, UTM, or any other system, within a ±0.1 m residual.
You may also need: Arab-world coordinate converter · Surveying file format converter · Batch coordinate file converter