EPSG:4201 — Adindan
Adindan (EPSG:4201) — a Geographic (degrees) system on the a=6378249.145 datum, used in Sudan. Parameters, proj4, WKT, accuracy ±3 m, plus a free converter to WGS84 and…
At a glance
- EPSG
- 4201
- Name
- Adindan
- Kind
- Geographic (degrees)
- Family
- Geographic (longitude/latitude)
- Ellipsoid
- a=6378249.145
- Accuracy
- ±3 m (vs PROJ)
- Countries
- Sudan
Area of use
| West | 21.82° |
| South | 3.40° |
| East | 47.99° |
| North | 22.24° |
Projection parameters
| Projection | longlat |
| Semi-major axis | 6378249.145 |
| Inverse flattening | 293.465 |
| Helmert shift to WGS84 | -166,-15,204,0,0,0,0 |
+proj=longlat +a=6378249.145 +rf=293.465 +no_defs +towgs84=-166,-15,204,0,0,0,0
GEOGCS["GCS_Adindan",DATUM["D_Custom_6378249.145",SPHEROID["Custom_6378249.145",6378249.145,293.465],TOWGS84[-166,-15,204,0,0,0,0]],PRIMEM["Greenwich",0],UNIT["Degree",0.0174532925199433],AUTHORITY["EPSG","4201"]]
Sample conversion
Sudan capital: WGS84 32.55990, 15.50070 → EPSG:4201 32.5591852, 15.5001885
Values are within ±3 m at the test point.
About the Geographic (longitude/latitude) family
Adindan 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:4262 — Massawa
- EPSG:20135 — Adindan / UTM zone 35N
- EPSG:20136 — Adindan / UTM zone 36N
- EPSG:20137 — Adindan / UTM zone 37N
- EPSG:20138 — Adindan / UTM zone 38N
- EPSG:26237 — Massawa / UTM zone 37N
- EPSG:32634 — WGS 84 / UTM zone 34N
- EPSG:32635 — WGS 84 / UTM zone 35N
- EPSG:32636 — WGS 84 / UTM zone 36N
- EPSG:32637 — WGS 84 / UTM zone 37N
Useful links: Converter · Batch converter · File converter · Country page
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FAQ
- What is EPSG:4201?
- It is the coordinate system “Adindan”, a Geographic (degrees) system in the Geographic (longitude/latitude) family, identified worldwide by the code EPSG:4201.
- 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 ±3 m versus PROJ; for centimetre work use a geodetic adjustment service.
- Where is this system used?
- It is used in Sudan. This page shows its area of use as a coordinate rectangle above.
- How do I convert EPSG:4201 to WGS84?
- Use the free coordinate converter above (preloaded with this system) to convert to WGS84, UTM, or any other system, within a ±3 m residual.
You may also need: Arab-world coordinate converter · Surveying file format converter · Batch coordinate file converter