EPSG:6881 — Aden 1925
Aden 1925 (EPSG:6881) — a Geographic (degrees) system on the a=6378249.145 datum, used in Yemen. Parameters, proj4, WKT, accuracy ±0.1 m, plus a free converter to WGS84…
At a glance
- EPSG
- 6881
- Name
- Aden 1925
- Kind
- Geographic (degrees)
- Family
- Geographic (longitude/latitude)
- Ellipsoid
- a=6378249.145
- Accuracy
- ±0.1 m (vs PROJ)
- Countries
- Yemen
Area of use
| West | 43.37° |
| South | 12.54° |
| East | 53.14° |
| North | 19.00° |
Projection parameters
| Projection | longlat |
| Semi-major axis | 6378249.145 |
| Inverse flattening | 293.465 |
| Helmert shift to WGS84 | -24,-203,268,0,0,0,0 |
+proj=longlat +a=6378249.145 +rf=293.465 +no_defs +towgs84=-24,-203,268,0,0,0,0
GEOGCS["GCS_Aden 1925",DATUM["D_Custom_6378249.145",SPHEROID["Custom_6378249.145",6378249.145,293.465],TOWGS84[-24,-203,268,0,0,0,0]],PRIMEM["Greenwich",0],UNIT["Degree",0.0174532925199433],AUTHORITY["EPSG","6881"]]
Sample conversion
Yemen capital: WGS84 44.19100, 15.36940 → EPSG:6881 44.1921999, 15.3682945
Values are within ±0.1 m at the test point.
About the Geographic (longitude/latitude) family
Aden 1925 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:2089 — Yemen NGN96 / UTM zone 38N
- EPSG:2090 — Yemen NGN96 / UTM zone 39N
- EPSG:2395 — South Yemen / Gauss-Kruger zone 8
- EPSG:2396 — South Yemen / Gauss-Kruger zone 9
- EPSG:4163 — Yemen NGN96
- EPSG:4164 — South Yemen
- EPSG:32638 — WGS 84 / UTM zone 38N
- EPSG:32639 — WGS 84 / UTM zone 39N
Useful links: Converter · Batch converter · File converter · Country page
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FAQ
- What is EPSG:6881?
- It is the coordinate system “Aden 1925”, a Geographic (degrees) system in the Geographic (longitude/latitude) family, identified worldwide by the code EPSG:6881.
- 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 Yemen. This page shows its area of use as a coordinate rectangle above.
- How do I convert EPSG:6881 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