EPSG:4646 — Grand Comoros
Grand Comoros (EPSG:4646) — a Geographic (degrees) system on the intl datum, used in Comoros. Parameters, proj4, WKT, accuracy ±0.1 m, plus a free converter to WGS84 and…
At a glance
- EPSG
- 4646
- Name
- Grand Comoros
- Kind
- Geographic (degrees)
- Family
- Geographic (longitude/latitude)
- Ellipsoid
- intl
- Accuracy
- ±0.1 m (vs PROJ)
- Countries
- Comoros
Area of use
| West | 43.16° |
| South | -11.99° |
| East | 43.55° |
| North | -11.31° |
Projection parameters
| Projection | longlat |
| Ellipsoid | intl |
| Helmert shift to WGS84 | -963,510,-359,0,0,0,0 |
+proj=longlat +ellps=intl +no_defs +towgs84=-963,510,-359,0,0,0,0
GEOGCS["GCS_Grand Comoros",DATUM["D_International_1924",SPHEROID["International_1924",6378388,297],TOWGS84[-963,510,-359,0,0,0,0]],PRIMEM["Greenwich",0],UNIT["Degree",0.0174532925199433],AUTHORITY["EPSG","4646"]]
Sample conversion
Centre of the area of use: WGS84 43.35500, -11.65000 → EPSG:4646 43.3455367, -11.6465080
Values are within ±0.1 m at the test point.
About the Geographic (longitude/latitude) family
Grand Comoros 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.
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