EPSG:4285 — Qatar 1974
Qatar 1974 (EPSG:4285) — a Geographic (degrees) system on the intl datum, used in Qatar. Parameters, proj4, WKT, accuracy ±0.1 m, plus a free converter to WGS84 and UTM.
At a glance
- EPSG
- 4285
- Name
- Qatar 1974
- Kind
- Geographic (degrees)
- Family
- Geographic (longitude/latitude)
- Ellipsoid
- intl
- Accuracy
- ±0.1 m (vs PROJ)
- Countries
- Qatar
Area of use
| West | 50.55° |
| South | 24.55° |
| East | 53.04° |
| North | 27.05° |
Projection parameters
| Projection | longlat |
| Ellipsoid | intl |
| Helmert shift to WGS84 | -128.16,-282.42,21.93,0,0,0,0 |
+proj=longlat +ellps=intl +no_defs +towgs84=-128.16,-282.42,21.93,0,0,0,0
GEOGCS["GCS_Qatar 1974",DATUM["D_International_1924",SPHEROID["International_1924",6378388,297],TOWGS84[-128.16,-282.42,21.93,0,0,0,0]],PRIMEM["Greenwich",0],UNIT["Degree",0.0174532925199433],AUTHORITY["EPSG","4285"]]
Sample conversion
Qatar capital: WGS84 51.53100, 25.28540 → EPSG:4285 51.5317481, 25.2846968
Values are within ±0.1 m at the test point.
About the Geographic (longitude/latitude) family
Qatar 1974 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:2099 — Qatar 1948 / Qatar Grid
- EPSG:2932 — QND95 / Qatar National Grid
- EPSG:4286 — Qatar 1948
- EPSG:4614 — QND95
- EPSG:28600 — Qatar 1974 / Qatar National Grid
- EPSG:32639 — WGS 84 / UTM zone 39N
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