EPSG:2099 — Qatar 1948 / Qatar Grid
Qatar 1948 / Qatar Grid (EPSG:2099) — a Projected (metres) system on the helmert datum, used in Qatar. Parameters, proj4, WKT, accuracy ±0.1 m, plus a free converter to…
At a glance
- EPSG
- 2099
- Name
- Qatar 1948 / Qatar Grid
- Kind
- Projected (metres)
- Family
- Cassini–Soldner
- Ellipsoid
- helmert
- Accuracy
- ±0.1 m (vs PROJ)
- Countries
- Qatar
Area of use
| West | 50.69° |
| South | 24.55° |
| East | 51.68° |
| North | 26.20° |
Projection parameters
| Projection | cass |
| Latitude of origin | 25.3823611111111 |
| Central meridian | 50.7613888888889 |
| False easting | 100000 |
| False northing | 100000 |
| Ellipsoid | helmert |
| Units | m |
+proj=cass +lat_0=25.3823611111111 +lon_0=50.7613888888889 +x_0=100000 +y_0=100000 +ellps=helmert +units=m +no_defs
PROJCS["Qatar 1948 / Qatar Grid",GEOGCS["GCS_Qatar 1948 / Qatar Grid",DATUM["D_Helmert_1906",SPHEROID["Helmert_1906",6378200,298.3]],PRIMEM["Greenwich",0],UNIT["Degree",0.0174532925199433]],PROJECTION["Cassini"],PARAMETER["False_Easting",100000],PARAMETER["False_Northing",100000],PARAMETER["Central_Meridian",50.7613888888889],PARAMETER["Latitude_Of_Origin",25.3823611111111],UNIT["Meter",1],AUTHORITY["EPSG","2099"]]
Sample conversion
Qatar capital: WGS84 51.53100, 25.28540 → EPSG:2099 177512.217, 89481.109
Values are within ±0.1 m at the test point.
About the Cassini–Soldner family
Qatar 1948 / Qatar Grid uses the Cassini–Soldner projection — a historical belt grid, in metres, that is NOT conformal: scale depends on direction, so angles and shapes are slightly distorted away from the central meridian. Several Palestine and Bahrain cadastral grids are Cassini.
Because it is non-conformal, a single "scale factor" is not enough — the scale differs along and across the meridian. Treat legacy Cassini coordinates carefully, and reproject to a modern conformal system for GIS work.
Related systems
- EPSG:2932 — QND95 / Qatar National Grid
- EPSG:4285 — Qatar 1974
- EPSG:4286 — Qatar 1948
- EPSG:4614 — QND95
- EPSG:28600 — Qatar 1974 / Qatar National Grid
- EPSG:32639 — WGS 84 / UTM zone 39N
Useful links: Converter · Batch converter · File converter · Country page
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FAQ
- What is EPSG:2099?
- It is the coordinate system “Qatar 1948 / Qatar Grid”, a Projected (metres) system in the Cassini–Soldner family, identified worldwide by the code EPSG:2099.
- What datum does it use, and how accurate is it?
- It is based on the helmert ellipsoid with no default transform to WGS84 (ballpark). 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 Qatar. This page shows its area of use as a coordinate rectangle above.
- How do I convert EPSG:2099 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