Skip to main content
    GeoGiza
    Sign in
    EPSG reference

    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
    Convert from this system now

    Area of use

    West50.69°
    South24.55°
    East51.68°
    North26.20°

    Projection parameters

    Projectioncass
    Latitude of origin25.3823611111111
    Central meridian50.7613888888889
    False easting100000
    False northing100000
    Ellipsoidhelmert
    Unitsm
    proj4
    +proj=cass +lat_0=25.3823611111111 +lon_0=50.7613888888889 +x_0=100000 +y_0=100000 +ellps=helmert +units=m +no_defs
    WKT (ESRI)
    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

    Useful links: Converter · Batch converter · File converter · Country page

    Request technical support

    Need help with your survey project?

    Leave your email and our technical office will reach out for certified conversion and geodetic-adjustment support. The tool stays free, no sign-up.

    FAQ

    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.

    You may also need: Arab-world coordinate converter · Surveying file format converter · Batch coordinate file converter