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    EPSG reference

    EPSG:22994 — Egypt 1907 / Extended Purple Belt

    Egypt 1907 / Extended Purple Belt (EPSG:22994) — a Projected (metres) system on the helmert datum, used in Egypt. Parameters, proj4, WKT, accuracy ±5 m, plus a free conv…

    At a glance

    EPSG
    22994
    Name
    Egypt 1907 / Extended Purple Belt
    Kind
    Projected (metres)
    Family
    Transverse Mercator (belt)
    Ellipsoid
    helmert
    Accuracy
    ±5 m (vs PROJ)
    Countries
    Egypt
    Convert from this system now

    Area of use

    West24.99°
    South21.99°
    East29.01°
    North28.19°

    Projection parameters

    Projectiontmerc
    Latitude of origin30
    Central meridian27
    Scale factor1
    False easting700000
    False northing1200000
    Ellipsoidhelmert
    Unitsm
    Helmert shift to WGS84-130,110,-13,0,0,0,0
    proj4
    +proj=tmerc +lat_0=30 +lon_0=27 +k=1 +x_0=700000 +y_0=1200000 +ellps=helmert +units=m +no_defs +towgs84=-130,110,-13,0,0,0,0
    WKT (ESRI)
    PROJCS["Egypt 1907 / Extended Purple Belt",GEOGCS["GCS_Egypt 1907 / Extended Purple Belt",DATUM["D_Helmert_1906",SPHEROID["Helmert_1906",6378200,298.3],TOWGS84[-130,110,-13,0,0,0,0]],PRIMEM["Greenwich",0],UNIT["Degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER["False_Easting",700000],PARAMETER["False_Northing",1200000],PARAMETER["Central_Meridian",27],PARAMETER["Scale_Factor",1],PARAMETER["Latitude_Of_Origin",30],UNIT["Meter",1],AUTHORITY["EPSG","22994"]]

    Sample conversion

    Centre of the area of use: WGS84 27.00000, 25.09000 → EPSG:22994 699842.971, 655886.304

    Values are within ±5 m at the test point.

    About the Transverse Mercator (belt) family

    Egypt 1907 / Extended Purple Belt is a Transverse Mercator belt — a national or cadastral grid in metres, conformal (angles are preserved), with its own central meridian and scale factor. Egypt's Red/Purple/Blue belts, the Levant grids, and many Gulf cadastral systems are of this kind.

    Two things decide whether your coordinates land correctly: the exact belt (central meridian) and the datum. Mixing a coordinate from one belt into another, or ignoring the datum shift to WGS 84, is the usual cause of a systematic offset in imported survey data.

    Related systems

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    FAQ

    It is the coordinate system “Egypt 1907 / Extended Purple Belt”, a Projected (metres) system in the Transverse Mercator (belt) family, identified worldwide by the code EPSG:22994.

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