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    EPSG reference

    EPSG:3355 — Egypt Gulf of Suez S-650 TL / Red Belt

    Egypt Gulf of Suez S-650 TL / Red Belt (EPSG:3355) — a Projected (metres) system on the helmert datum, used in Egypt. Parameters, proj4, WKT, accuracy ±0.1 m, plus a fre…

    At a glance

    EPSG
    3355
    Name
    Egypt Gulf of Suez S-650 TL / Red Belt
    Kind
    Projected (metres)
    Family
    Transverse Mercator (belt)
    Ellipsoid
    helmert
    Accuracy
    ±0.1 m (vs PROJ)
    Countries
    Egypt
    Convert from this system now

    Area of use

    West32.34°
    South27.19°
    East34.27°
    North30.01°

    Projection parameters

    Projectiontmerc
    Latitude of origin30
    Central meridian31
    Scale factor1
    False easting615000
    False northing810000
    Ellipsoidhelmert
    Unitsm
    Helmert shift to WGS84-146.21,112.63,4.05,0,0,0,0
    proj4
    +proj=tmerc +lat_0=30 +lon_0=31 +k=1 +x_0=615000 +y_0=810000 +ellps=helmert +units=m +no_defs +towgs84=-146.21,112.63,4.05,0,0,0,0
    WKT (ESRI)
    PROJCS["Egypt Gulf of Suez S-650 TL / Red Belt",GEOGCS["GCS_Egypt Gulf of Suez S-650 TL / Red Belt",DATUM["D_Helmert_1906",SPHEROID["Helmert_1906",6378200,298.3],TOWGS84[-146.21,112.63,4.05,0,0,0,0]],PRIMEM["Greenwich",0],UNIT["Degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER["False_Easting",615000],PARAMETER["False_Northing",810000],PARAMETER["Central_Meridian",31],PARAMETER["Scale_Factor",1],PARAMETER["Latitude_Of_Origin",30],UNIT["Meter",1],AUTHORITY["EPSG","3355"]]

    Sample conversion

    Centre of the area of use: WGS84 33.30500, 28.60000 → EPSG:3355 840317.462, 656955.062

    Values are within ±0.1 m at the test point.

    About the Transverse Mercator (belt) family

    Egypt Gulf of Suez S-650 TL / Red 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 Gulf of Suez S-650 TL / Red Belt”, a Projected (metres) system in the Transverse Mercator (belt) family, identified worldwide by the code EPSG:3355.

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