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    EPSG reference

    EPSG:6646 — Karbala 1979 / Iraq National Grid

    Karbala 1979 / Iraq National Grid (EPSG:6646) — a Projected (metres) system on the a=6378249.145 datum, used in Iraq. Parameters, proj4, WKT, accuracy ±0.1 m, plus a fre…

    At a glance

    EPSG
    6646
    Name
    Karbala 1979 / Iraq National Grid
    Kind
    Projected (metres)
    Family
    Transverse Mercator (belt)
    Ellipsoid
    a=6378249.145
    Accuracy
    ±0.1 m (vs PROJ)
    Countries
    Iraq
    Convert from this system now

    Area of use

    West38.79°
    South29.06°
    East48.61°
    North37.39°

    Projection parameters

    Projectiontmerc
    Latitude of origin29.0262683333333
    Central meridian46.5
    Scale factor0.9994
    False easting800000
    False northing0
    Semi-major axis6378249.145
    Inverse flattening293.465
    Unitsm
    Helmert shift to WGS8470.995,-335.916,262.898,0,0,0,0
    proj4
    +proj=tmerc +lat_0=29.0262683333333 +lon_0=46.5 +k=0.9994 +x_0=800000 +y_0=0 +a=6378249.145 +rf=293.465 +units=m +no_defs +towgs84=70.995,-335.916,262.898,0,0,0,0
    WKT (ESRI)
    PROJCS["Karbala 1979 / Iraq National Grid",GEOGCS["GCS_Karbala 1979 / Iraq National Grid",DATUM["D_Custom_6378249.145",SPHEROID["Custom_6378249.145",6378249.145,293.465],TOWGS84[70.995,-335.916,262.898,0,0,0,0]],PRIMEM["Greenwich",0],UNIT["Degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER["False_Easting",800000],PARAMETER["False_Northing",0],PARAMETER["Central_Meridian",46.5],PARAMETER["Scale_Factor",0.9994],PARAMETER["Latitude_Of_Origin",29.0262683333333],UNIT["Meter",1],AUTHORITY["EPSG","6646"]]

    Sample conversion

    Iraq capital: WGS84 44.36610, 33.31520 → EPSG:6646 601676.063, 477242.630

    Values are within ±0.1 m at the test point.

    About the Transverse Mercator (belt) family

    Karbala 1979 / Iraq National Grid 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.

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    FAQ

    It is the coordinate system “Karbala 1979 / Iraq National Grid”, a Projected (metres) system in the Transverse Mercator (belt) family, identified worldwide by the code EPSG:6646.

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