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    EPSG reference

    EPSG:20138 — Adindan / UTM zone 38N

    Adindan / UTM zone 38N (EPSG:20138) — a Projected (metres) system on the a=6378249.145 datum, used in Sudan. Parameters, proj4, WKT, accuracy ±2.6 m, plus a free convert…

    At a glance

    EPSG
    20138
    Name
    Adindan / UTM zone 38N
    Kind
    Projected (metres)
    Family
    Universal Transverse Mercator (UTM)
    Ellipsoid
    a=6378249.145
    Accuracy
    ±2.6 m (vs PROJ)
    Countries
    Sudan
    Convert from this system now

    Area of use

    West42.00°
    South4.11°
    East47.99°
    North12.85°

    Projection parameters

    Projectionutm
    UTM zone38
    Semi-major axis6378249.145
    Inverse flattening293.465
    Unitsm
    Helmert shift to WGS84-166,-15,204,0,0,0,0
    proj4
    +proj=utm +zone=38 +a=6378249.145 +rf=293.465 +units=m +no_defs +towgs84=-166,-15,204,0,0,0,0
    WKT (ESRI)
    PROJCS["Adindan / UTM zone 38N",GEOGCS["GCS_Adindan / UTM zone 38N",DATUM["D_Custom_6378249.145",SPHEROID["Custom_6378249.145",6378249.145,293.465],TOWGS84[-166,-15,204,0,0,0,0]],PRIMEM["Greenwich",0],UNIT["Degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER["False_Easting",500000],PARAMETER["False_Northing",0],PARAMETER["Central_Meridian",45],PARAMETER["Scale_Factor",0.9996],PARAMETER["Latitude_Of_Origin",0],UNIT["Meter",1],AUTHORITY["EPSG","20138"]]

    Sample conversion

    Centre of the area of use: WGS84 44.99500, 8.48000 → EPSG:20138 499342.937, 937158.886

    Values are within ±2.6 m at the test point.

    About the Universal Transverse Mercator (UTM) family

    Adindan / UTM zone 38N is a Universal Transverse Mercator zone — a 6°-wide belt of the worldwide UTM system, in metres, centred on a meridian carefully chosen so distortion stays low across the zone. It is the everyday working grid for GPS-derived surveying in Sudan.

    The classic field mistake with UTM is using the wrong zone: a point one zone away is easily hundreds of kilometres off. Always confirm the zone number (and the hemisphere) before importing coordinates, and remember that UTM eastings are offset by a 500 km false easting so they never go negative.

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    FAQ

    What is EPSG:20138?
    It is the coordinate system “Adindan / UTM zone 38N”, a Projected (metres) system in the Universal Transverse Mercator (UTM) family, identified worldwide by the code EPSG:20138.
    What datum does it use, and how accurate is it?
    It is based on the a=6378249.145 ellipsoid and it carries Helmert parameters to WGS84. The residual at the test point is about ±2.6 m versus PROJ; for centimetre work use a geodetic adjustment service.
    Where is this system used?
    It is used in Sudan. This page shows its area of use as a coordinate rectangle above.
    How do I convert EPSG:20138 to WGS84?
    Use the free coordinate converter above (preloaded with this system) to convert to WGS84, UTM, or any other system, within a ±2.6 m residual.

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