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    EPSG reference

    EPSG:20137 — Adindan / UTM zone 37N

    Adindan / UTM zone 37N (EPSG:20137) — a Projected (metres) system on the a=6378249.145 datum, used in Sudan. Parameters, proj4, WKT, accuracy ±2.8 m, plus a free convert…

    At a glance

    EPSG
    20137
    Name
    Adindan / UTM zone 37N
    Kind
    Projected (metres)
    Family
    Universal Transverse Mercator (UTM)
    Ellipsoid
    a=6378249.145
    Accuracy
    ±2.8 m (vs PROJ)
    Countries
    Sudan
    Convert from this system now

    Area of use

    West36.00°
    South3.40°
    East42.00°
    North22.01°

    Projection parameters

    Projectionutm
    UTM zone37
    Semi-major axis6378249.145
    Inverse flattening293.465
    Unitsm
    Helmert shift to WGS84-166,-15,204,0,0,0,0
    proj4
    +proj=utm +zone=37 +a=6378249.145 +rf=293.465 +units=m +no_defs +towgs84=-166,-15,204,0,0,0,0
    WKT (ESRI)
    PROJCS["Adindan / UTM zone 37N",GEOGCS["GCS_Adindan / UTM zone 37N",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",39],PARAMETER["Scale_Factor",0.9996],PARAMETER["Latitude_Of_Origin",0],UNIT["Meter",1],AUTHORITY["EPSG","20137"]]

    Sample conversion

    Centre of the area of use: WGS84 39.00000, 12.70500 → EPSG:20137 499907.227, 1404307.392

    Values are within ±2.8 m at the test point.

    About the Universal Transverse Mercator (UTM) family

    Adindan / UTM zone 37N 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

    It is the coordinate system “Adindan / UTM zone 37N”, a Projected (metres) system in the Universal Transverse Mercator (UTM) family, identified worldwide by the code EPSG:20137.

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