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    EPSG reference

    EPSG:32631 — WGS 84 / UTM zone 31N

    WGS 84 / UTM zone 31N (EPSG:32631) — a Projected (metres) system on the WGS84 datum, used in Algeria. Parameters, proj4, WKT, accuracy ±0.1 m, plus a free converter to W…

    At a glance

    EPSG
    32631
    Name
    WGS 84 / UTM zone 31N
    Kind
    Projected (metres)
    Family
    Universal Transverse Mercator (UTM)
    Ellipsoid
    WGS84
    Accuracy
    ±0.1 m (vs PROJ)
    Countries
    Algeria
    Convert from this system now

    Area of use

    West0.00°
    South0.00°
    East6.00°
    North84.00°

    Projection parameters

    Projectionutm
    UTM zone31
    DatumWGS84
    Unitsm
    proj4
    +proj=utm +zone=31 +datum=WGS84 +units=m +no_defs
    WKT (ESRI)
    PROJCS["WGS 84 / UTM zone 31N",GEOGCS["GCS_WGS 84 / UTM zone 31N",DATUM["D_WGS_1984",SPHEROID["WGS_1984",6378137,298.257223563],TOWGS84[0,0,0,0,0,0,0]],PRIMEM["Greenwich",0],UNIT["Degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER["False_Easting",500000],PARAMETER["False_Northing",0],PARAMETER["Central_Meridian",3],PARAMETER["Scale_Factor",0.9996],PARAMETER["Latitude_Of_Origin",0],UNIT["Meter",1],AUTHORITY["EPSG","32631"]]

    Sample conversion

    Centre of the area of use: WGS84 3.00000, 42.00000 → EPSG:32631 500000.000, 4649776.225

    Values are within ±0.1 m at the test point.

    About the Universal Transverse Mercator (UTM) family

    WGS 84 / UTM zone 31N 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 Algeria.

    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.

    Related systems

    Useful links: Converter · Batch converter · File converter

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    FAQ

    What is EPSG:32631?
    It is the coordinate system “WGS 84 / UTM zone 31N”, a Projected (metres) system in the Universal Transverse Mercator (UTM) family, identified worldwide by the code EPSG:32631.
    What datum does it use, and how accurate is it?
    It is based on the WGS84 ellipsoid with no default transform to WGS84 (ballpark). The residual at the test point is about ±0.1 m versus PROJ; for centimetre work use a geodetic adjustment service.
    Where is this system used?
    It is used in Algeria. This page shows its area of use as a coordinate rectangle above.
    How do I convert EPSG:32631 to WGS84?
    Use the free coordinate converter above (preloaded with this system) to convert to WGS84, UTM, or any other system, within a ±0.1 m residual.

    You may also need: Arab-world coordinate converter · Surveying file format converter · Batch coordinate file converter