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    EPSG reference

    EPSG:30494 — Voirol 1879 / Sud Algerie (ancienne)

    Voirol 1879 / Sud Algerie (ancienne) (EPSG:30494) — a Projected (metres) system on the clrk80ign datum, used in Algeria. Parameters, proj4, WKT, accuracy ±0.1 m, plus a…

    At a glance

    EPSG
    30494
    Name
    Voirol 1879 / Sud Algerie (ancienne)
    Kind
    Projected (metres)
    Family
    Lambert Conformal Conic
    Ellipsoid
    clrk80ign
    Accuracy
    ±0.1 m (vs PROJ)
    Countries
    Algeria
    Convert from this system now

    Area of use

    West-2.95°
    South31.99°
    East9.09°
    North34.66°

    Projection parameters

    Projectionlcc
    Standard parallel 133.3
    Latitude of origin33.3
    Central meridian2.7
    Scale factor0.999625769
    False easting500000
    False northing300000
    Ellipsoidclrk80ign
    Unitsm
    proj4
    +proj=lcc +lat_1=33.3 +lat_0=33.3 +lon_0=2.7 +k_0=0.999625769 +x_0=500000 +y_0=300000 +ellps=clrk80ign +units=m +no_defs
    WKT (ESRI)
    PROJCS["Voirol 1879 / Sud Algerie (ancienne)",GEOGCS["GCS_Voirol 1879 / Sud Algerie (ancienne)",DATUM["D_Clarke_1880_IGN",SPHEROID["Clarke_1880_IGN",6378249.2,293.4660212936269]],PRIMEM["Greenwich",0],UNIT["Degree",0.0174532925199433]],PROJECTION["Lambert_Conformal_Conic"],PARAMETER["False_Easting",500000],PARAMETER["False_Northing",300000],PARAMETER["Central_Meridian",2.7],PARAMETER["Standard_Parallel_1",33.3],PARAMETER["Scale_Factor",0.999625769],PARAMETER["Latitude_Of_Origin",33.3],UNIT["Meter",1],AUTHORITY["EPSG","30494"]]

    Sample conversion

    Centre of the area of use: WGS84 3.07000, 33.32500 → EPSG:30494 534438.575, 302832.645

    Values are within ±0.1 m at the test point.

    About the Lambert Conformal Conic family

    Voirol 1879 / Sud Algerie (ancienne) uses the Lambert Conformal Conic projection — a cone-based, angle-preserving grid well suited to territories that stretch east–west, defined by one or two standard parallels. It is common for national mapping and for oil-and-gas grids across North Africa and Arabia.

    Scale is true along the standard parallel(s) and grows away from them; for precise distance work reduce ground distances to grid using the point scale factor. Confirm both standard parallels and the datum before trusting imported coordinates.

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    FAQ

    What is EPSG:30494?
    It is the coordinate system “Voirol 1879 / Sud Algerie (ancienne)”, a Projected (metres) system in the Lambert Conformal Conic family, identified worldwide by the code EPSG:30494.
    What datum does it use, and how accurate is it?
    It is based on the clrk80ign 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:30494 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.

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