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    Re: UTM to lat/lon formulas
    From: George Huxtable
    Date: 2003 Dec 14, 21:56 +0000

    I've got a pocket-calculator conversion working between lat/long and UTM,
    assuming the Clarke 1866 ellipsoid for North America.
    What's more, when I convert to UTM and back again it arrives at the
    original lat/long, within a skin-off-a-midge.
    That's a necessary test, but is not sufficient to show that the UTM values
    are in fact correct.
    In zone 15 (long 96 to 90 deg), if I take a position on the edge of the zone at-
    North 40.0 deg, West 90.0 deg, this gives me for UTM-
    x= 756155; y= 4431860
    This is based on the assumption that 500000 has been added to all x values,
    so that on the centre-line of the zone (93 degrees) the x coordinate is
    500000, to prevent negative values occurring.
    Is it near?
    contact George Huxtable by email at george---.u-net.com, by phone at
    01865 820222 (from outside UK, +44 1865 820222), or by mail at 1 Sandy
    Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.

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