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    UTM to lat/lon formulas
    From: Paul Hirose
    Date: 2003 Dec 10, 19:28 -0800

    U.S. Defense Mapping Agency Technical Manual 8358.2, "The Universal
    Grids," is an authoritative source for the UTM formulas. The
    publication is available as a 2.8 MB PDF and may be downloaded here:
    
    http://earth-info.nima.mil/GandG/pb.html
    
    It is item no. 4 on the list. Some of the other pubs there are pretty
    interesting too.
    
    With the document in hand, be sure to read ahead to determine which
    terms will be needed. For example, the "T17" and higher terms need not
    be computed if you only want to convert UTM to lat/lon and vice versa.
    
    The "Explanatory Supplement to the Astronomical Almanac" also has the
    formulas, in a different format as I recall. Several years ago I tried
    to code up a routine based on that book, but never got it to work.
    Later someone told me the book had a misprint.
    
    The need for the routine evaporated, so I never did try the DMA pub's
    formulas.
    
    
    

       
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