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    Re: Equations for Mercator projections?
    From: Herbert Prinz
    Date: 2003 Apr 15, 00:10 +0000

    Dear Prof. Kuenning,
    
    The formula can be found in any standard textbook on geodesy, map
    projections or the like, in any school library. If these "students"
    (doesn't this word come from 'studeo' = to devote oneself ?) have not had
    any success in finding the equations on the Web on any of the dozens of
    sites that have them, it's probably because they don't know what to look
    for. In this case, they should not even try to program the formula. There
    are already enough people out there who know all about the difference
    between Perl and awk, or what have you, and nothing about the problems
    that they are supposed to solve with these tools. I trust that as a
    responsible teacher you will steer your students into the right direction.
    
    For your orientation, a google search for 'mercator projection'  brings up
    
    http://www.posc.org/Epicentre.2_2/DataModel/ExamplesofUsage/eu_cs34f.html
    http://www.beanpaste.com/BSG/mercator.html
    etc., etc.
    
    I hope this helps.
    
    Best regards
    
    Herbert Prinz
    
    P.S.
    
    You should also be aware that the problem, as you state it, is
    underdetermined. There is no such thing as "the scale of a Mercator map".
    
    P.P.S.
    
    So, who is Henry Spencer, and what's his relevance to navigation?
    
    
    geoff{at}CS.HMC.EDU wrote:
    
    > I have some students who need to be able to convert lat/long into x/y
    > coordinates on a Mercator projection.  They know the lat/long of the
    > upper-left corner and the scale of the map.  They haven't had any
    > success finding equations on the Web.  Does anybody have any pointers?
    > --
    >     Geoff Kuenning   geoff{at}cs.hmc.edu   http://www.cs.hmc.edu/~geoff/
    >
    > Perl is awk with skin cancer.
    >                 -- Henry Spencer
    
    
    

       
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