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    Re: Equations for Mercator projections?
    From: C.L. Holm
    Date: 2003 Apr 14, 16:52 -0400
    RE: Equations for Mercator projections?

    Are you trying to find a mathematic equation to describe the relationship between latitude and longitude as it varies by latitude?  (e.g. 1 degree of latitude = 60 nm, 1 degree of longitude at 0 degrees (equator) = 60 nm, and 1 degree of longitude at 45 degrees (north or south) = ??)

    -----Original Message-----
    From: geoff@CS.HMC.EDU [mailto:geoff@CS.HMC.EDU]
    Sent: Monday, April 14, 2003 4:40 PM
    Subject: Equations for Mercator projections?

    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@cs.hmc.edu   http://www.cs.hmc.edu/~geoff/

    Perl is awk with skin cancer.
                    -- Henry Spencer

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