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Re: Equations for Mercator projections?

Subject: Re: Equations for Mercator projections?
From: C.L. Holm (CHolm@XXX.XXX)
Date: Mon Apr 14 2003 - 16:52:35 EDT

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@XXX.XXX]
Sent: Monday, April 14, 2003 4:40 PM
To: NAVIGATION-L@XXX.XXX
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@XXX.XXX/~geoff/

Perl is awk with skin cancer.
                -- Henry Spencer

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