A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: C.L. Holm
Date: 2003 Apr 14, 16:52 -0400
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) = ??)
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 firstname.lastname@example.org http://www.cs.hmc.edu/~geoff/
Perl is awk with skin cancer.
-- Henry Spencer
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