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From: colonel@ellie.UUCP (Col. G. L. Sicherman)
Newsgroups: net.math,net.wanted.sources
Subject: Re: Map Projection Software
Message-ID: <877@ellie.UUCP>
Date: Tue, 11-Mar-86 12:15:05 EST
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Posted: Tue Mar 11 12:15:05 1986
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Summary: definition of mercator

My copy of Granville's calculus gives the inverse Gudermannian as
v = ln(sec q + tan q) = integral sec q dq.  The corresponding
Mercator projection is (lat,long) -> (ln(sec lat + tan lat), long).
Of course, the angles are in radians.

	"What's that barking noise?"
	"Those are seals, Captain."
	"Seals?  Then we must be near Easter Island."
				--American Pie
-- 
Col. G. L. Sicherman
UU: ...{rocksvax|decvax}!sunybcs!colonel
CS: colonel@buffalo-cs
BI: csdsicher@sunyabva