[Proj] UTM map calibration in several zones?!?

[Clifford J Mugnier]

Multiple zones of a single Grid system are often found in overlap areas.  Such is the rule rather than the exception for the U.S. Geological Survey maps of the United States with respect to the State Plane Coordinate Systems.  With respect to the military services, it is found on ALL 1:50,000 topographic maps intended to be used by NATO forces in areas of potential zone overlap.
 
Some WWII - era maps of North Africa had three, sometimes four different Grids overprinted on the same paper map.  That was the usual case with the old British Grids in which the Grid boundaries were cut along ellipsoidal loxodromes ... for Europe, too!
 
C. Mugnier
LSU

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From: proj-bounces at lists.maptools.org on behalf of support.mn at elisanet.fi
Sent: Fri 06-Feb-09 02:55
To: proj at lists.maptools.org
Subject: [Proj] UTM map calibration in several zones?!?



I just wonder, that if a system gives UTM map calibration points in several zones so how they are going to draw that map?

I have always been assuming that a single map can only have one zone (one projection) and all reference points have to be in that zone (projection)? (Except maybe some special cases)

Regards Janne.

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