[Proj] Complex Transverse Mercator

[Clifford J Mugnier]

"Secondly, UTM is bound by "law" to the limits of +-3.5 degrees so these
extensions are immaterial."

Actually, that's not exactly true.  Army TM-5-241-41 is a copious tome of
"Zone to Zone Extention Tables" that also document the Gauss-Krueger
Transverse Mercator to the (if I recall correctly), Fourteenth Derivative.
That extension of the series allows "round-trip" transformations to be made
to ±24° of the Central Meridian with an accuracy of 0.1mm.  That document
is the true "legal" extension, as far as the U.S. Army is concerned.

A long time ago, when I was a Topographic Engineer in the U.S. Army, I was
issued a COMPLETE set of the "TM" books of tables (all ellipsoids, etc.).
That was standard issue, and the stuff was carried around (about 60 lbs.),
from one duty station to another because of the truism, "All major battles
will be fought at UTM Zone Boundaries and/or Datum Boundaries!"  The
Topographic Engineers had to compute the zone extensions so that the
Artillery Corps could effectively supply indirect fire beyond the "normal"
zone limits.

Clifford J. Mugnier C.P.,C.M.S.
National Director (2006-2008)
Photogrammetric Applications Division
AMERICAN SOCIETY FOR PHOTOGRAMMETRY AND REMOTE SENSING
and
Chief of Geodesy
Center for GeoInformatics
LOUISIANA STATE UNIVERSITY
Dept. of Civil Engineering
CEBA 3223A
Baton Rouge, LA  70810
Voice:              (225) 578-8536
Facsimile:          (225) 578-8652
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http://www.cee.lsu.edu/facultyStaff/mugnier/index.html
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