[Proj] New NGA documents on UTM/UPS/MGRS; time to update proj.4 implementation of UTM?

Charles Karney charles.karney at sri.com
Tue Apr 29 08:14:20 EST 2014

NGA has recently published

   Universal Grids and Grid Reference Systems, Feb 2014,

   The Universal Grids and the Transverse Mercator and Polar
   Stereographic Map Projections, Mar 2014

These are revisions of

   TM8358.1: Datums, Ellipsoids, Grids and Grid Reference Systems,
   Sep 1990

   TM8358.2: The Universal Grids: Universal Transverse Mercator (UTM) and
   Universal Polar Stereographic (UPS), Sep 1989

NGA is now recommending the algorithms implemented in etmerc for the UTM
system.  So it would probably be a good idea if proj.4 had "utm" hooked
up to "etmerc" instead of the older (and less accurate) "tmerc"

See also

Charles Karney <charles.karney at sri.com>
SRI International, Princeton, NJ 08543-5300

Tel: +1 609 734 2312
Fax: +1 609 734 2662

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