[OSRS-PROJ] Schreiber Transverse Mercator

Gerald Evenden gerald.evenden at verizon.net
Fri Mar 26 10:39:35 EST 2004

After shelving the Roussilhe for the moment I shifted back to trying to 
find more
information on the even more elusive Schreiber Transverse Mercator 
While googling thought a desperate selection choice and 8,000 results I 
upon  GPSmanhttp://www.ncc.up.pt/~mig/gpsman.html wherein lay a tcl
procedure to "Schreiber Stereographic."

This turned out to be the same as libproj4's +sterea (Alternate 
projection which is a double conversion through the Gauss sphere.  I 
not pin down the creators source for the name but it seems to indicate 
Schreiber had a thing for the double conversion and may have applied it 
the Transverse Mercator problem as well.  Snyder in "Flattening the 
describes the Schreiber as a double conversion.

The next release of libproj4 will contain the "stmerc" projection 
called the Schreiber Transverse Mercator.  As Snyder indicated, the 
error is not zero along the central meridian but from what I find, 
follows a
rather bizarre path.

Jerry and the low riders: Daisy Mae and Joshua

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