
The contents of this directory are a copy of the distribution diskette
supplied with NOAA Technical Report NOS 124 CGS 9: General Cartographic
Transformation Package (GCTP), Version II, by Atef A. Elassal, 1987.
The original diskette contained three files:

	ORIG.FILE1 GCTP FORTRAN source code
	ORIG.FILE2 GCTP NAD27 US SPCS control data
	ORIG.FILE3 GCTP NAD83 US SPCS control data

For Unix types, the source code was split into component FORTRAN
modules and placed in the *.f files.  A "main" PROGRAM module was not
distributed with with the source code so it was left up to the recipient
site to supply a driver program.

Twenty projections are supplied with the package in file pj??z0.f.
Each file has three entry points: ISnnZ0 for intialization, PFnnZ0
for forward projection and PInnZ0 for inverse projection where nn and
?? are the projection number (1-20).

At the moment, the only documentation is the above technical report
and comments in the individual projection funtions as well as the main
entry routine in gtrnz0.f.

At the date of this writing the material referenced can also be
obtained at:

	National Geodetic Information Branch
	N/CGG174, Rockwall Building, Rm 24
	National Geodetic Survey, NOAA
	Rockville, MD 20852
	1-301-443-8631

They accept plastic (credit cards) and I believe the cost is about $30 US.

The only purpose of this distribution is referential and for those only
interested in FORTRAN source code for cartographic projection applications.
No reponsibility is taken for currentness nor accuracy of copy.  The
writer's interest in these procedures was for verification and testing
of program 'proj.'

Gerald I. Evenden  gie@charon.er.usgs.gov

