
Public-domain Cartographic Software (24 Oct. 1994).

There are several sources of public domain cartographic software
that perform cartographic projections as well as other geodetic
computations such as compute geodesic distances (Great Circles)
and datum transformations.

A. General Cartographic Transformation Package or GCTP is one of
	the oldest systems.  It is a package of FORTRAN procedures that
	provide forward and inverse projection of about 23 cartrographic
	projections.  It is the "official" system of the National Mapping
	Division (NMD) of the US Geological Survey.  It also provides
	conversion of State Plane Coordinate System.  It is documented
	with *.txt, *.ps and word processor files as well as hard copy
	manuals.

	It is currently available via ftp from:

		nmdpow9.er.usgs.gov (130.11.52.92)

	as file public/amdahl/gctpv2.dat

	It is also available from:

	Phone: 1-800-USA-MAPS Fax:: (703) 648-5548

	At the moment, prices for mail-order material is unknown.

	For software questions and assistance contact:
	Mike Linck
	Phone: (703) 648-4667  Fax: (703) 648-4722
	E-mail: mlinck@usgs.gov
		U.S. Geological Survey
		510 National Center
		Reston, VA  22092
	
	Note: there is a great deal of other information at this ftp
	site described in *readme* files in the various directories.
	Also assorted DOS procedures.

B. A C language (K&R style) version of GCTP developed at the EROS
	Data Center.  It provides the same projection services as GCTP
	as well as about a half dozen additional projections.

	It is available from ftp site:

		edcftp.cr.usgs.gov (152.61.128.6)

	as file pub/software/gctpc/gctpc.tar.Z

	The material is documented with *.txt and PostScript files.
	Indications in readme's indicate that due to funding, maintenance
	and support for gctpc has stopped although a Q&A email address
	is given.

	Note: the above file is *very* long (~11Mb) due to test data and
	would requires about 40Mb to uncompress and 80Mb to run the
	test procedures.  A copy of source code and documentation
	extraction of this distribution is available on:

		kai.er.usgs.gov (128.128.40.24)

	as file pub/S.gctpc.tar.Z .  It takes less than 1Mb for installation.

	IMHO, the test data is poorly constructed, incomplete, does
	not check against alternate sources and not worth distributing.

C. PROJ.4 system written in ANSI-POSIX C provides three application
	programs (proj, nad2nad, and geod) as well as an easy to use
	library for use in user-written application programs.  More
	than 110 forward projections are provided and inverses are
	available for most (all commonly used ones).  NADCON datum
	conversion program is supplied as well as complete support
	for SPCS and several international grid systems.  Illustrated
	documentation is supplied as three PostScript files.

	Available at ftp site:

		kai.er.usgs.gov (128.128.40.24)

	in directory pub/PROJ.4 .  Check README in this directory for
	description of files.

	For comment or help, contact:

	Gerald (Jerry) I. Evenden
	email: gie@kai.er.usgs.gov
	phone: (508)563-6766
	P.O. Box 1027
  	N.Falmouth, MA 02556-1027

	Note: variants of *proj* are used in the GRASS system.

D. The National Geodetic Survey (NOAA/NGS) provides many FORTRAN procedures
	and DOS programs for cartographic projections as well as datum
	conversions and other geodetic information.

	Contact (they take plastic):
		NOAA, National Geodetic Survey, N/CG174
		1315 East-West Highway, Station 9202
		Silver Spring, MD  20910-3282

		Phone: (301)713-3242;  FAX (301)713-4172
		Mon-Fri 7 a.m.-4:30 p.m. Eastern Time.

	For complete list of products, ask for "Catalog of Products
	and Services of the National Geodetic Survey" and "Geodetic and
	Charting Publications".  Prices are nominal for most software
	products (~$30 US) and *certainly* better than the $90+ they
	were charging in 1992.

	From David Conner, conner@ra.cfm.ohio-state.edu,
		Ohio Geodetic Advisor, NGS:

	"... get the newsletter, 'C&GS UpdatE' It is a quarterly publication
	advertising the latest NGS info, such as revised prices, new software,
	Internet access, etc.  If you do not receive it and would like to you
	can get on the mailing list by contacting the NGS Information Center:"

	301-713-3242 (voice)
	301-713-4172 (FAX)

	Also: "NGS now has an Internet Homepage and provides electronic
	access to it's database, offering most NGS software *free of
	charge*.  This is detailed in the latest issue of the Coast and
	Geodetic Survey's C&GS Update, Vol 6, No. 3, Summer 94.  The URL
	address of the home page is:"

                 http://www.ngs.noaa.gov

    Ftp access is also available at:

                 ftp://ftp.ngs.noaa.gov

	There are a lot of DOS *.exe's at this site.  Sources are mostly
	in FORTRAN 77.  Site is well organized.

E. The Defense Mapping Agency (DMA) is also a source of considerable
	cartographic software and information.  Unlike the NMD/USGS
	and NGS, DMA information is international in scope.  Some products
	(mostly maps) are sold through the USGS, but an outlet for software
	and other geodetic information is currently unknown.

F.  From Sol Katz (skatz@dsc.blm.gov), a notice of some sources for
	UTM conversions on ftp.blm.gov (158.68.32.62) in pub/gis/ :

	pub/gis/llutm.zip   quickbasic src/exe for lat/lon to/from utm
				and other stuff
	pub/gis/ll2utm.f77  a f77 subroutine for lat/lon to utm conversion

	There are some other interesting files on this ftp site (GIE).

Gerald (Jerry) I. Evenden   Internet: gie@kai.er.usgs.gov
voice: (508)563-6766          Postal: P.O. Box 1027
  fax: (508)457-2310                  N.Falmouth, MA 02556-1027
