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