g3DGMV (3D Graphical Map Viewer) The g3DGMV program was design as a free viewer for Digital Elevation Model (DEM ) and Digital Line Graphs (DLG ) maps. Both of these formats are available from various locations on the web. These maps are rendered by g3DGMV as a 3D images that can be manipulated by the user and view from different angles. In addition g3DGMV can read maps that have been saved as bitmap (gif ,png, jpeg ,xpm). Because these formats do not contain elevation information they are viewable only in 2D mode. The program contains many utility's that enable the user to add their own location information to these maps. These tools can be used to mark a favorite camp site or highlight the best route to some location. g3DGMV is a Open Source Free Software program, primarily designed for use with X Window System. It is being developed using the GTK+/Gnome tools. To compiling g3DGMV, extract the files from the distribution. tar -zxvf g3DGMV-.tar.gz Go to the g3DGMV- directory and type configure make The command configure will generate a Makefile for your machine, and make will compile a binary for your machine. For more information read the INSTALL file in the g3DGMV- directory. After the progarm has been complied a binary file called g3DGMV will be created in the src subdirectory. Type "cd src" to change to source director. Type "g3DGMV" to execute the g3DGMV program. Next you'll need to download a DEM map. The following USGS site has a list of DEM and DLG maps for various areas. After you uncompress the map, make sure to rename it with the appropriate extension (dem or dlg). http://edcwww.cr.usgs.gov/doc/edchome/ndcdb/ndcdb.html you can now access the map from the file selector within g3DGMV. A Manual and answers to frequently ask questions can be found at: http://g3dgmv.sourceforge.net/mapview4.html If you would like to contribute to this project drop us a line at: yostn2000@yahoo.com. g3dGMV web site: Users: http://g3dgmv.sourceforge.net/ Project: http://sourceforge.net/projects/g3dgmv/