ptiger is a Tcl/Tk/Tkgeomap script that uses wdgeomap to display U.S. Census Burea populated places on an interactive geographic map. It requires Tcl/Tk 8.3 or later and Tkgeomap 2.1 or later. To download it, go the download page and choose a mirror near you. Extract the archive from the tar ball with a command like:
gunzip -c ptiger.tar.gz | tar xf -To run it, cd into the ptiger directory and type ptiger on the command line. After a few seconds, a map should appear. Adjust the view by Dragging or Double-Clicking. As the cursor moves, a label below the map displays the cursor location and the azimuth and range from the + marker to the cursor. Move the + marker by Right-Double-Clicking. The map has dots at places with population greater than a user selected threshold. Moving the cursor over a dot labels the place with its name and displays the population in another label below the map. In addition to the wdgeomap menus, a Places menu enables adjustment of the population threshold and dot size. There is also a Find menu that does a case insensitive regular expression search for a named place.