How to build this scene:

1. Download the following USGS 1:100000 Digital Line Graphs
   from the USGS ftp site

   CG1.RDS03.opt
   CG1.RDS04.opt
   CG1.RDS11.opt
   CG1.RDS12.opt

   and run them through the "road2pov.perl" script to generate
   "road01.pov" .. "road12.pov".

2. Trace "gclutter.pov" at 1200x1200 no AA, to get the ground
   clutter height field

3. Trace "main.pov" at 590x590 AA 0.1, to get the main panoramic view.

4. Trace files "plaq1txt.pov" through "plaq4txt.pov" at 600x600 no AA,
   to get the plaques. Convert the output images to GIF.

5. Trace "milehigh.pov" at 800x600 AA 0.1
   
