I recently downloaded gpdem38web (terrain mesh scenery for midwest US) and I noticed that several of the roads are missing. What would it take to put in the missing roads? Is there a tool that you can overlay an image like a map to draw the roads?

You can use AutoASM to lay roads, rivers, lakes, streams, and coastlines on top of any meshed area. I use FSgenesis mesh myself. The URL will show an example used to "fix" Maui. The program has a learning curve!http://users.adelphia.net/~dboley/Dick Boley @KLBE