On some people's map threds they have a over head shot that looks like it was taken in game. http://www.snarkpit.net/forums.php?forum=2&topic=7463&5 (second from the bottom)
I have no idea what you call it or how to do it, but i like to know how. Help would be appreciated.

If I understand what you're asking, just enter these two commands in console:

sv_cheats 1
noclip

It allows you to fly around and go through walls.

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o

Cool, that was easy. Thanks a lot.
I probably should have known that already.

Its cl_leveloverview X (you have to start at 1 and raise it until you
reach a good view of the entire map) thats gonna get you a perfect
overview. But you also want to do what Baron said, and fly over the top
of the map so you can see everywhere.

http://developer.valvesoftware.com/wiki/Creating_Level_Overviews

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Posting And You

Thanks. That would work too, but I'm currently making a Death Mach map. Your answer was actually closer to what i asked, but Snickers was what i was looking for.