Do you have any other information on the map besides that one picture? I know that may seem like a stupid question but, with that one picture and not much of an overview shot it makes finding a map like that 3 times harder. It might also help if you knew the date when it was posted. Sorry, I can't really help you.
Yea pretty much what he said. But you can PROBABLY narrow it down to a mini game map. Sorry, thats all i know.
The photo looks like 4 different jump maps I played on. I have forgotten the names of all of them but you'll be glad to know its jump map. That narrows it down a bit.
No other shots, and very little information. Here is the bungie info: Bungie.net : Halo 3 File Details