Indeed. I think someone editted the map and resaved it wrong. Just a guess, because there are SO MANY DAMN MAPS that use that same terrain. Anyways.
On Eden Pop Normal, it took me a LOT of tries to be able to defend myself, especially with what is it, only one ConVec? Or is that only on hard?
Anyways, first focus on morale (agridomes+residence until your people are no longer b****ing about sleeping in a tube), then get a S.Lab up, get a Uni/Nursery, then CyberTele for moar truckz and ConVec(s). Then WEPUNZ LUL.
Also a tip: If you colonize the mineral-rich right side of the map, the AI will roll over your old base and be content with that. They were programmed to go there, not chase you. However, on Hard (unsure about Normal), there are massive waves that periodically (the longer you play the more frequent) come from the southern plateau that WILL target your right-side base. So just make sure you've got an ample supply of 2:1 Thor:EMP Tigers. Toss in a few Acids for good measure if you want.