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It's unlike the terrain Map sample you first posted.  From what I see, it's a whole lot of clone tool,  cut paste, and merging to be done here. 

Without seeing the actual (3D?) model or aerial view/perspective of the actual terrain model, it's hard to determine what needs to be done. 

Unless you intend to use this on a flat plane, artistic license is on the doer. How one wants the final image to look like.......

But it can be done.....