Help Making Campaign Map

Well, actually it's a mod for MTW but I'm using the same tools as RTW. Obviously just not making it 3d. Anyway, when using 3DEM, and taking the pictures of the landscape, I discovered a little problem. After taking all the pictures I began tiling them. But as I do, the tiles don't quite fit together.

Here's a screenshot:
https://img138.imageshack.us/img138/...lemizb3.th.png



Any help or solutions? Thanks for any advice as well. Also, I'm posting it in this part of the forum since I would've thought that RTW modders would be using this tool more often. Probably..... with the exception of me. <_<