I have a contour map from an aerial photography company that is 5 miles long, 1/2 mile wide. No surface is attached but they gave me the TIN file. I saved the original so I can play with it. I tried creating a Surface from the tin file but I keep crashing. I am going to be putting an ORTHO photo behind it also and I am going to be creating profiles from it for a power line project. Is it too much-should we break it in half or quarters?