I can remove the majority of them with softening or erasing. In the picture, I have not softened or deleted any lines.

Alan
How do you deal with it?

Not sure how to show the model. The area was not softened. It was just a relative flat skin to begin with. The edges just showed up. Here's another view.

I have been running into this for a while and it is very time consuming to fix. After I have applied skin to a terrain the skin is fine for a while. After I move to another area of the model and work then come back to that skin it has developed stretch marks. Sometimes they show up after I have closed and then reopen the model. Most of them can be erased but it takes too much time. I can remove most them by softening as well. Why does this happen and how can I prevent it?

I recieved an xml file from a civil and I can not figure out how to get it into SU. Any help?
The first file was a dtm, no clue on that one either.