Surface Blowout

[AllenJessup]

This is more of a report than a request for help. I've already reverted to a backup drawing. I was starting to work on a grading plan when I noticed something wrong with the existing surface. At first it just looked like some wild contours. But after some investigation I found that some of the Surface was missing. This occurred along part of a boundary where I had pasted a Surface developed from a grid of points exported from a scan into a Surface created from a GeoTiff converted from an IMG file developed from a very large Lidar project. These were pasted a couple of years ago and I never had a problem with the Surface until yesterday.

The first image shows how the area should look like. The second shows the damaged Surface and the third shows the damage in 3D

As I mentioned. I was able to use a recent backup that showed no damage. That drawing did fail and had to be recovered. Some of the Surfaces were duplicates after the recover but I could erase duplicate Surfaces and rename the others to recreate the Existing Surface. This seemed very strange. Which is why I'm posting it.

BTW. I've attached an image of the proposed Surface if it interests anyone.

[Anonymous]

Does the pasted surface source drawing still look ok?

[AllenJessup]

Yes. It still looks fine.