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DEM to TIN    and     TIN to 3D     strange results

Question asked by beard on Nov 16, 2012
I made TIN model of terrain using DEM, but result of about 5% area is bad (southern part)
Like there is some line that actually don't exist (or does it?).
DEM model is I think good and when use just problematic part there is no problem, but when use whole DEM problem appears.

Second problem is that when use TIN in ArcScene for 3D, there are many green triangles and that look very bad.
On this screen shot can be seen and line from problem one: