Thank you for answering 🙂 But I think I have solve my problem. I have fixed imaginary measuring points on the shore of the lake. The values �??�??of these measurements are all 0. By performing an interpolation with all all measuring points, even with the imaginary points and the actual points, I get a good result. After conversion to a TIN I could reload the file in ArcScene. It looks like a good terrain model 🙂 Please tell If this way of solving the problem is not a good way. [ATTACH=CONFIG]34465[/ATTACH]
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