Thanks for the answers!
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ok
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clearing the cache didn’t solve the problem but I think I got part of the problem. The orthophoto is very large and the “crack” is in the middle so I tried to do a smaller Ortho photo and the effect did not take place anymore. I will add screenshots.
It is the same project but different ortho projections.
OrthoProj3.png
OrthoProj9.png
Where does this effect some from?
- Yes, I exported as tiff. I don’t have Global Mapper but I got now what was the problem. By importing I pressed yes to build pyramids but in the same step it also decreases the image quality and because of the big numbers and the small extension of the DSM everything was rounded to this two numbers I have shown. So, it was my fault but if the “noValue”-number would be smaller the effect would not take place I think.