[HFP]

... because HeightMapVisual3D already uses Y axis as up axis. But this should not be a problem because HeightMapVisual3D already have the planar X and Y coordinates in the HeightData array and Height value that is pointing up.

Dear Andrej,

Thanks a lot for your help!

At the end of the day, it seems to be only a small problem now ... :-)

Because it's already easy to change the position and direction of my TargetPositionCamera, I can simply start the Viewport3D in the right way (related to geodetic or geographic orientation):

https://www.optimalsystem.de/os/pics/Opt...3D-Log.png

And due to its definition, HeightMapVisual3D is just adequate to this real-world XYZ orientation ... :-)

And of course I'll also try to realize your new recommendations!

Best wishes,
Hagen