Hi GErd,

if you use DEM with voids, voids are visible as areas with no shading.
When you move mouse cursor over voids, Mapsource doesn't show height.

Now this is unexpected: both areas can be misaligned. It looks like there are different procedures for calculating shading area and DEM heights area.

I have tested maps from your demmove set. For all version areas are misaligned, differences are from 25 to 80m.

On the same maps compiled with bicubic patch, areas are aligned.

--
Best regards,
Andrzej
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