Iceland N64 14.86 W016 10.31
Mt Foraker, Alaska N62 55.27 W151 16.58
There are actually two different artifacts: Lines that run along QMID boundaries in north-south and east-west direction, and undulations between these lines (64 waves between lines). What I've observed so far by testing own scenery:
1) these artifacts do not come from the source data, they are created by resample.exe, or by the rendering engine in the sim
2) the problem is worse at high latitudes and at high deviations from BaseValue - typically in mountainous terrain
3) using lossy compression (CompressionQuality < 100) seems to be responsible for the undulations and for stronger lines
So my first measure was to avoid lossy compression for DEMs, which has a high price, increasing filesize by factor 4 - 10, compared to moderate CompressionQuality settings between 90 and 95. But that still does not eliminate the lines completely:
Default scenery (Iceland N64 04.70 W016 29.97)
Same location, high-res version
Is there anything else that I can do as developper to avoid these artifacts?
