Hi Jon:
IIUC, you may be incurring aliasing of run time terrain grid quad edges in the horizontal plane just as legacy FS version terrain grid quads might do when a RWY is not precisely oriented on the N-S, E-W Cardinal Axes.
https://www.fsdeveloper.com/forum/t...g-a-large-non-flat-airport.450254/post-865482
AFAIK, MSFS SDK has not yet formally documented what the terrain grid quad system infrastructure actually involves, so we can work with a set of known guidelines and stop guessing.
Hmmm... August 18, 2022 will be MSFS' 2nd birthday; do we want to deal with a temperamental sim undergoing a "Terrible Two-Year-Old" phase ?
But I am intrigued by the vertical "undulations", and I wonder if that may be an artifact of terrain 'smoothing' as a result of the terraforming subsystem when a substantial "falloff" is applied.
This would be a good test case for better understanding how the new MSFS terrain engine works.
I would be interested in looking at high resolution elevation source data for this location.
Would you please consider disclosing the ICAO either here- or via PM- so I can see what the SDK is actually doing with our submitted high resolution elevation source data ?
(I suspect MSFS is "dumbing it down" to reduce precision at run time).
GaryGB