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I have spent a significant amount of time creating a photorealistic airport (LIMN).
I premise that the terrain around the airport is not flat (same altitude).
At south end of the airport I have an altitude of 541.5 feet at north end an altitude of 589.5 feet.
Either altitudes have been measured landing an the ground an reading P3D values.
Two issues arose.
1) I could use the FLATTEN feature targeting the airport nominal altitude, however if do that, a cliff in the terrain is generated at the flatten boundaries, because for definition FLATTEN generates a flat surface all at the same altitude, when my terrain is slightly steeped.
2) I could re-assign a different altitude to the airport to trade-off and reduce the amount of the cliff in the terrain, but doing so I'll generate a huge amount of rework to re-adapt all the objects of the scenery to the new altitude. In fact it's easy to change the airport nominal altitude, while, doing so, ADE doesn't automatically shift all the scenery objects laying on its ground to the new altitude.
Could you let me know your observations or hints?
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Reading better the manual, there is a promising option for issue 1) with "sloping polygons"

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