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Terrain clipping new runway, texture anomaly with compiled KML

Hi, I've added a new runway to an airport with FSX Planner and the default terrain clips into it, so I found FSX KML so that I could try and flatten the terrain, apply the default airport texture and get rid of autogen. I drew a polygon in GE, imported it and used the Airport_Backgrounds_Flatten_MaskClassMap_ExcludeAutoGen tag on it. The end result was far from satisfactory and I've included a screenshot to better describe what's going on in hopes someone knows a solution.


If all else fails, all I'm looking for is a way to prevent the terrain from clipping into my new runway, so whatever commands does simply that is what I'd like.
This is usually the case if the altitude (which must be in meters) of the airport and of the flatten are not the same.