I downloaded an autogen program to add realistic trees. now some of the lesser traveled airports such as Henderson, Nevada have trees in the middle of certain runways. obviously the program does not always properly place the trees. Does anyone know of a fix or an idea of how to solve this?

Hi Bill,Usually when I have seen this problem, the default grass polygon had been excluded. This VTP polygon also makes sure that no autogen is placed on the airport itself. Can you also see that these polygons are missing?

I'll check. Thanks!