This screeny shows an important feature of the area where I live. Without 150 metre mesh terrain the small mountain area is totally flat but fortunately it is now a reasonable copy of the real thing.
All the area outside the line I have drawn does not exist, nor do the buildings on it. Basically a walking track around the Mountain's base falls into the water.
My query is, can this area be removed. I have seen many add-ons done over existing terrain but wonder whether Microsofts non-existent land can be removed as well ?