I have a particular problem with the mesh in FS2004 where it breaks through the Lago Terramesh which I have installed. I am using the Visual Flight Photographic Scenery.I have used the Scenery Reference from the FS SDK and have written a C++ program to investigate all BGL's in the default EURW directory which overlap the limits of the VFR scenery meshes.I have identified files in the default scenery which overlap with the VFR scenery and which do not have VOR, Object, Library, Facilities, ADF or Dynamic data. You can see the results at:http://www.visualflight.co.uk/forums/topic...946&whichpage=2However, these include coastlines as well as meshes so that outside of the VFR scenery area, eg Scotland, the coastline tiles are missing.Could anyone tell me how I can identify which files contain only terrain mesh?George

Hi George.I'm not sure exactly what you are looking for. The 'FL*.bgl' files are airport flattens, and the 'HP*.bgl' files are hydropolys. These are LWM masks which alter the height of the mesh.Generally, these BGLs cover quite a large area and contain many elevation areas. You can view these in TMFViewer. There is no exclude, but the heights can be overwritten with new LWM flattens, or Area16n SCASM polys.As far as mesh, I believe they are prefaced as 'de*.bgl'Dick

Thanks Dick,I think I'm getting somewhere.George