There is also an error with the ground in sections of Vegas being elevated almost like a step....this has still not been addressed by FSDT or Limesim who claim it's something on the FSDT KLAS side.
There's no "error" anywhere, and it's NOT caused by KLAS airport.
The primary issue is that, real world KLAS IS SLOPED, the altitude it's not the same at all runway ends but, since FSX doesn't really support sloped runways without creating large side-effects with AI, ground textures and vehicles, the airport is flattened at the published official altitude.
Now, if you use the default terrain mesh that comes with FSX, this isn't usually a problem, because the default meshes has been pre-processed by Microsoft in order to fix the "plateau" effect that will result when a sloped airport is flattened along all its extension to the published altitude.
But, if you use a 3rd party (usually more detailed) mesh, it might be more accurate but, if it hasn't been pre-processed to smooth out the altitudes towards the airport perimeter under the assumption the airport is all flattened (which is almost always the case), you will see a step effect.
We include a local mesh to fix this problem with 3rd party meshes but, if you don't use them, you can simply remove the mesh_terrain.bgl file in the fsdreamteam\KLAS folder.
This file is only needed to fix the "plateau" effect when using 3rd parth meshes which hasn't been processed to smooth out elevation differences around airports, to compensate the fact that FSX doesn't really support sloped airports.
If you don't use such meshes, you can safely remove that file, because the MS default mesh doesn't have this issue.
There's a new free product from FS Genesis that is supposed to fix this for several popular airports (including KLAS) so, if you use that one, you can also use a detailed 3rd party mesh, and get rid of the mesh_terrain.bgl as well.
