So we might picture LOD ranges as concentric circles emanating out from the location of your aircraft, with the higher LODs closer in and the lower LODs farther away.
As we can see, the default LOD 5 circle is quite large, so you will see it all the way out to the horizon. This is the default terrain throughout most of the FS2004 world, a very large circle of low-resolution terrain with your aircraft at the center, following your aircraft through the FS world, continually loading and unloading the data within the circle, moving through the FS environment.
If you install a very high resolution 19m add-on BGL, the relatively small circle of visual range (small dot top left) will extend out only so far, leaving an abrupt transition from 19m to 1223m terrain, causing "rips" or "tears" in the terrain display caused by the inability of the low-resolution terrain to connect properly to the edges of the high-resolution terrain.
The solution to this problem is to fill in the missing range circles to make a more gradual transition out to the horizon to eliminate the rips and tears.
FSGenesis FS2004 Global terrain mesh products fill this gap with 612m, 306m, and 153m terrain (bottom left) that will mitigate the rips and tears for those who have installed 76m, 38m, or 19m terrain mesh anywhere world-wide.
The world is not flat…it comprises mountains, valleys, rolling plains, etc. I.E. topographical features. These bumps, dips, and flat areas all need to be translated into a surface understood by your flight simulator. Terrain Mesh is the name given to the Digital Elevation Model, (DEM), that represents these topographical features. This is the surface of the earth over which the user flies in the simulator (or crashes into!) For more than a decade, FSGenesis has been the leader in highly realistic, high resolution terrain mesh for flight simulator. So to make your simulator world and scenery as realistic as possible, you need terrain mesh!
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