Bethesda uses what is called "terrain noise" on terrain LOD to add detail. I, personally, have found that it just looks like a splotchy mess. This is especially apparent when you create a custom worldspace with LOD. This file simply replaces the terrain noise texture to remove LOD noise all together. Other mods try to enhance the texture, but I found it's just more enjoyable to get rid of the noise. If you feel the same, then this mod if for you!
To install:
Simply extract the file into your 'Fallout/Data' folder.