Usa Autumn mask is a non invasive masks system. There are enough brown fields in Msfs at low elevation; where the terrain do not even become really brown in Autumn; however; as elevation goes up terrains do become more brown in Autumn; and magically the brown areas in Msfs diminish with elevation. That is where this
mask come into the game. It blend to default terrain at an elevation of 1300 m pushing its effect up to 2500 m; where rocky formations elevate to higher altitude and no masking is needed. This is what and why this mask is non invasive; will not paint brown most of roads; will not paint brown airports or anything else at low elevation where
most of human structures are built; and sure your mountains rocks formation will not turn red either as they are excluded. It is a straight forward manual installation; will not tamper with Msfs default settings or any file whatsoever; add to community folder; when you had enough of it delete and is gone; want it back again ? Dump it in community folder. It cover the whole of United States including Alaska and Hawaii.