REALISTICALLY, chams are never really near the ground. Their ecosystem is high up in the canopy.
Check out youtube has some pretty neat videos. Even a chameleon crossing streets and floating across a river/pond. A member here recently found a veiled on the ground which was from a WC population in CA supposedly. So a lot of chameleons encounter the ground all depending on circumstance and species I guess.
I know first thing I think though. Is up in the trees.