Vegetation effects on sub-pixel roughness measurements from NASA's Terra/ASTER stereo images A. Mushkin1, A. Gillespie2, E. Abbot3, M.R. Smith2, J. Avila4, E.E. Brodsky4 1Geological Survey of Israel 2University of Washington, Seattle, WA 3Jet Propulsion Lab, Pasadena, CA 4UC Santa Cruz, Santa Cruz, CA