Wildfires in semi-arid regions can induce vegetation changes that alter fire frequency, increase erosion, and lead to general watershed degradation. This paper describes an International Arid Lands Consortium project in Arizona, Spain, and Israel that is examining the use of MODIS satellite imagery and ground-based verifications to develop a tool to evaluate vegetation changes, erosion, and landscape degradation after wildfires. Site specific GIS data, erosion rates, and vegetation changes are being used to validate MODIS-based models on the Indian and Rodeo-Chediski wildfire sites in Arizona, the Guadalest, Calderona, and Millares wildfire sites in Spain, and several unnamed wildfires on Mt. Carmel, Israel