He is a geographer and hydrologist with a Ph.D. in remote sensing and GIS based estimation of evapotranspiration (ET) and energy fluxes in Catalonia. At UAF, Dr. Cristobal maintains two field sites for flux measurements in boreal forests, leads research on atmospheric correction of remotely sensed data and ET mapping, and provides support for airborne data acquisition, processing and higher-order product generation for habitat mapping. He can be reached at j.cristobal@alaska.edu