There is a critical need to apply developing technologies to problems of scaling tropical ecosystem and ecophysiological processes, from local levels up to stands, communities, biomes, and beyond. Such scaling is critical if we are to accurately predict changes in the composition, structure, and dynamics and understand how those changes are likely to affect tropical rainforests. Fixed and mobile sensor arrays provide a solution to meet these needs. CENS is collaborating with the Organization for Tropical Studies on planning for a large network of fixed and mobile sensors at the La Selva Biological Station in Costa Rica.