2006 Annual Report 4d.Progress report. This report serves to document research conducted under a reimbursable agreement between the ARS Hydrology and Remote Sensing Laboratory and the National Aeronautics and Space Administration. Additional details of research can be found in the report for the parent project 1265-13610-026-00D entitled, "INTEGRATING REMOTE SENSING, CLIMATE AND HYDROLOGY FOR EVALUATING WATER, ENERGY AND CARBON CYCLES." ARS led the development of an experimental plan to satisfy a broad range of science objectives in land surface hydrology. Experiments were planned for the acquisition of ground based radar and radiometer measurements over a variety of tree canopy types to determine if soil moisture can be monitored using remote sensing for these conditions. Cooperators include NASA, universities, minority institutions. This project will provide a significant step in guiding the design of near future satellite missions of opportunity.