Soil Moisture Active Passive (SMAP) Calibration and Validation Plan and Current Activities T. J. Jackson, M. Cosh, R. Bindlish, W. Crow, USDA ARS HRSL A. Colliander, E. Njoku, K. McDonald; NASA JPL J. S. Kimball; University of Montana S. Belair; Environment Canada J. Walker, R. Panciera; University of Melbourne P. O'Neill; NASA GSFC July 29, 2010