A Comparative Study of the SMAP Passive Soil Moisture Product With Existing Satellite-Based Soil Moisture Products. - Burgin, Mariko S.; Colliander, Andreas; Njoku, Eni G.; Chan, Steven Tsz K.; Cabot, François; Kerr, Yann H.; Bindlish, Rajat; Jackson, Thomas J.; Entekhabi, Dara; Yueh, Simon H. (IEEE Trans. Geosci. Remote. Sens., 2017)