Panciera, Rocco, Walker, Jeffrey P., Kalma, Jetse D., Kim, Edward J., Hacker, Jorg M., Merlin, Olivier, Berger, Michael, Skou, Niels. Institute of Electrical and Electronics Engineers (IEEE); 2008. The NAFE'05/CoSMOS data set: toward SMOS soil moisture retrieval, downscaling, and assimilation.