Measuring Surface Roughness Height to Parameterize Radar Backscatter Models for Retrieval of Surface Soil Moisture. - Ross Bryant; Mary Susan Moran; David Thoma; Chandra D. Holifield Collins; Susan Skirvin; Mohammed Magfurar Rahman; K. Slocum; Patrick J. Starks; David D. Bosch; Maria P. González-Dugo (IEEE Geosci. Remote. Sens. Lett., 2007)