River Water Level and Water Surface Slope Measurement From Spaceborne Radar and LiDAR Altimetry: Evaluation and Implications for Hydrological Studies in the Ganga River oleh Pankaj R. Dhote, Ankit Agarwal, Gaurish Singhal, Stephane Calmant, Praveen K. Thakur, Hind Oubanas, Adrien Paris, Raghavendra P. Singh