Monitoring Water Levels and Discharges Using Radar Altimetry in an Ungauged River Basin: The Case of the Ogooué. - Sakaros Bogning; Frédéric Frappart; Fabien Blarel; Fernando Niño; Gil Mahé; Jean-Pierre Bricquet; Frédérique Seyler; Raphaël Onguéné; Jacques Etamé; Marie-Claire Paiz; Jean-Jacques Braun (Remote. Sens., 2018)