Managing water levels and river flows requires detailed knowledge, in particular in the context of climate change. Yet in situ hydrologic stations are increasingly rare and financing their maintenance can be problematic. Calculations of “water elevation” (the altitude of rivers and lakes) based on data from Earth observation satellites provide a promising new source of information. Combined with other hydrological information from satellites, these altimetry data open up multiple perspectives for both scientific research and the operational management of water resources, in particular for large transboundary rivers.
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