"HYDROWEB" hydrological database
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The LEGOS/GOHS team has recently developed a water level database on major rivers, lakes and wetlands. This database can be accessed through the LEGOS website (Products/Observation and Archives Services/Hydrology): http://www.legos.obs-mip.fr/en/soa/hydrologie/hydroweb/ The water level time series are based on altimetry measurements from Topex/Poseidon, Jason-1, ERS-2, ENVISAT and GFO satellites. The database includes water levels for over 130 lakes and man-made reservoirs, 250 virtual stations on rivers and about 100 sites on flooded areas. Most river water level time series are based on Topex/Poseidon observations and start in January 1993. The lake water level time series are multi-satellite data combinations. They also start in January 1993. The time series are regularly updated and the number of sites increases regularly. Users have access to associated errors. The temporal resolution is 10 days for the Topex/Poseidon time series. |
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| Figure 1: Geographical distribution of lake, river and flooded plain sites of the HYDROWEB database |
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 Rivers and flooded areas; 220 stations on the rivers; 130 stations on wetlands |
 Lakes and reservoirs |
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Figure 2 : Examples of water level time series from the HYDROWEB database, on the Niger, Yangze, Indus and Danube rivers. |
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