Horizon 1 1 17 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES Advances in Space Research 1497-1507 Lake Database Radar altimetry Satellite imagery Essential climate variable 2011 fdi:010053534 ENG Advances in Space Research 0273-1177 ISI:000290136800006 9 10.1016/j.asr.2011.01.004 https://www.documentation.ird.fr/hor/fdi:010053534 https://www.documentation.ird.fr/intranet/publi/2011/05/010053534.pdf 47 Horizon (IRD) An accurate and continuous monitoring of lakes and inland seas is available since 1993 thanks to the satellite altimetry missions (Topex-Poseidon, GFO, ERS-2, Jason-1, Jason-2 and Envisat). Global data processing of these satellites provides temporal and spatial time series of lakes surface height with a decimetre precision on the whole Earth. The response of water level to regional hydrology is particularly marked for lakes and inland seas in semi-arid regions. A lake data centre is under development at by LEGOS (Laboratoire d'Etude en Geophysique et Oceanographie Spatiale) in Toulouse, in coordination with the HYDROLARE project (Headed by SHI: State Hydrological Institute of the Russian Academy of Science). It already provides level variations for about 150 lakes and reservoirs, freely available on the web site (HYDROWEB: http://www.LEGOS.obs-mip.fr/soa/hydrologie/HYDROWEB), and surface-volume variations of about 50 big lakes arc also calculated through a combination of various satellite images (Modis, Asar, Landsat, Cbers) and radar altimetry. The final objective is to achieve in 2011 a fully operating data centre based on remote sensing technique and controlled by the in situ infrastructure for the Global Terrestrial Network for Lakes (GTN-L) under the supervision of WMO (World Meteorological Organization) and GCOS (Global Climate Observing System). 126 ; 032 ; 021 UR065 Chili