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Within the framework of project of Russia's Ministry of Science and Technologies and grants of Russian Foundation of Basic Research, at the Space Research Instirtute RAS, the Institute of Solar-Terrestrial Physics SB RAS and the Limnological Institute SB RAS a start has been made on the creation of a system of satellite data banks on the state of major lakes of North Europe and Asia. The prime objective of the projected information system is to study variations in the hydrophysical and hydrobiological regime of the lakes in connection with global climate change and anthropogenic influences. The base study objects are: Lake Baikal, The Caspian Sea, Ladoga Lake and The Aral Sea. Satellite images from AVHRR of NOAA satellites provide the basis for the development of the information system. High resolution satellite data of Russian "Resurs" satellite is used for calibration and validation. Baikal ERS SAR images given in our disposition in the framework of European Space Agency Announcement of Opportunity serve for detailed studies of physical and biological processes on the lake surface. The following examples of data fusion are presented: studies of coastline position changes, verification of ice and snow classess classification using high-resolution data, studies of physical factors forming green-blue algae bloom using SAR and IR imagery.