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The Himalayan glaciers are melting under the effect of global warming. However, the extent of this melting remains difficult to assess from ground surveys owing to the great number of glaciers, the difficulty of access and the vastness of the mountain chain. IRD and CNRS scientists from the research units Great Ice and Legos have overcome these difficulties by using satellite imagery. This technique enabled them to compare different glacier topographies established first in February 2000 then in November 2004 on a 915 km2 test area in the Himalaya.