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A technology for burnt area mapping using Landsat data is developed by the Space Reaearch Institute of Russian Academy of Sciences. The technology began to be used for mass mapping of burnt areas since 2011. It based on iinteractive mapping using GIS instruments in web-interface. During fire season of 2013 this technology was applied to perform mass satellite data processing and to produce the burnt area map for entire Russian Federation territory. As a result, about 5000 fires detected by MODIS were mapped using Landsat images, which accounted for about 80% of total forest burnt area. Total 8,7 Mha, of fires was mapped including 4,9 Mha of forest area. This map allowed to refine the burnt area assessment obtained in near-real-time mode using MODIS hot-spots detection based algorithm and to estimate its accuracy depending on fire size and season. The results led to suggestions for the improvement of rapid MODIS-based burnt area estimations.