ENVISAT ASAR MEDIUM AND HIGH RESOLUTION IMAGES FOR NEAR REAL TIME FLOOD MONITORING IN CHINA DURING THE 2005 FLOOD SEASON

摘要

The Flood Dragon project will enhance the ENVISAT objective to monitor natural disaster such as flooding. The project's first objective was to explore ENVISAT ASAR and MERIS spatial and temporal resolution potential for rapid flood mapping and monitoring. One of the major final goals is to provide data exploitation guidelines and system improvement's recommendations for a Real Near Time exploitation of ASAR data for flood monitoring. China flood prones more precisely the proposed test sites, Songhua watershed, Poyang and Dongting lakes, appear as a very adequate case of study in term of extent of the flooded area, and long period of flood in regard of High, Medium and low resolution ASAR products. During the 2005 flood period, fifteen NRT exploitations of ENVISAT ASAR have been tented. Ten were successful exploiting both Emergency programming procedure and Rolling archive ones based on Ordinary acquisition scheduling. The results obtained in four NRT cases carried over Chinese major flood prone, Dongting and Poyang lakes, Pearl, Nen and Songhua rivers are illustrated and lessons discussed in terms of programming, downloading and processing.