The effective response actions can significantly reduce the damage caused by disasters, but the emergency managers require plenty of information before setting up appropriate strategies. The data gathering and analyzing processes are complex and the time is constrained during emergency. A GIS-based decision support system was developed to enhance the emergency operations during typhoon attacks in Taiwan. The system integrates the real time rainfall monitor and forecast information, the hazard potential, and the basic spatial database to help the emergency managers making decisions efficiently.
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