All disasters have shared the characteristic of being monumentally costly. The growing prevalence of natural disasters is driving people to pay more and more attention to emergency management. Progress in catastrophe analysis capabilities based on Geographic Information Systems (GIS) may allow the needs of public participation to be considered. Synchronous data sharing between citizens and emergency workers could effectively promote the process of decision-making. With the development of the Internet and technology, Internet-based PPGIS becomes an affordable and accessible GIS tool for public engagement.