Disaster prevention information systems should maintain high levels of reliability for information. Internet Bulletin Board Systems (BBS) occasionally include inaccurate, malicious or incorrect information. Anonymous posts to bulletin boards are particularly unreliable. BBS should not serve as primary means for official communication. Moreover, most local governments are hesitant to issue evacuation orders despite the urgency of timely announcements because of the suddenness of debris flows. In the current study, we developed a disaster prevention information system using a combined Geographic Information System (GIS) and Social Network Service (SNS) called giSight. The function of SNS is to keep the reliability of information at a high level by registering users. A hazard map of landslide and debris flow is indicated on the GIS with high-resolution aerial photograph tile maps. This hazard map identifies the mesh polygon with dangerous conditions in real-time, i.e. dynamically. This system is not only useful for disaster prevention, but is also expected to facilitate the exchange of information by residents in normal circumstances.

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