We developed an open data visualization system called “VOICE” (Visualization of
Open Data Informationfor a City in Emergency), which is intended to be used by Japanese
residents both duringnormal times (NT) and emergencies and natural disasters. During NT,
VOICE would provide opendata visualization of disaster prevention and risk reduction. In
emergencies, VOICE would providereal-time visual data on emergency or disaster
information issued by the disaster control headquarters.In addition, the system would be
able to visually represent real-time information on reliefsupplies requested by
emergency shelters. To evaluate the effectiveness of the open data visualizationsystem,
we conducted a survey, including 28 municipal employees from the disaster
preventiondivision and 60 residents who were asked to evaluate the system for
operability, effectiveness, functionality,usability, and relevance. The results of the
survey indicate subjects’ overwhelming positiveresponse to the system for all five
measures.