ESTABLISHING IMAGE DATABASE FOR SLOPE DISASTER INFORMATION SYSTEM WITH GPS DIGITAL CAMERA AND WEB GIS

摘要

GIS (Geographical Information System) is one of useful tools for disaster prevention. Especially Web GIS based on Internet is a reliable system to collect information of many maps and the attribute data. And Web GIS will be very effective to exchange information. Therefore, the disaster prevention system with Web GIS is required. The target of the research is to establish a system for collecting GIS data by using GPS digital camera. The image of GPS digital camera contains the coordinate of latitude and longitude in EXIF data. GIS data can be established by using the coordinate. However, the coordinate is just position of camera. The coordinate should be converted to point of the object in the taken image. In this study, converting method for coordinate of the object in GPS camera image will be developed using DSM (15 meters grid). The sky line image on the camera point can be simulated using DSM. Direction of the camera can be calculated by image matching with the skyline. After that, coordinate of the object will be calculated. Field surveying with GPS digital camera was carried out for verification of this system. The correct ratio of skyline matching showed 40%. A incorrect reason might be come from simple shape of skyline. Correct ratio may be raised by using high resolution DSM.