CONCURRENT VOLCANO ACTIVITY MAPPING SYSTEM WITH GROUND FIXED SINGLE DIGITAL CAMERA

摘要

Mapping of volcanic activity during eruption is very important to monitor their behavior such as lava flow, pyroclastic flow, mudflow, and so on. Eruption events are usually of short duration. It is very important to obtain information of volcanic phenomena or damaged area on real time basis in order to predict and mitigate calamity that is caused by eruptions. In this research, a ground fixed single digital camera is used, and the automatic mapping system is designed for real time monitoring. Once a digital photo is obtained, a final output is provided concurrently with volcanic activity. Through this system, orthophoto image is created as a final output. A digital photo is rectified onto 3D computer graphics to obtain texture image with fixed location and attitude. This 3D computer graphics is created from DEM. Rectification is done by matching of skyline between two images. Then, the rectified digital photo is converted to orthophoto with DEM. Through this system, volcanic activity is automatically mapped as orthophoto on real time. This system helps chronological change analysis of volcanic activity, especially for short time period time series. Volcanic activities which are mapped by this system would be utilized by volcanologist and other concerned parties to help people evacuate from hazards in case of eruption.