Establishment of monitoring and hazard level assessment system for landslide disasters by ALOS, and its application
Ryoichi Furuta(1), Atsushi Yashima(2), Kazuhide Sawada(2) and Hiroshi Fukuoka(3)
(1) Remote Sensing Technology Center of Japan, 1-9-9 Roppongi, Minatoku, 106-0032 Tokyo, Japan
(2) Gifu University, 1-1 Yanagido, 501-1193 Gifu, Japan
(3) Kyoto University, Gokasho, Uji, 611-0011 Kyoto, Japan
Japan has huge numbers of landslide area. Therefore, it is difficult to monitor landslide area one by one. Satellite remote sensing technique has possibility to expedite monitoring of landslide area and its hazard level. In this research, both of ALOS PALSAR DInSAR and ALOS PRISM DSM is applied to monitor landslide.
To monitor landslide movement, ALOS PALSAR DInSAR is used. The authors confirmed the capacity of the L-band SAR, JERS-1 SAR, to monitor landslide movement in the past research already. By applying PALSAR DInSAR for same area of study, capacity of PALSAR to monitor landslide movement was confirmed in this research. And to evaluate landslide hazard level of the area of study, DInSAR result compared with several observation data of ground instruments.
Another way of evaluation of landslide hazard level, numerical model is used. To simulate landslide hazard level by numerical analysis, we used ALOS PRISM DSM for modeling the ground. To generate DSM from PRISM data, we developed the tool of DSM generation. We confirmed the accuracy of generated DSM is similar to the accuracy which reported from JAXA.
Moreover, landslide information system based on kinematic GIS was established using DSM and AVNIR-2 image. In the future, we will propose this system to decision-maker of local.