An Detectability of Debris Flow by Using PALSAR and PiSAR (L-band) Data

RSSJ Journal of The Remote Sensing Society of Japan Vol. No. ( ) pp. ATANABE HIMADA ORIYAMA ADONO Center for Northeast Asian Studies, Tohoku University, KawaEngineering, Faculty of Engineering, Nagasaki University, Bunkyo-machi, Nagasaki. . . . * * uchi, Aoba-ku, Sendai, Miyagi, Japan * Earth Observation Research Center (EORC), Japan Aerospace * Exploration Agency, Sengen, Tsukuba, Ibaraki, Japan * Department of Electric and Electronic * shi, Nagasaki, Japan Debris flow sites at Kumamoto and Nagano, where the flows were induced by heavy rain, have been examined by using L-band SAR data. Several L-band SAR data taken with air-borne PiSAR (polarimetry mode) and PALSAR (HH polarization) are used and examined the detectability of the debris flow. The disaster sites are well detected by a three components scattering model and volume , double bounce, and surface scattering account for , , and , respectively. But a wasteland shows resemble scattering rates and a land utilization map is needed to distinguish these two sites. We also analyzed two PALSAR data taken at Nagano before and after the debris flow with an o -nadir angle of . degree and with a polarization of HH. The value over debris flow site become larger after the disaster for both debris flow sites. But the absolute value of the in Nagano is to dB lower than that in Leyte. We use small perturbation model and conclude that the possible causes of this di erence is due to the di erence of incident angle. jaxa.jp/press/ / / _daichi_j.html PALSAR HH ALOS H-IIA SAR PiSAR