Hajime NISHIMURA¹, *Shinya KAKUTA¹, Toshio KOIKE², Toru FUKUDA³, Yukihiro NOJIRI⁴ (1.Japan Agency for Marine-Earth Science and Technology, 2.Department of Civil Engineering, School of Engineering, The University of Tokyo, 3.Earth Observation Research Center, Japan Aerospace Exploration Agency, 4.National Institute for Environmental Studies)