To understand the impact of the 2011 Tohoku earthquake tsunami and to observe the recovery efforts in the tsunami-affected areas, the authors conducted an integrated analysis identifying the spatial distribution and amount of tsunami debris, with aerial photos, satellite images, and LiDAR data. The analysis was conducted in Onagawa Town, Miyagi Prefecture including the ground truth data acquisition. The horizontal mapping of tsunami debris in Onagawa town was performed through object-based image analysis of aerial and satellite images. Integration of horizontal mapping of tsunami debris and the analysis of digital surface model (DSM) of LiDAR data yields an estimate of the volume of the debris to be used as the observation of debris removal efforts.
