Abstract
To promote rapid and efficient safety management of filldams, this study examined the applicability of interferometry SAR (InSAR), which is used to measure exterior deformation of filldams using ALOS PALSAR data. The result showed the accuracy, Root Mean Square Error, of displacement of filldams monitored by InSAR compared to GPS measurement was about 11～13mm. In addition, the trend of time-series variation was well captured by InSAR. Therefore, this study indicated that it is possible to monitor exterior deformation of filldams by InSAR techniques using ALOS PALSAR data. Moreover, there is a possibility of applying this technique to other large-scale infrastructures.
