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[5] MILILLO P., BÜRGMANN R., LUNDGREN P., SALZER J., PERISSIN D., FIELDING E., BIONDI F., MILILLO G. Space geodetic monitoring of engineered structures: The ongoing destabilization of the Mosul dam, Iraq. Scientific Reports, 6, 37408, 2016. [6] SATO H., SASAKI T., KOBORI T., ENOMURA Y., YAMAGUCHI Y., SATO W., MUSHIAKE N., HONDA K., SHIMIZU N. External Deformation Monitoring of Five Rockfill Dams in the Same Radar Satellite Data, 84th annual meeting of ICOLD, 2016. [7] SATO H., SASAKI T., KONDO M., KOBORI T., ONODERA A., YAMAGUCHI Y., YOSHIKAWA K., SANGO D., MORITA Y. Deformation monitoring of rockfill dams in normal times and after earthquakes using satellite SAR data, 85th annual meeting of ICOLD, 2017. [8] WANG T., PERISSIN D., ROCCA F., Liao M.S. Three Gorges Dam stability monitoring with time-series InSAR image analysis, Science China Earth Sciences, Vol. 54, No. 5, pp. 720-732, 2011. [9] Japan Aerospace Exploration Agency (JAXA), Advanced Land Observing Satellite 2 (ALOS-2), http://global.jaxa.jp/projects/sat/alos2/. [10] Geospatial Information Authority of Japan (GSI). Synthetic Aperture Radar Interferometry, http://vldb.gsi.go.jp/sokuchi/sar/index-e.html. [11] BERARDIO P., FORNARO G., LANARI R. and SANSOSTI E. A New Algorithm for Surface deformation Monitoring Based on Small Baseline Differential SAR Interferograms, IEEE transaction on geoscience and remote sensing, Vol. 40, No. 11, pp.2375-2383, 2002. SUMMARY It is important to develop a new method of effective and efficient monitoring of dams such as external deformation measurement of embankment dams. External deformations of nineteen rockfill dams in Japan using satellite SAR data were measured in about two years, and the results of external deformations using SAR data were compared with those by GPS or electro-optical survey data. We found that the results of external deformations using satellite SAR data agreed well with those by existing geodetic data and the average error of the external deformations between SAR and existing measurements was about five millimeters. Although external deformation monitoring of rockfill dams using satellite SAR data is generally accurate, it is important to pay attention to factors that cause reduction of the accuracy of satellite SAR based deformation monitoring such as ground surface vegetation. 817