期刊名称：Bulletin of the Geographical Survey Institute
印刷版ISSN：0373-7160
出版年度：2003
卷号：49
出版社：Geographical Survey Institute / Ministry of Land, Infrastructure and Transport
摘要：The Geographical Survey Institute (GSI) introduced an airborne SAR system in fiscal 1996 and 1997 in order to confirm its usefulness and to develop and advance the latest technology of topographic measurement that replaces photogrammetry. The system has been experimentally operated since fiscal 1998 and one of its most dramatic results has been its observation of the volcanic island of Miyake-jima. The major purpose of the observation by the GSI-SAR was to understand the current situation of the topography of Miyake-jima that has greatly changed at the summit as a result of the series of volcanic activities that began in 2000. Another purpose is the confirmation of a new method for generating detailed DEM by single-pass interferometry of the GSI-SAR. The results were very satisfactory. The GSI succeeded in showing the cave-in topography of the summit of Miyake-jima after its eruption in 2000 and generating its DEM with 5 meters precision in height. This is one of the most successful cases to show the strong points of SAR observation because the flight was ventured under a lot of clouds and volcanic smoke. Though several issues such as funding and legal restrictions remain, the GSI-SAR has clearly been proved to be a useful tool and we should continue to improve its effectiveness.
