| Budget Amount *help |
¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 2002: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2001: ¥700,000 (Direct Cost: ¥700,000)
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| Research Abstract |
According to the Environment Agency Report on the general condition of the land subsidence area in the whole country, the area where 1cm or more foundation of years sank in the Japan whole country is remarkable especially in Chikugo and the Saga plain, and is especially specified to be a 4cm[/(year] or more specification area and which this research makes the amount region of an object of research, and the cause of the land subsidence is reported in connection with water for agricultural use. In such a situation, this research uses a SAR satellite, and adopts the Interferometric Synthetic Aperture Radar(InSAR) called highest sensitivity of several cent meters as the detection method.
Furthermore, the 3-dimensional information on the absolute value of land subsidence can be acquired by this InSAR after land subsidence takes place, and taking the difference of 3-dimensional altitude data before and after land subsidence. This processing technology is called as Differential InSAR(DInSAR), which was performed for complex images, and carried out for single look image processing of the day evening[1994-4-29,1994-10-22] of JERS-1/SAR. Furthermore, an interferometric picture, a coherence picture, and DEM image were obtained as a result of analyzing data, being based on land subsidence, which is considered an evidence in the Saga Shiraishi district, though it was weak, interference fringes could be checked Furthermore, for the check, the field survey in the Shiraishi district was carried out again. Moreover, these results are due for the leveling result which here Saga Prefecture performed to also come to hand, to perform comparison with InSAR, and to be released.
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