MONITARING LAND SUBSIDENCE BY INTERFEROMETRIC SAR

根据环境厅关于全国地面沉降区概况的报告，日本全国地面沉降量超过1厘米的地区尤其是千岛和佐贺平原非常显著，特别是被指定为4厘米[/(年)]或更高规格的地区，本研究将其作为研究对象，并与农业用水有关地报告了地面沉降的原因。在这种情况下，本研究利用合成孔径雷达(SAR)卫星，采用被称为最高灵敏度几分米的干涉合成孔径雷达(InSAR)作为探测方法，并利用地面沉降发生后的三维高程数据的差异，获取地面沉降绝对值的三维信息。这种处理技术被称为差分InSAR(DInSAR)，它是对复数图像执行的，并且针对JERS-1/SAR的白天晚上的单视图像处理[1994-4-29,1994-10-22]。在此基础上，以佐贺白石区的地面沉降量为依据，分析得到了干涉图、相干图和DEM图像，这被认为是佐贺白石区的证据，虽然很弱，但干涉条纹是可以检查的。此外，这些结果是由于佐贺县在这里进行的水准测量结果也是现成的，与InSAR进行了比较，并将发布。

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.