MONITARING LAND SUBSIDENCE BY INTERFEROMETRIC SAR

根据环境局报告的一般条件在全国地面沉降区,区域1厘米或更多的基础年沉没在日本全国特别是Chikugo和传奇平原,和特别指定是4厘米(/(年)或更多的规范和这个研究领域使地区的研究对象的数量,和地面沉降的原因是与农业用水使用。在这种情况下，本研究使用了一颗SAR卫星，并采用最高灵敏度为几分米的干涉合成孔径雷达（InSAR）作为探测方法。此外，该InSAR可以获取地表沉降发生后的地表沉降绝对值的三维信息，并取地表沉降前后三维高度数据的差值。这种处理技术被称为差分InSAR(DInSAR)，该技术是针对复杂图像进行的，并针对JERS-1/SAR的白天和晚上[1994-4-29,1994-10-22]的单视图像进行处理。在此基础上，通过对地面沉降数据的分析，得到了干涉图像、相干图像和DEM图像，认为地面沉降是长贺白石地区的一个证据，尽管地面沉降较弱，但可以对干涉条纹进行检查，并在长贺白石地区再次进行了实地调查。此外，这些结果也将用于佐贺县在这里进行的水准测试结果，与InSAR进行比较，并将公布。

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.