Estimating dike elevation from multi-temporal SAR images for efficient dike management
Estimating dike elevation from multi-temporal SAR images for efficient dike management
复制标题
从多时相 SAR 图像估计堤坝高程以实现有效的堤坝管理
DOI：
10.1109/igarss.2019.8898110
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Takuma Anahara
中科院分区：
文献类型：
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作者：
Takaya Kusakabe;Junichi Susaki;Takuma Anahara
在日本，法律要求对沿着的堤坝进行管理，即沿堤坝长度以不超过沿着200米的间隔进行定期测量。由于日本有如此多的堤坝需要测量，因此需要一种有效的测量方法。本文介绍了使用多时相合成孔径雷达（SAR）图像的堤坝高程估计的结果和精度。首先，通过对在上升和下降轨道上观测到的SAR图像应用持续散射体干涉测量法，计算沿雷达视线方向的位移沿着。然后将最小二乘法应用于这些结果，并通过假设没有发生南北位移来估计东西和垂直位移速度。最后，将位移速度乘以选定的时间段，并通过添加已知的初始高程来获得该时间段结束时的高程。试验结果表明，堤顶高程的均方根误差为5.3cm，而堤坡高程的均方根误差超过25cm。结果表明，该方法对堤顶监测是有效的，堤坡高程的精度有待提高。
In Japan, dikes along rivers are required by law to be managed by surveying them periodically at intervals of no more than 200 m along their length. Because Japan has so many dikes to survey, an efficient surveying approach is needed. This paper presents the results and accuracy of dike elevation estimation using multi-temporal synthetic aperture radar (SAR) images. First, the displacement along the radar line-of-sight direction was calculated by applying persistent-scatterer interferometry to SAR images observed on ascending and descending orbits. The least-squares method was then applied to those results, and the east-west and vertical displacement velocities were estimated by assuming that no north-south displacement occurred. Finally, the displacement velocity was multiplied by a chosen time period, and the elevation at the end of that time period was obtained by adding the known initial elevation. The experimental results show that the root-mean-square error of the elevation of the dike crown was 5.3 cm whereas that of the dike slope exceeded 25 cm. It is concluded that the presented approach is effective for monitoring the dike crown, and the accuracy of the elevation of the dike slope is expected to improve.