Estimation of Precipitable Water for Improving Land Subsidence Accuracy Using DInSAR Technique

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Year:
2016
Type of Publication:
In Proceedings
Keywords:
Precipitable water, Differential SAR interferometry, Atmospheric delay
Authors:
Maeda, Naoya; Susaki, Junichi; Akatsuka, Shin
Abstract:
Differential SAR interferometry (DInSAR) technique can quantitatively measure surface subsidence by using the phase difference at each pixel derived from multi-temporal SAR images. However, the phase difference contains several types of errors. Atmospheric delay is a major source of errors for surface subsidence estimation. In this study, we examined the availability of precipitable water (PW) as external data which indicates directly atmospheric state for the purpose of improving DInSAR. In the proposed method, we estimate spatially and temporally high resolution of PW, and calculate atmospheric delay at each pixel with estimated PW. The image of the atmospheric delay of each interferogram is acquired by taking a difference between the value of master image and that of slave image. This image indicates the state of atmosphere which changes by time and place, and we succeeded in making the image related to atmospheric error. In addition, we showed the possibility that we could remove the atmospheric error and improve accuracy of DInSAR by the proposed method.
Full text: Ab 0219.pdf [Bibtex]
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