School of Geosciences and Info-Physics, Central South University, Changsha 410083, China.
Sensors (Basel). 2019 Sep 10;19(18):3894. doi: 10.3390/s19183894.
The Generic Atmospheric Correction Online Service (GACOS) products for interferometric synthetic aperture radar (InSAR) are widely used near-real-time and global-coverage atmospheric delay products which provide a new approach for the atmospheric correction of repeat-pass InSAR. However, it has not been determined whether these products can improve the accuracy of InSAR deformation monitoring. In this paper, GACOS products were used to correct atmospheric errors in short baseline subset (SBAS)-InSAR. Southern California in the U.S. was selected as the research area, and the effect of GACOS-based SBAS-InSAR was analyzed by comparing with classical SBAS-InSAR results and external global positioning system (GPS) data. The results showed that the accuracy of deformation monitoring was improved in the whole study area after GACOS correction, and the mean square error decreased from 0.34 cm/a to 0.31 cm/a. The improvement of the mid-altitude (15-140 m) point was the most obvious after GACOS correction, and the accuracy was increased by about 23%. The accuracy for low- and high-altitude areas was roughly equal and there was no significant improvement. Additionally, GACOS correction may increase the error for some points, which may be related to the low accuracy of GACOS turbulence data.
大气通用校正在线服务（GACOS）产品是干涉合成孔径雷达（InSAR）的一种广泛应用的近实时、全球覆盖的大气延迟产品，为重复轨道 InSAR 的大气校正提供了一种新方法。然而，尚未确定这些产品是否可以提高 InSAR 形变监测的精度。本文利用 GACOS 产品对短基线子集（SBAS）-InSAR 的大气误差进行了校正。以美国南加州为研究区，通过与经典 SBAS-InSAR 结果和外部全球定位系统（GPS）数据进行对比，分析了基于 GACOS 的 SBAS-InSAR 的效果。结果表明，GACOS 校正后整个研究区的形变监测精度得到了提高，平均均方根误差从 0.34cm/a 减小到 0.31cm/a。GACOS 校正后中高度（15-140m）点的改进最为明显，精度提高了约 23%。低空和高空区域的精度大致相同，没有明显提高。此外，GACOS 校正可能会增加某些点的误差，这可能与 GACOS 湍流数据的低精度有关。
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