Successful Applications of Generic Atmospheric Correction Online Service for InSAR (GACOS) to the Reduction of Atmospheric Effects on InSAR Observations

doi:10.11947/j.JGGS.2021.0113

测绘学报（英文版） ›› 2021, Vol. 4 ›› Issue (1): 109-115.doi: 10.11947/j.JGGS.2021.0113

收稿日期:2020-10-10 接受日期:2020-12-25 出版日期:2021-03-20 发布日期:2021-04-06

Successful Applications of Generic Atmospheric Correction Online Service for InSAR (GACOS) to the Reduction of Atmospheric Effects on InSAR Observations

Chen YU¹(),Zhenhong LI^1,^2,³(),Lin BAI^2,³,Jan-Peter MULLER⁴,Jingfa ZHANG⁵,Qiming ZENG⁶

1. COMET, School of Engineering, Newcastle University, Newcastle upon Tyne NE1 7RU, UK
2. College of Geological Engineering and Geomatics, Chang’an University, Xi’an 710061, China
3. Key Laboratory of Western China’s Mineral Resources and Geological Engineering, Ministry of Education, Xi’an 710054, China
4. Mullard Space Science Laboratory, Department of Space & Climate Physics, University College London, Holmbury St Mary RH5 6NT, UK
5. Key Laboratory of Crustal Dynamics, Institute of Crustal Dynamics, China Earthquake Administration, Beijing 100085, China
6. School of Earth and Space Sciences, Peking University, Beijing 100871, China

Received:2020-10-10 Accepted:2020-12-25 Online:2021-03-20 Published:2021-04-06
Contact: Zhenhong LI E-mail:chen.yu@ncl.ac.uk;zhenhong.li@chd.edu.cn
About author:Chen YU (1990-), male, PhD student, majors in geodesy. E-mail: chen.yu@ncl.ac.uk
Supported by:
National Natural Science Foundation of China(41941019);Fundamental Research Funds for the Central Universities(300102260301/087);Fundamental Research Funds for the Central Universities(300102260404/087)

摘要/Abstract

Abstract:

The tremendous development of Synthetic Aperture Radar (SAR) missions in recent years facilitates the study of smaller amplitude ground deformation over greater spatial scales using longer time series. However, this poses greater challenges for correcting atmospheric effects due to the wider coverage of SAR imagery than ever. Previous attempts have used observations from Global Positioning System (GPS) and Numerical Weather Models (NWMs) to separate atmospheric delays, but they are limited by ①The availability (and distribution) of GPS stations; ②The low spatial resolution of NWM; And ③The difficulties in quantifying their performance. To overcome these limitations, we have developed the Generic Atmospheric Correction Online Service for InSAR (GACOS) which utilizes the high-resolution European Centre for Medium-Range Weather Forecasts (ECMWF) products using an Iterative Tropospheric Decomposition (ITD) model. This enables the reduction of the coupling effects of the troposphere turbulence and stratification and hence achieves equivalent performances over flat and mountainous terrains. GACOS comprises a range of notable features: ①Global coverage; ②All-weather, all-time usability; ③Available with a maximum of two-day latency; And ④Indicators available to assess the model’s performance and feasibility. In this paper, we demonstrate some successful applications of the GACOS online service to a variety of geophysical studies.

Key words: InSAR, atmospheric correction, GACOS, earthquake, volcano, landslide, city subsidence

. [J]. 测绘学报（英文版）, 2021, 4(1): 109-115.

Chen YU,Zhenhong LI,Lin BAI,Jan-Peter MULLER,Jingfa ZHANG,Qiming ZENG. Successful Applications of Generic Atmospheric Correction Online Service for InSAR (GACOS) to the Reduction of Atmospheric Effects on InSAR Observations[J]. Journal of Geodesy and Geoinformation Science, 2021, 4(1): 109-115.

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参考文献 22

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Successful Applications of Generic Atmospheric Correction Online Service for InSAR (GACOS) to the Reduction of Atmospheric Effects on InSAR Observations

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