Abstract
More and more synthetic aperture radar (SAR) satellites in orbit provide abundant data for remote sensing applications. In August 2016, China launched a new Earth observation SAR satellite, Gaofen-3 (GF-3). In this paper, we utilize a small stack of GF-3 differential interferograms to map land subsidence in Beijing (China) using the time-series SAR interferometry (InSAR) technique. The small stack of differential interferograms is generated with 5 GF-3 SAR images from March 2017 to January 2018. Orbit errors are carefully addressed and removed during differential InSAR (DInSAR) processing. Truncated singular-value decomposition (TSVD) is applied to strengthen the robustness of deformation rate estimation. To validate the results of GF-3 data, an additional deformation measurement using 26 Sentinel-1B images from March 2017 to February 2018 is carried out using the persistent scatterer interferometry (PSI) technique. By implementing a cross-comparison, we find that the retrieved results from GF-3 images and Sentinel-1 images are spatially consistent. The standard deviation of vertical deformation rate differences between two data stacks is 11.24 mm/y in the study area. The results shown in this paper demonstrate the reasonable potential of GF-3 SAR images to monitor land subsidence.
Highlights
Synthetic aperture radar (SAR) has been widely used for Earth remote sensing for more than 30 years
The results demonstrate the reasonable potential of GF-3 SAR to monitor surface deformation
The flat-earth phase was removed from the original interferogram (see Figure 3(a)) according to the initial baseline
Summary
Synthetic aperture radar (SAR) has been widely used for Earth remote sensing for more than 30 years. More than 15 spaceborne SAR sensors are being operated and several new SAR systems are under development or in planning [1, 2]. On November 19, 2012, China launched its first civil SAR satellite with an S-band imaging radar onboard, HuanJing-1C (HJ-1C) [3]. HJ-1C is the third satellite of China’s Environmental Protection and Disaster Monitoring Constellation. The overall objective of this constellation is to establish an operational Earth observing system for disaster monitoring and mitigation using remote sensing technology. On August 9, 2016, the Gaofen-3 (GF3) high-resolution satellite was launched from the Taiyuan Satellite Launch Center. The Gaofen satellite series began in 2013 and are part of the China High-resolution Earth
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