Combining Application of TOPS and ScanSAR InSAR in Large-Scale Geohazards Identification

LIU Bin; GE Daqing; WANG Shanshan; LI Man; ZHANG Ling; WANG Yan; WU Qiong

doi:10.13203/j.whugis20200259

Volume 45 Issue 11

Nov. 2020

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Geomatics and Information Science of Wuhan University > 2020 > 45(11): 1756-1762. > DOI: 10.13203/j.whugis20200259

LIU Bin, GE Daqing, WANG Shanshan, LI Man, ZHANG Ling, WANG Yan, WU Qiong. Combining Application of TOPS and ScanSAR InSAR in Large-Scale Geohazards Identification[J]. Geomatics and Information Science of Wuhan University, 2020, 45(11): 1756-1762. DOI: 10.13203/j.whugis20200259

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Combining Application of TOPS and ScanSAR InSAR in Large-Scale Geohazards Identification

1.
China Aero Geophysical Survey and Remote Sensing Center for Land and Resources, Beijing 100083, China

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The National Key Research and Development Program of China 2017YFB0502700

the National Natural Science Foundation of China 41504048

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Author Bio:
LIU Bin, PhD, senior engineer, specializes in data processing of space-borne and ground-based InSAR techniques. E-mail: lbin0226@163.com
Corresponding author:
LI Man, senior engineer. E-mail: digong820@163.com
Received Date: May 28, 2020
Published Date: November 18, 2020

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Abstract

Objectives InSAR technique has the ability to detect small deformation of the earth's surface. However, it is still a great challenge to identify the potential geohazards using InSAR in wide area. How to obtain reliable InSAR products in "large-scale, fast and economic" is still the key work of general survey for geohazards identification.
Methods Sentinel-1 TOPS and ALOS-2 ScanSAR data have large-wide swaths of hundreds of kilometers. Therefore, range split spectrum, Stacking-InSAR and other technologies are comprehensively used to identify geohazards using Sentinel-1 TOPS and ALOS-2 ScanSAR data in the Jinsha River area from Panzhihua City to Wudongde hydropower station. Firstly, sub-swath images of ScanSAR are processed with each other by differential interferometry, and range split spectrum method is used to estimate and compensate ionospheric delay for SAR interferometry.Then, TOPS full swath ima- ges are processed with perpendicular and temporal baselines of less than 200 m and 60 d, respectively. Finally, linear deformation rates of TOPS and ScanSAR data are estimated using Stacking-InSAR technique.
Results Forty-six potential geohazards are identified using Sentinel-1 TOPS data (January 2018 to January 2019), and ALOS-2 ScanSAR data (February 2017 to February 2020) have identified forty-four potential geohazards. Field investigations show that there are almost deformation phenomena in the location of identified geohazards by InSAR.
Conclusions The combined applications of TOPS and ScanSAR modes can fully grasp the situation of geological hazards as far as possible.

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Combining Application of TOPS and ScanSAR InSAR in Large-Scale Geohazards Identification

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