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ISPRS Int. J. Geo-Inf. 2017, 6(10), 293; doi:10.3390/ijgi6100293

Geo-Hazard Detection and Monitoring Using SAR and Optical Images in a Snow-Covered Area: The Menyuan (China) Test Site

1
School of Earth Science and Engineering, Hohai University, Nanjing 211100, China
2
Earthquake Administration of Qinghai Province, Xining 810001, China
*
Author to whom correspondence should be addressed.
Received: 12 July 2017 / Revised: 14 September 2017 / Accepted: 18 September 2017 / Published: 21 September 2017
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Abstract

In this work, we combine SAR and optical images for geo-hazard detection and monitoring in Western China. An extremely small baseline of C-band SAR image pairs acquired from Sentinel-1A at Menyuan, China, is analyzed. Apart from the large area of coseismal deformation, we proposed an earthquake-derived landslide detecting method by removing the coseismal deformation with polynomial fitting, then the detected moving areas were confirmed with Chinese Gaofen-1 optical satellite images. Sentinel-1A C-band interferograms show about a 7-cm line of sight movement caused by the MS 6.4 Menyuan earthquake; meanwhile, several features indicative of ground movement were detected by the proposed method and demonstrated by the Gaofen-1 optical images; the interpretation of high-resolution optical data complemented the goal of better understanding the behavior of geo-hazard disasters. InSAR time series analysis provides an opportunity for continuous monitoring of geo-hazards in remote areas, while the optical image method is easily affected by decorrelation due to snowfall. View Full-Text
Keywords: Menyuan MS 6.4 earthquake; SAR interferometry; Sentinel-1; Gaofen-1 satellite; geo-hazards Menyuan MS 6.4 earthquake; SAR interferometry; Sentinel-1; Gaofen-1 satellite; geo-hazards
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Huang, Q.; Wang, Y.; Xu, J.; Nishyirimbere, A.; Li, Z. Geo-Hazard Detection and Monitoring Using SAR and Optical Images in a Snow-Covered Area: The Menyuan (China) Test Site. ISPRS Int. J. Geo-Inf. 2017, 6, 293.

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