Landslide Monitoring Using Hybrid Conventional and Persistent Scatterer Interferometry

The Kahroud region located in the Alborz Mountains, northern Iran is subject to landslide. In this paper, the impact of two different Persistent Scatterer Interferometry methods on the study area is examined. The standard Stanford method for Persistent Scatterer (StaMPS) was applied to 14 ENVISAT AS...

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Bibliographic Details
Published inJournal of the Indian Society of Remote Sensing Vol. 44; no. 4; pp. 505 - 513
Main Author Dehghani, Maryam
Format Journal Article
LanguageEnglish
Published New Delhi Springer India 01.08.2016
Subjects
deformation
Earth and Environmental Science
Earth Sciences
global positioning systems
interferometry
Iran
landslides
monitoring
mountains
remote sensing
Remote Sensing/Photogrammetry
Research Article
satellites
time series analysis
Iran
High-rate
Hybrid
Landslide
Persistent scatterer interferometry
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Summary:The Kahroud region located in the Alborz Mountains, northern Iran is subject to landslide. In this paper, the impact of two different Persistent Scatterer Interferometry methods on the study area is examined. The standard Stanford method for Persistent Scatterer (StaMPS) was applied to 14 ENVISAT ASAR images spanning between 2006 and 2008, but it was found that the displacement was underestimated due to a high deformation rate. A hybrid method that is a combination of conventional and PSI methods was then applied to the study area. In this method, the deformation rate roughly estimated by stacking the coherent interferograms characterized by small baselines was estimated and subtracted from the wrapped phase. The residual phase was then unwrapped using the standard StaMPS. The estimated rate was finally added back to the unwrapped residual phase. The maximum Line-Of-Sight (LOS) deformation rate estimated from the hybrid method was 25 mm/year, belonging to an area located in the lower part of the landslide. The deformation time series of a couple of distinct points showed differing behavior in different time periods. However, the area was still found to be generally sliding toward the satellite. These results were validated with GPS measurements at 7 stations. The Root Mean Square Error (RMSE) between LOS GPS-derived rates and rates estimated from the hybrid method was estimated as 4 mm/year.
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ISSN:0255-660X
0974-3006
DOI:10.1007/s12524-015-0536-3