Long-range ground deformation monitoring by InSAR analysis
InSAR (Interferometric Synthetic Aperture Radar) analysis is an effective technique to map 3-dimensional surface deformation with high spatial resolution. The aim of this study was to evaluate the capability of InSAR analysis when applied to ground monitoring of an environmental disaster. We per...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2015-11-01
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| Series: | Proceedings of the International Association of Hydrological Sciences |
| Online Access: | https://www.proc-iahs.net/372/343/2015/piahs-372-343-2015.pdf |
| Summary: | InSAR (Interferometric Synthetic Aperture Radar) analysis is an effective
technique to map 3-dimensional surface deformation with high spatial
resolution. The aim of this study was to evaluate the capability of InSAR
analysis when applied to ground monitoring of an environmental disaster. We
performed a time series InSAR analysis using ENVISAT/ASAR and ALOS/PALSAR
data and commercial software to investigate subsidence around the Kanto
District of Japan. We also investigated techniques for efficient early
detection of landslides in Kyushu using time series analysis that
incorporated synthetic aperture radar (SAR) images. ENVISAT/ASAR data
acquired from 2003–2010 and ALOS/PALSAR data acquired from 2006–2011 were
used to detect poorly expressed geomorphological deformation by conducting
time series analyses of periodically acquired SAR data. In addition, to
remove noise caused by geographical feature stripes or phase retardation, we
applied median filtering, histogram extraction processing, and clarification
of the displacement with a Laplacian filter. The main functions of the InSAR
time series analysis are the calculation of phase differences between two
images and the inversion with smoothness constraint for the estimation of
deformation along the line of sight. The results enabled us to establish
criteria for the selection of suitable InSAR data pairs, and provided the
final error estimation of the derived surface deformation. The results of
the analysis in the Kanto District suggested that localized areas of uplift
and subsidence have occurred at irregular intervals in this area.
Furthermore, the method offers the possibility of early warning of
environmental disasters such as landslide and abrupt subsidence. Our results
confirm the effectiveness of InSAR analysis for the monitoring of ground
deformation over wide areas via the detection of localized subsidence and
landslides. |
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| ISSN: | 2199-8981 2199-899X |