NDLI: Classification of landslide surfaces using fully polarimetric SAR: examples from Taiwan

Content Provider	IEEE Xplore Digital Library
Author	Rodriguez, K.M. Weissel, J.K. Kim, Y.
Copyright Year	2002
Description	Author affiliation: Lamont-Doherty Earth Obs., Columbia Univ., USA (Rodriguez, K.M.; Weissel, J.K.)
Abstract	Landslides typically denude forested hillsides, changing dominant scattering from multiple- to single-bounce. SAR polarimetry can be used to determine the dominant scattering mechanism of the terrain on a per pixel basis. Thus, hillslopes affected by landslides may be distinguished easily from adjacent, unaffected hillslopes. Based on the polarimetric eigenvalue decomposition and the relative amplitudes of scattering matrix terms, dominant scattering mechanisms can be determined. These mechanisms - odd- or single-bounce (bare surface), double- or even-bounce, and volume (diffuse) scattering - describe the total radar returns for each pixel. The modified approach of Kim and van Zyl (2001) include the radar vegetation index, pedestal height and entropy, all representative of forest. Our analysis follows Kim and van Zyl to reveal that at L-band, the landslide scar areas of the Tsaolong and Mt. Jou-Feng-Err mega-slides are dominated by single-bounce scattering and the surrounding forested regions are dominated by volume scattering. In addition, fully polarimetric SAR is sensitive to reforestation in tropical jungle environments as demonstrated by comparison with a panchromatic Indian Remote Sensing (IRS) image. Inversion of SAR polarimetry for terrain scattering mechanisms offers a new approach for landslide mapping that has significant operational advantages over traditional methods that rely on optical sensors for rapid response to and management of landslide disasters.
Sponsorship	IEEE IEEE Geosci. & Remote Sensing Soc. Canadian Remote Sensing Soc. Univ. Waterloo Natural Resources Canada (NRCan) Canadian Space Agency (CSA) Environ. Canada NASA Nat. Oceanic & Atmos. Adm. (NOAA) Office of Naval Res.(ONR) Nat. Space Dev. Agency of Japan (NASDA) Nat. Polar-orbiting Environ. Satellite Syst. (NPOESS)
Starting Page	2918
Ending Page	2920
File Size	298340
Page Count	3
File Format	PDF
ISBN	078037536X
DOI	10.1109/IGARSS.2002.1026821
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2002-06-24
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Terrain factors Radar scattering Optical scattering Eigenvalues and eigenfunctions Matrix decomposition Radar polarimetry Vegetation mapping Entropy L-band Remote sensing
Content Type	Text
Resource Type	Article

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