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標題: Study of landslides caused by the 1999 Chi-Chi earthquake, Taiwan, with multitemporal SPOT images
作者: Lin, W.T.
Chou, W.C.
Lin, C.Y.
Huang, P.H.
Tsai, J.S.
關鍵字: geographic information-system;remotely sensed data;vegetation;pollution;ndvi;satellite;dynamics;strips;model
Project: Canadian Journal of Remote Sensing
期刊/報告no:: Canadian Journal of Remote Sensing, Volume 33, Issue 4, Page(s) 289-302.
This paper presents the results of a study of landslides and other landscape changes caused by the 1999 Taiwan Chi-Chi earthquake using multitemporal Satellite pour l'observation de la terre (SPOT) images. An innovative method for landslide detection is proposed based on the normalized difference vegetation index (NDVI) using image differencing coupled with an automated change threshold calculation. A vegetation recovery index and a land-cover spatial distribution index are also developed to assess vegetation recovery. Landslide extraction by an autodetection technique was also undertaken, yielding Kappa values over 84.16% when compared with those from existing maps. Recovery since the earthquake, despite a typhoon event in 2002, was 66,25% for vegetation in the denuded areas but less on ridge and slope surfaces. The results were verified by field surveys. The methods presented in this paper can be used by government agencies to aid in landslide-area recovery and establish effective land-use policies.
ISSN: 0703-8992
Appears in Collections:水土保持學系

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