Vegetation recovery monitoring at landslides caused by hurricane mitch in honduras, central America

M. C. Valdez, C. F. Chen, N. T. Son, L. Y. Chang

研究成果: 書貢獻/報告類型會議論文篇章同行評審

摘要

The arrival of Hurricane Mitch in Honduras in 1998 produced damages that were unprecedented in their wide-spread nature throughout the country. Estimations indicate that landslides damaged 70% of the road network in Honduras and nearly 1,000 fatalities. Abundant vegetation and deep roots are helpful to have stable soils and to limit the amount potential of a landslide. In this study we identify landslides after Hurricane Mitch and its vegetation recovery using landsat satellite images. The study area selected was in response to the priorization developed by local authorities. In El Cajon reservoir watershed 5 counties were selected and in Choluteca River watershed 14 counties. Multidate Landsat satellite images acquired previous (1997) and after (1999) the hurricane were pre-processed and used to derive Normalized Difference Vegetation Index (NDVI). The NDVI images were subtracted and a threshold was assigned to the resultant image to identify change areas. For the thresholding image generated, filtering techniques were applied in order to eliminate undesirable change pixels. When a proper threshold was selected, it was applied to the whole study area to identify landslides. To assess the accuracy of the landslide identification, ground truth was used. The vegetation recovery of these landslides identified was calculated for two periods, 1999-2003 and 2003-2010 in the two selected study areas obtaining a very high recovery for El Cajon reservoir watershed and low recovery for Choluteca river watershed area.

原文???core.languages.en_GB???
主出版物標題31st Asian Conference on Remote Sensing 2010, ACRS 2010
頁面808-814
頁數7
出版狀態已出版 - 2010
事件31st Asian Conference on Remote Sensing 2010, ACRS 2010 - Hanoi, Viet Nam
持續時間: 1 11月 20105 11月 2010

出版系列

名字31st Asian Conference on Remote Sensing 2010, ACRS 2010
1

???event.eventtypes.event.conference???

???event.eventtypes.event.conference???31st Asian Conference on Remote Sensing 2010, ACRS 2010
國家/地區Viet Nam
城市Hanoi
期間1/11/105/11/10

指紋

深入研究「Vegetation recovery monitoring at landslides caused by hurricane mitch in honduras, central America」主題。共同形成了獨特的指紋。

引用此