Satellite Image Analyses of Debris Flow Areas in Keelung

• Main Author: 蔡曉君
• Other Authors: Chung-Ru Ho
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/96848494621066892742

碩士 === 國立臺灣海洋大學 === 海洋環境資訊學系 === 96 === The purpose of this thesis is to detect the changes of debris areas in Keelung using satellite images. There are three images applied in this study including a SPOT-4 image of June 29, 2001 (the date before Nali typhoon), a SPOT-2 image of April 21, 2004 (the date between Nali typhoon and Natan typhoon) and a FORMOSAT-2 image of May 9, 2007(the date after Natan typhoon). According to the information from the Fire Bureau of Keelung, there are 19 warning areas of mudflows and landslides in Keelung. We choose 10 areas where are larger areas and can be easier analyzed. The result shows that the areas of building and forest are much more than the areas of bare lands after a time-span. It indicates that the landslide areas have been treated well. This is confirmed by ground surveys.