The geomorphometry of rainfall-induced landslides in alishan area obtained by airborne lidar and digital photography

Jin King Liu*, Tian-Yuan Shih, Zu Yi Liao, Chi Chung Lau, Pai Hui Hsu

*此作品的通信作者

研究成果: Conference contribution同行評審

7 引文 斯高帕斯(Scopus)

摘要

For understanding the distribution of slope angles, OHM and roughness of the rainfall-induced landslides in Alishan Area of Central Taiwan, a survey was carried out with airborne Lidar and aerial digital camera to obtain DEM and DSM of Im grid and color orthophotos of 50cm grid. DEM, DSM and orthophotos are georeferenced and co-registered. The 106 landslide polygons derived from photointerpretation are used for extracting slopes, OHM and roughness. Results show that the average slope angle of landslides is 41 degrees with a standard deviation of 14 degrees; average OHM is 4.4m with a standard deviation of 6.3m; average roughness is 2.05m with a standard deviation of 2.56m. It is also observed that scale effects are obvious for roughness but not for slope and OHM when the grid is larger than 40m, which is the average dimension of landslides. These morphometric parameters can be further applied in the automation of landslide inventory.

原文English
主出版物標題2008 IEEE International Geoscience and Remote Sensing Symposium - Proceedings
版本1
DOIs
出版狀態Published - 1 12月 2008
事件2008 IEEE International Geoscience and Remote Sensing Symposium - Proceedings - Boston, MA, United States
持續時間: 6 7月 200811 7月 2008

出版系列

名字International Geoscience and Remote Sensing Symposium (IGARSS)
號碼1
2

Conference

Conference2008 IEEE International Geoscience and Remote Sensing Symposium - Proceedings
國家/地區United States
城市Boston, MA
期間6/07/0811/07/08

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