結合空載LiDAR與航測高程資料應用於地形變化偵測

Terrain Change Detection Combined Photogrammetric DEM and Airborne LiDAR Data

蕭國鑫(Kuo-Hsin Hsiao) ； 劉進金(Jin-King Liu) ； 游明芳(Ming-Fong Yu) ； 陳大科(Da-Ko Cheng) ； 徐偉城(Wei-Chen Hsu) ； 王晉倫(Chin-Lun Wang)

《航測及遙測學刊》 11卷3期 (2006/09) Pp. 283-295

https://doi.org/10.6574/JPRS.2006.11(3).5

摘要

本研究利用兩次的空載LiDAR資料，研判2004年敏都莉颱風前、後之九份二山地形變化；並結合40公尺網格DEM及2003年航測高程資料，分析921地震前、後的整體地形差異。初步結果為：(1)921地震後疊合40公尺網格DEM與2002年空載LiDAR掃描資料，估算九份二山順向坡崩塌區平均下降深度約34.0公尺，體積減少3,284.76萬立方米；堆積區平均高度上昇36.7公尺，體積增加3,776.88萬立方米；而地震後至2003年間，順向坡崩塌區地形變化不明顯。(2)2004年敏都莉颱風過境後，比對兩次高解析空載LiDAR資料，研判九份二山西南側與南側再度發生崩塌，最大崩塌深度達20公尺；崩塌區東側之趾部河道區則堆積了4~8公尺，堆積土石量達279,177立方米。(3)九份二山人工渠道末端，注入韮菜湖溪處的河道於敏都莉颱風後，亦發生河道崩塌侵蝕現象，崩塌深度接近15公尺，崩塌體積達98,604立方米。

關鍵字

崩塌地 ； 數值高程資料 ； 光達

並列摘要

The study area is located in the 1999 Ji-Ji Earthquake disaster area of central TAIWAN. Two times of airborne laser scans were conducted in 2002 and 2005 and, thus, the change of terrain in this period is examined. There have been 3 typhoon events and one torrential rainfall event in this period of time. When the DEM derived by 2002 LiDAR data was compared to the photogrammetric data in 1987, a change of 34.0 m in height and 3,284.76*10^6 m^3 in quantity were observed in the Gio-Fen-Erh-San Slide due to the earthquake event. The change of height from 2002 to 2003 is not obvious, which could be due to erosion process is slowly. After Min-Do-Lle typhoon in June, 2004. A significant slide process is observed at the south-west and south areas of Gio-Fen-Erh-San slide, where the maximum difference in depletion is about 20 m. The height difference of accumulation is circa 4~8 meters and an earth volume change of 279,177 cubic meters were estimated at the eastern riverbed.

並列關鍵字

Landslides ； Digital Terrain Model DTM ； LiDAR