| 研究生: |
劉晃丞 Liu, Huang-Chen |
|---|---|
| 論文名稱: |
應用高程差與福衛二號影像共同判釋新崩塌地 Interpretation of New Landslide by Elevation Difference & FORMOSAT-2 Satellite Image |
| 指導教授: |
曾清涼
Tseng, Ching-Liang |
| 學位類別: |
碩士 Master |
| 系所名稱: |
理學院 - 地球科學系 Department of Earth Sciences |
| 論文出版年: | 2006 |
| 畢業學年度: | 94 |
| 語文別: | 中文 |
| 論文頁數: | 81 |
| 中文關鍵詞: | 崩塌地判釋 、LiDAR 、DEM |
| 外文關鍵詞: | landslide Interpretation, LiDAR, DEM |
| 相關次數: | 點閱:89 下載:6 |
| 分享至: |
| 查詢本校圖書館目錄 查詢臺灣博碩士論文知識加值系統 勘誤回報 |
台灣水土保持長期受到忽視,921地震更導致山區土石鬆散。近年來受到環境變遷的影響,將造成山區更容易因豪大雨產生山崩、地滑以及洪水等災害,造成大量財務損失和人員傷亡;因此政府極力推廣將遙測技術應用於土石流地區地表資料的建立,以便獲得災前預防、災時減災、災後重建之量化分析,提供相關防治單位擬定策略及參考依據,將災害損失減至最小。
過去研究主要以40m的DEM及SPOT等衛星影像為工具,但礙於DEM解析度不足以及特定時間衛星影像的取得不便,易造成研判上的誤差,其中40m DEM只能表示出地表大略的起伏,解析度過於粗糙而無法作進一步的地表變化探討。
本論文使用較高解析度之LiDAR DEM以及福衛二號衛星影像,其自主性較高,有助於取得更精確的土方體積及特定時間範圍衛星影像,如此更能準確判斷崩塌地之規模、地貌、災區擴大情形,以便進一步預防土石災害的發生。
研究方法將比較多時DEM(LiDAR DEM與5m平面解析度航空攝影測量DEM),並計算特定區域災前與災後的地表高程差值,配合土石流體積計算公式求得地表崩塌量及堆積量,由此評估地表受到侵蝕的程度;並同時結合影像自動判釋圖、在地理資訊系統(GIS)上進行套疊並配合空間分析技術,可以判定植生不良及鄰近人文活動區為水土保持加強地區,以便持續提供治山防災及坡地管理資訊。
The soil and water conservation in Taiwan was ignored for a long time; the 921 earthquake in 1999 caused the soil of mountain area become weak. Because of the environment has changed in these years and the torrential rain in mountain area leads the landslide, flood water and other damages, these brought many financial cost and human toll. In order to prevent the disaster, reduce the damage, increase the effect of reconstruction after the damage and quantify it, our government popularized building the terrain data of the landslide area by using the remote sensing technique to offer the affiliated organizations make policy and lower the disaster.
In the past research, we use the 40m DEM (Digital Elevation Model) and SPOT satellite image as tools, but the resolution of 40m DEM is too rough to do any land analysis, and the specific time of SPOT satellite images are not easily to get. These will influence the accuracy of judgment seriously.
In the cause of prevent landslide hazard, this research will use LiDAR DEM with higher resolution and the FORMOSAT-2 satellite image which is more autonomous, hence we can get more accurate soil volume and specific satellite image of Taiwan, and then evaluate the scale of landslides, enhance the detail of the spatial and display the distribution of disaster area.
The researching method will compare multi-temporal DEM (LiDAR DEM & Airborne 5m DEM), and compile the diversity of the DEM in specific area, calculate sediment produce rate by using the debris volume formula, thus evaluate the erosion extent of the researching area. At the same time, using image automatic interpretation, and telescope them into GIS software with spatial analyst tools, after these we can find dys-vegetation area as soil and water conservation enhanced area, so as to keep providing the slopes management and prevention of landslide hazard information.
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