| 研究生: |
陳建同 Chen, Chien-tong |
|---|---|
| 論文名稱: |
應用影像分段技術與多時段衛星影像於崩塌地植生復育成效分析研究 Studying the Effectness of Plantation Recovery at Areas of Landslide Using Image Segmentation Technique with Multi-Temporal Satellite Images |
| 指導教授: |
余騰鐸
YU, Ting-to |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 資源工程學系 Department of Resources Engineering |
| 論文出版年: | 2009 |
| 畢業學年度: | 97 |
| 語文別: | 中文 |
| 論文頁數: | 80 |
| 中文關鍵詞: | 福衛二號 、常態化差異植生指數 、物件式導向 、影像分割 、植生 、復育 |
| 外文關鍵詞: | Object-oriented, FormoSat-2, Image segmentation, Plantation, Reclamation, NDVI |
| 相關次數: | 點閱:142 下載:4 |
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崩塌地的治理與保育為水庫集水區經營之重要項目,隨著遙感探測技術的發展,各類遙測資料與技術廣泛應用於環境災害監測。本研究利用四幅不同時期福衛二號影像以常態化差異植生指數與植生覆蓋因子,在崩塌地有植生工程與自然復育下進行不同時期植生變遷狀況監測評析。
本研究首先嘗試使用一種結合空間相關資訊和光譜資訊技術–物件式導向法,以物件式法則進行影像分塊以及區塊分類兩個步驟,萃取崩塌地區塊。在影像分塊中,原始影像經影像分塊步驟後產生由眾多區塊組成的區塊影像;在區塊分類步驟中,利用知識庫系統,對區塊影像中的各個區塊進行類別的判釋。最後得到最優分割尺度參數之權重;分塊尺度參數:10、光譜影像權重參數:0.8、DTM權重參數:0.2、顏色因子參數:0.9、形狀因子參數:0.1、緊緻度參數:0.9、光滑度參數:0.1。
研究結果顯示,崩塌地有進行植生工程復育,NDVI值皆高於自然復育,以案例二:型框工法植生效果為佳,鋪網噴植工法因強降雨造成植生面積破壞,成效不如型框工法。本研究利用福衛二號影像進行崩塌地植生變遷分析,雖空間解析度仍未足以達到完善之調查,但對於有進行植生工法的工程,已可以由常態化差異植生指數,進行大範圍遠距之成效調查。
Reclamation and management of landslides is the top priority for administration of catchment in Taiwan. Along the rapid improvement of remote sensing techniques, several aspects about environmental monitoring are widely adopted such methodology. There are four different FormoSat-2 images used at this study with NDVI to detect the factors in controlling the plantation coverage temporally. Purpose of this arrangement is to compare and also monitoring the effeteness of reclamation for the region of watershed with artificial or natural plantation.
Method of Object-oriented classification is introduced to perform the precise analysis here; this method combines both the texture of imagery and object properties to gather better accuracy in boundaries of area for landslide than traditional task. Raw image was separated into many subsets throughout the setup procedures, with help of knowledge base that each of subset was team up with property’s identification to perform the appropriated test for every object. By many trial and errors, it is concluded that for this data set the most acceptable weighting of segmentation scale parameters is 10, 0.8 of spectrum weighing, 0.2 for DTM, 0.2 for color, 0.9 for shape, 0.1 for compactness and 0.1 for smoothness, respectively.
As the result shows, the NDVI of reclamation area is higher than natural recovery that means the measurement applied for such region is effective. In the case NO. 2,the method of pre-casted concrete have better outcome than green revetment, since the strong rainfall wash away the grass that didn’t covered by concrete frame. Resolution of FormoSat-2 image may not adequate to reveal all the detail phenomena regarding to evaluate the effeteness of reclamation directly, nevertheless with objective classification method we still can achieve the goal to handle such task remotely and precisely.
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