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題 名 | Using Ground-based LiDAR Data to Measure Standing Trees in a Red Cypress Plantation=應用地面光達資料於紅檜人工林立木測計 |
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作 者 | 魏浚紘; 陳朝圳; 陳建璋; 吳守從; | 書刊名 | 臺灣林業科學 |
卷 期 | 29:3 2014.09[民103.09] |
頁 次 | 頁169-178 |
分類號 | 436.7 |
關鍵詞 | 森林經營; 光達技術; 林分結構; 不同高度直徑模擬; Forest management; LiDAR technology; Stand characteristics; Diameter simulations at different heights; DSDHs; |
語 文 | 英文(English) |
中文摘要 | 光達系統有能力針對單木結構進行非破壞性紀錄,且藉地面光達系統獲得森林的三維資訊是一種快速而普遍的方式。本研究藉由地面光達與傳統野外調查資料來獲得樣區內每株林木的樹高、胸徑(dbh)、立木位置以及不同高度直徑模擬(DSDH),同時藉統計分析與預測模型評估地面光達資料於森林地區應用之可行性以俾繪製三維林木位置。三維資訊之準確性透過野外24株林木之調查結果與光達資料進行比較,結果顯示X軸誤差範圍介於0.020~0.796 m,Y軸誤差範圍介於0.007~1.774 m。儘管兩種林木資料有著差異性,但其間還是具有良好的相關性,例如光達測量之樹高與實際測量之樹高,兩者有著高度的相關性(RMSE = 0.2584),且光達測量之胸徑與實際測量之胸徑亦有著高度的相關性(RMSE=0.7632);此外,透過三株立木位置準確且樹冠底下無遮蔽之林木,發現地面光達可進行高準確性的直徑模擬。本研究比較光達與傳統調查方法,結果顯示即使在不同的測量位置,以地面光達進行調查值得期待,其運用於測量林木之外部與結構特徵,包括樹高、胸徑、不同高度直徑模擬與立木位置圖確實可行。 |
英文摘要 | The three-dimensional (3D) scanning light detection and ranging (LiDAR) system is able to make non-destructive transcriptions of individual tree structures. Gaining 3D information on a forest using a ground-based LiDAR system is a swift and popular method. This study used groundbased LiDAR data and traditional data of field surveys to obtain individual tree characteristic values, such as tree height, diameter at breast height (dbh), individual tree location, and diameter simulations at different heights (DSDHs). This study estimated the feasibility using LiDAR data in a forest area and a predictive model, for mapping individual 3D tree positions. To analyze the accuracy of the determined 3D information, results of 24 investigated trees in a field survey were compared to those using laser scanning. The results showed directional errors of 0.020~0.796 m in the X direction and 0.007~1.774 m in the Y direction. Although the trees were heterogeneous, the results showed good correlations of the LiDAR tree height with field tree height (root mean squared error (RMSE)=0.2584) and the LiDAR DBH with field DBH (RMSE=0.7632). We also found high accuracy in diameter simulations without occlusion. Comparing the LiDAR results with traditional methods showed that the new survey method developed can be pragmatically applied to different measurement fields. The LiDAR-based measurement system in this study was proven to be a valuable tool for measuring physical and structural characteristics of plants, such as tree height, dbh, diameter simulations, and individual tree location maps. |
本系統中英文摘要資訊取自各篇刊載內容。