調查岩石邊坡結構之傳統方法多以人工使用地質羅盤直接量測為主，或應用掃描線法與觀測窗法等系統性方式，配合全測站或GPS進行定位，並以影像輔助製作構造資料圖。但在不穩定之邊坡進行量測皆須在高危險性工作環境下耗費大量的時間和人力資源。本研究使用高效率且高機動性之車載光達系統替代傳統資料蒐集程序，在短時間內可取得更大範圍之資料，大幅降低停留在危險區域的時間，再以半自動化程序，定量分析特定公路邊坡之穩定性。
本研究主要探討在光達資料上濾除坡面上生長之植物，並儘量保留內部遭覆蓋之岩石位態資料，以提供更完整的地質層面構造資訊供後續分析。資料測試區域為台8線太魯閣路段旁岩坡之二處之車載光達資料，依現況運用多尺度分類法或模擬光照法濾除表面植被後，再透過三維空間平面擬合結構平面，應用Markland測試法進行分析，計算層面或構造交角是否處於危險狀態。
兩處研究區域依不同摩擦角、坡度和坡向進行計算，大約有30%機率發生楔型破壞。在本研究之中一研究區域，濾除附著植被並保留內部構造之處理方法，相較於全數剔除植被覆蓋的方式增加21%的可用資料面積。未來可結合前後期點雲資料進行比對，若是岩體產生鬆動或有構造發育之跡象產生，則提供警告給相關管理單位，期望能應用於落石預警以及週期性自動化檢查，減少因公路沿線落石而發生傷亡之情形。

The most traditional method of investigating the geo-structure is to measure the rock slope by inclinometer manually. Furthermore, there are also several systematic ways to conduct similar tasks such as scan-line method or observation window method. However, all of these operations cost intense time and human resources, it shall coped with potential of danger while measuring the data beneath an unstable slope.
The major purpose of this study is to clean out the vegetation from mobile LiDAR data, which is grow between the crack and enshroud the point cloud from the covered rock, to provide more data of the rock joints from the covered rock for further analysis. Two study sites are the rocky slopes next to highway No.8 in Taroko, eastern Taiwan. The different of surface vegetation are filtered via methods of qPCV method or CANUPO depend on the reality condition. Fitting the three-dimensional geo-structures with a digital plane objects by means of clusters concentration are carried out. Finally, the Markland test method is used to analyze the stability of the angle between geo-structures.
These two study sites are calculated with various failure angle、slope and azimuth. Around 30% of chance would cause a wedge failure in these areas. In these two study sites, the process that clean out the covered vegetation to retain the data beneath it could gain extra 21% of data than the regular means of erasing all the covered data. In the future data gathered from different time could be compared, if the existence of loosened rock or the enlargement of fracture zone is detected, an early warning to the highway authority could be issued.

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