應用攝影測量量測山坡地崩塌量之研究─苗栗火炎山為例

Measurement of Landslide Using Close-Range Photogrammetry: Case-Study at Huoyen Shan, Miao-Li

黃偉哲(Wei-Cher Huang) ； 柳文成(Wen-Cheng Liu)

《農業工程學報》 57卷4期 (2011/12) Pp. 1-13

https://doi.org/10.29974/JTAE.201112.0001

摘要

攝影測量常用的方法有非線性方程式的共線式與線性方程式的直接線性轉換（Direct Linear Transformation，DLT）法，DLT法由共線式改寫而成，是為了讓內方位參數未知或不穩定的非量度性攝影機也可應用於攝影測量上。然隨著相機功能越來越精密的情況下，DLT法已較少被使用。然而共線式需提供可靠的內、外方位參數的初始值，才能順利的完成解算，且需要花費較多的計算時間。因此在無法取得可靠的內、外方位參數的初始值的情況下，則必須使用DLT法來進行解算。本研究以攝影測量使用DLT法於苗栗火炎山先量測山坡地的地形，並與e-GPS的量測結果進行比較，探討攝影測量使用DLT法的實用性。再於崩塌區域，同樣使用DLT法量測崩塌前與崩塌後的地形，建立數值地形模型，透過數值地形模型計算土石崩塌量之體積。研究結果顯示，攝影測量使用DLT法的量測結果與e-GPS量測結果的數值地形模型。兩者表面積相差1.7%。崩塌區域在崩塌前與崩塌後的土石崩塌量體積為994.16m^3。

關鍵字

DLT法 ； 攝影測量 ； 崩塌地 ； 影像匹配 ； 火炎山 ； 苗栗

並列摘要

Most studies used the non-linear equation collinearity and linear equation Direct Linear Transformation (DLT) method in photogrammetry. Traditionally, the DLT method applied in photogrammetry was developed through collinearity for non-metric camera that interior orientation parameters were unknown or unstable. The DLT method seems not to be adopted because the function of camera is better than before. However, it is necessary to provide the precise initial value of interior and exterior orientation parameters to approach and to spend more computational cost when collinearity method is applied. As the initial value of interior and exterior orientation parameters can not be obtained, DLT method should be used.The present study adopted the DLT method in photogrammetry to measure terrain of landslide at the Huoyen Shan, Miao-Li and to compare measured results with e-GPS. The availability of photogrammetry with DLT method was also discussed. We applied the same methodology to measure the terrain before landslide and after landslide in the study area. The digital terrain model (DTM) was established and then was used to calculate the volume of the terrain before landslide and after landslide. The results revealed that the difference in surface area was approximately 1.7% as comparing the photogrammetry with DLT method and e-GPS measurement. The volume before and after landslides was 994. 16 m^3.

並列關鍵字

Direct Linear Transformation (DLT)method ； photogrammetry ； landslide ； image matching ； Huoyen Shan ； Miao-Li