Measurement of Topography and Landslide Using Close-range Photogrametry：Case Study at Huoyen Shan, Miao-Li
| Autor: | Wei-Cher Huang, 黃偉哲 |
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| Rok vydání: | 2010 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 98 Recently the photogrammetry has been widely applied in various fields. They are divided into the space photogrammetry, aerial photogrammetry, terrestrial photogrammetry, and close-range photogrammetry. The common uses of mathematical solution method include collinearity and direct linear transformation (DLT) method. Abdel-Aziz (1971) modified collinearity algorithm to develop DLT method which has some differences with collinearity. The present study, using close-range photogrammetry and aerial photogrammetry with the simulated experiments are adopted to compare the differences using the collinearity and DLT method. The influences on the solution results were investigated to test several scenarios which include the number of ground control points, the distribution of ground control points, the accuracy of ground control points, the accuracy of image point observation, the base-length variation, and the ground control points altitude variation. This study uses the DLT method with close-range photogrammetry to measure the terrain of landslide and to establish digital terrain model (DTM). Comparing the photogrammetry DTM and e-GPS DTM, the results revealed that they have approximately 1.7% difference in surface area. The DLT method with close-range photogrammetry was also applied to measure the terrain before landslide and after landslide in the study site and to calculate the volume before and after landslides. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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