Historical aerial photographs for landslide assessment: two case histories
Historical aerial photographs for landslide assessment: two case histories
复制标题
用于山体滑坡评估的历史航空照片：两个案例
DOI：
10.1144/1470-9236/07-011
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发表时间：
2007
影响因子：
1.4
通讯作者：
Jh Chandler
中科院分区：
文献类型：
--
作者：
J. Walstra;Neil Dixon;Jh Chandler
本文论证了历史航空照片评估长期滑坡演变的价值。研究重点是两个案例，Mam Tor和East Pentwyn滑坡。在这两个案例中，我们探索了各种数据，这些数据可以相对容易地使用普通的PC桌面、商业软件和常用的摄影材料获得。解锁照片档案中获取的定性和定量数据的技术是以航空照片判读和摄影测量学的原则为基础的。制作的产品包括地貌图、自动生成的数字高程模型、位移矢量和动画。在1953年至1999年期间，测量到的Mam Tor滑坡的水平位移范围为0.09至0.74 m a−1，这一点得到了独立调查数据的验证。此外，观察到的位移模式与照片解释的地貌信息是一致的。东彭特温滑坡的摄影测量（1971年至1973年水平位移高达6 m a−1）也显示出与独立数据惊人的相似之处。在这两个案例的历史，垂直精度是不够的，以检测显着的海拔变化。尽管如此，DEM被证明是一个强大的可视化工具。总体而言，本研究的结果验证了所使用的技术，并强烈鼓励在滑坡研究中使用历史摄影材料。
This paper demonstrates the value of historical aerial photographs for assessing long-term landslide evolution. The study focused on two case histories, the Mam Tor and East Pentwyn landslides. In both case histories we explored the variety of data that could be derived relatively easily using an ordinary PC desktop, commercially available software and commonly available photographic material. The techniques to unlock qualitative and quantitative data captured in the photographic archive were based on the principles of aerial photo-interpretation and photogrammetry. The products created comprised geomorphological maps, automatically derived digital elevation models (DEMs), displacement vectors and animations. The measured horizontal displacements of the Mam Tor landslide ranged from 0.09 to 0.74 m a−1 between 1953 and 1999, which was verified by independent survey data. Moreover, the observed displacement patterns were consistent with photo-interpreted geomorphological information. The photogrammetric measurements from the East Pentwyn landslide (horizontal displacements up to 6 m a−1 between 1971 and 1973) also showed a striking resemblance to independent data. In both case histories, the vertical accuracy was insufficient for detecting significant elevation changes. Nevertheless, DEMs proved to be a powerful tool for visualization. Overall, the results in this study validated the techniques used and strongly encourage the use of historical photographic material in landslide studies.