Structure-from-Motion-Derived Digital Surface Models from Historical Aerial Photographs: A New 3D Application for Coastal Dune Monitoring
Structure-from-Motion-Derived Digital Surface Models from Historical Aerial Photographs: A New 3D Application for Coastal Dune Monitoring
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DOI：
10.3390/rs13010095
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发表时间：
2021-01-01
期刊：
影响因子：
5
通讯作者：
Cooper, J. Andrew G.
中科院分区：
文献类型：
--
作者：
Grottoli, Edoardo;Biausque, Melanie;Cooper, J. Andrew G.
最近在运动结构（SfM）技术方面的进展使得无人驾驶飞行器（uav）在监测沿海地形变化方面的应用激增，特别是在根据历史航空照片重建3D表面模型时。在这里，我们使用商业软件Agisoft Metashape Pro探索了一些深度图滤波和点云清洗方法，以确定构建可靠数字表面模型（dsm）的最佳方法。12种不同的航空摄影衍生的DSMs被验证，并与光探测和测距（LiDAR）和无人机衍生的DSMs进行了比较，该系统经历了几十年的海岸线退缩。不同研究方法的平均垂直误差（均方根误差，RMSE）约为1 m，最佳方法的误差值为0.93 m。在我们的例子中，最好的方法是从密集点云（DPC）中去除0-3范围内的置信值，而不对深度图应用过滤器。所研究的方法之间的差异与沙丘滑面重建有关。将现代SfM方法应用于分析历史航空（垂直）摄影是一种新颖（且可靠）的新方法，可用于更好地量化海岸沙丘体积变化。因此，从合适的历史航空照片中提取的dsm代表了可靠的3D数据来源，可以用来更好地分析经历退缩的沿海沙丘地区的长期地貌变化。
Recent advances in structure-from-motion (SfM) techniques have proliferated the use of unmanned aerial vehicles (UAVs) in the monitoring of coastal landform changes, particularly when applied in the reconstruction of 3D surface models from historical aerial photographs. Here, we explore a number of depth map filtering and point cloud cleaning methods using the commercial software Agisoft Metashape Pro to determine the optimal methodology to build reliable digital surface models (DSMs). Twelve different aerial photography-derived DSMs are validated and compared against light detection and ranging (LiDAR)- and UAV-derived DSMs of a vegetated coastal dune system that has undergone several decades of coastline retreat. The different studied methods showed an average vertical error (root mean square error, RMSE) of approximately 1 m, with the best method resulting in an error value of 0.93 m. In our case, the best method resulted from the removal of confidence values in the range of 0-3 from the dense point cloud (DPC), with no filter applied to the depth maps. Differences among the methods examined were associated with the reconstruction of the dune slipface. The application of the modern SfM methodology to the analysis of historical aerial (vertical) photography is a novel (and reliable) new approach that can be used to better quantify coastal dune volume changes. DSMs derived from suitable historical aerial photographs, therefore, represent dependable sources of 3D data that can be used to better analyse long-term geomorphic changes in coastal dune areas that have undergone retreat.