Workflow: From photo-based 3-D reconstruction of remotely piloted aircraft images to a 3-D geological model
Workflow: From photo-based 3-D reconstruction of remotely piloted aircraft images to a 3-D geological model
复制标题
工作流程：从基于照片的遥控飞机图像 3D 重建到 3D 地质模型
作者：
Reuben J. Hansman;U. Ring
地质野外填图是了解地质过程的重要第一步。在20世纪，通过遥感技术的进步，测绘发生了革命性的变化。随着最近低成本遥控飞机(RPA)的问世，野外地质学家现在不需要使用卫星、直升机或飞机系统就可以例行地进行航空成像。RPA照片由基于照片的三维(3-D)重建软件处理，该软件使用运动结构和多视角立体算法来创建区域或目标露头的超高分辨率三维点云。这些点云被分析以提取地质结构和地层的方向，并被用于创建数字高程模型和照片级逼真的3-D模型。然而，这种技术直到最近才被用于结构映射。在这里，我们概述了一个工作流程，从RPA数据采集开始，然后是基于照片的3-D重建，最后是3-D地质模型。选择阿拉伯联合酋长国的Jabal Hafit背斜来演示这一工作流程。在这个背斜上，露出地面的情况很好，由于地形起伏很高，航行起来很有挑战性。这为理想的RPA测绘站点提供了一个很好的指示，并很好地表明了这种方法对野外地质学家可能有多实用。结果表明，基于RPA照片的三维重建填图是一种准确、经济的遥感地质填图方法。
Geological field mapping is a vital first step in understanding geological processes. During the 20th century, mapping was revolutionized through advances in remote sensing technology. With the recent availability of low-cost remotely piloted aircraft (RPA), field geologists now routinely carry out aerial imaging without the need to use satellite, helicopter, or airplane systems. RPA photographs are processed by photo-based three-dimensional (3-D) reconstruction software, which uses structure-from-motion and multi-view stereo algorithms to create an ultra-high-resolution, 3-D point cloud of a region or target outcrop. These point clouds are analyzed to extract the orientation of geological structures and strata, and are also used to create digital elevation models and photorealistic 3-D models. However, this technique has only recently been used for structural mapping. Here, we outline a workflow starting with RPA data acquisition, followed by photo-based 3-D reconstruction, and ending with a 3-D geological model. The Jabal Hafit anticline in the United Arab Emirates was selected to demonstrate this workflow. At this anticline, outcrop exposure is excellent and the terrain is challenging to navigate due to areas of high relief. This makes for an ideal RPA mapping site and provides a good indication of how practical this method may be for the field geologist. Results confirm that RPA photo-based 3-D reconstruction mapping is an accurate and cost-efficient remote sensing method for geological mapping.