Online Field Trip Applications of the Web Platform for Real-scene 3D Digital Outcrops
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摘要: 露头是地质考察的重点, 结合无人机倾斜摄影测量技术构建数字露头实景三维模型并实现露头可视化研究能够为解决传统地质研究中存在的效率低、危险性高和数据复用性差等问题提供全新的思路。论文研究了倾斜影像三维建模、数字露头三维可视化和全景影像可视化等三维技术, 并基于Cesium开源三维地球引擎研发了数字露头实景三维Web平台。平台实现了高精度露头实景三维模型的可视化, 并将露头相关的描述、图片、视频、全景、文献、观察点、地质标绘等信息与露头三维模型有效结合, 实现了露头三维模型上传与实景漫游、露头相关地质信息自主提供、分享、互动与可视化展示。论文通过实例证明了平台云端地质考察应用的有效性和新颖性。该平台作为第21届国际沉积学大会虚拟野外地质路线考察的首选, 已成功应用于15条路线中的12条。相比传统地质研究手段, 露头云端三维可视化研究能够帮助地质学者更加全面、直观地理解露头地质现象的时空展布和地质特征, 并且支持数字环境下露头资源的共建、共享, 节省了地质考察的时间和成本。Abstract: Geological research has focused on outcrops.Oblique photogrammetric technology, with the aid of unmanned aerial vehicles, can build 3D digital outcrop models and further help achieve visualization research of outcrops, providing new ideas for solving the problems of low efficiency, high risk, and poor data reusability that exist in traditional geological research methods.This study investigates the key technologies of 3D modeling of oblique images, 3D visualization of digital outcrops, visualization of panoramic models, and the design and implementation of a web platform for real-scene 3D digital outcrops based on the Cesium open-source 3D earth engine.The platform facilitates the visualization of high-precision 3D models of outcrops and combines outcrop-related information such as text, pictures, videos, panoramas, documents, observation stops, and geological plotting with 3D outcrop models, implementing upload and roaming of 3D models of outcrops, and self-supply, sharing, interaction, and visualization of outcrop-related information.Moreover, the applicability and novelty of the platform for online geological field trips are demonstrated through experiments.As the first choice for virtual field trips at the 21st International Congress of Sedimentology, the platform has been successfully applied to 12 of the 15 routes.Compared with traditional geological research methods, the visualization of 3D outcrops enables geologists to acquire a more comprehensive and intuitive understanding of the spatial and temporal distribution of geological phenomena as well as the features of outcrops.This platform also enables the co-construction and dissemination of outcrop resources in a digital environment, saving the time and economic costs associated with geological expeditions.
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