Bathymetry from through-water photogrammetry

河流系统研究公司(FSR)专门从事河流分析、评估和管理，包括 建立水文模型。模拟河流水流的一个关键输入参数是结构 最好用3D地形模型来量化。然而，开发河床的3D地形模型 在实际应用所需的空间范围内，使用现场数据是不可行的。摄影测量是一种 开发三维地形模型的实地数据收集的替代方法。为陆地开发良好 在应用中，浸没在水中的区域的摄影测量由于光在水下的折射而变得复杂。 气水界面这项研究项目将建立在早期发展的水上摄影测量 生成计算机代码，为河床和其他浸入水中的区域生成强大的3D地形模型， 水FSR将从WorldView-2卫星获取立体卫星图像以及深度探测 与差分GPS系统的地理参考，验证所开发的方法。尼科梅克尔河 将把不列颠哥伦比亚省的萨里作为试点，因为FSR已经在那里进行了实地采样。结果将 立即适用于FSR，以改善其Nicomekl河的水文模型，同时采用 通过水摄影测量更广泛地将改进浅水体的水深估计， 河流、湖泊和近岸地区。

Fluvial Systems Research Inc. (FSR) specializes in river analysis, assessment and management, including development of hydrological models. A key input parameter for modeling water flow in rivers is the structure of the river bed, best quantified with a 3D terrain model. However, developing 3D terrain models of river beds using field data is unfeasible at the spatial extents needed for real-world applications. Photogrammetry is an alternative to field-based data collection for development of 3D terrain models. Well developed for terrestrial applications, photogrammetry of areas immersed in water is complicated by the refraction of light at the air-water interface. This research project will build upon earlier development in through-water photogrammetry to produce computer code to produce robust 3D terrain models for river beds and other areas immersed in water. FSR will acquire stereo satellite imagery from the WorldView-2 satellite as well as depth soundings georeferenced with a differential GPS system, for validation of the developed method. The Nicomekl River in Surrey, BC, will be used as pilot site because FSR already conducts field sampling there. The results will be immediately applicable to FSR to improve its hydrological modeling for the Nicomekl River, while adoption of through-water photogrammetry more broadly will improve water depth estimates for shallow-water bodies, rivers, lakes and nearshore areas, world-wide.