在没有精确参考信息的情况下,基于导航仪的数字高程模型上的相对高度不准确

Q2 Agricultural and Biological Sciences Geography, Environment, Sustainability Pub Date : 2024-07-05 DOI:10.24057/2071-9388-2024-3123
Victoria V. Zorina, Andrey L. Entin
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引用次数: 0

摘要

无人飞行器(UAV)获取的图像被广泛用于地表建模。最新研究证明,利用无人飞行器图像创建的数字高程模型(DEM)具有高精确度和高可靠性的特点。这些研究大多侧重于评估无人机 DEM 的绝对高程精度,但也应考虑相对高程的精度(即再现 DEM 内部局部高程差异的精度)。在本文中,我们将重点关注在没有精确坐标参考的情况下,通过无人机拍摄的图像得出的 DEM 中复制相对高程的精度。为了评估这一精度,我们使用了两种不同方法处理的航空图像数据集:一种是通过 GNSS 接收机获得的机载坐标,另一种是基于后处理运动学(PPK)方法计算的精确坐标。所选的评估地点在地形和森林植被特征方面互不相似,以跟踪不同地区建模的差异。通过差异场统计指数,将构建的 DEM 与全球 DEM 参考片段进行比较。研究结果表明,缺乏精确的坐标参考并不会对 DEM 中再现相对高度的精度产生实质性影响。因此,在大多数地理研究中,可以使用没有精确坐标参考的无人机材料进行建模,地形陡度值的误差在 0.9°以内都是可以接受的。
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Inaccuracy of relative elevations on uavbased digital elevation models without precise reference information
Imagery obtained from unmanned aerial vehicle (UAV) is widely used for land surface modelling. Recent research prove that digital elevation models (DEMs) created from UAV imagery are characterized by a high rate of accuracy and reliability. Most of these studies are focused on assessing absolute elevation accuracy of the UAV DEMs, but the accuracy of relative elevations (i.e., accuracy of reproducing of local elevation differences within DEM) also should be considered. In this paper, we focus on the precision of replicating relative elevations in DEMs derived from imagery captured via UAVs without precise coordinate reference. To evaluate this accuracy, we use datasets of aerial images processed in two different methods: one with on-board coordinates obtained from a GNSS receiver, and the other based on precise coordinates calculated with the Post-Processing Kinematic (PPK) method. The sites selected for assessment are not look like each other in terms of terrain and forest cover characteristics to track the difference of modelling in the divergent areas. Constructed DEMs were compared with reference fragments of global DEMs by the statistical indices for the difference fields. The findings indicate that the absence of an accurate coordinate reference does not have a substantial impact on the precision of reproducing relative elevations in the DEM. This makes it possible to use UAV materials without precise coordinate reference for modelling in most geographical studies, where the error of terrain steepness values of 0.9° can be considered acceptable.
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来源期刊
Geography, Environment, Sustainability
Geography, Environment, Sustainability Social Sciences-Geography, Planning and Development
CiteScore
2.50
自引率
0.00%
发文量
37
审稿时长
12 weeks
期刊介绍: Journal “GEOGRAPHY, ENVIRONMENT, SUSTAINABILITY” is founded by the Faculty of Geography of Lomonosov Moscow State University, The Russian Geographical Society and by the Institute of Geography of RAS. It is the official journal of Russian Geographical Society, and a fully open access journal. Journal “GEOGRAPHY, ENVIRONMENT, SUSTAINABILITY” publishes original, innovative, interdisciplinary and timely research letter articles and concise reviews on studies of the Earth and its environment scientific field. This goal covers a broad spectrum of scientific research areas (physical-, social-, economic-, cultural geography, environmental sciences and sustainable development) and also considers contemporary and widely used research methods, such as geoinformatics, cartography, remote sensing (including from space), geophysics, geochemistry, etc. “GEOGRAPHY, ENVIRONMENT, SUSTAINABILITY” is the only original English-language journal in the field of geography and environmental sciences published in Russia. It is supposed to be an outlet from the Russian-speaking countries to Europe and an inlet from Europe to the Russian-speaking countries regarding environmental and Earth sciences, geography and sustainability. The main sections of the journal are the theory of geography and ecology, the theory of sustainable development, use of natural resources, natural resources assessment, global and regional changes of environment and climate, social-economical geography, ecological regional planning, sustainable regional development, applied aspects of geography and ecology, geoinformatics and ecological cartography, ecological problems of oil and gas sector, nature conservations, health and environment, and education for sustainable development. Articles are freely available to both subscribers and the wider public with permitted reuse.
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