Mingwei Zhao, Xiaoxiao Ju, Na Zhao, Chun Wang, Yan Xu, Xiaoran Wu, Weitao Li
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引用次数: 0
摘要
通过将 DEM 的高程信息和从 DEM 提取的山谷线与不同的流量累积阈值相结合,提出了一种基于高精度地表建模(HASM)的新型数字高程模型(DEM)放大方法。与传统的 DEM 放大方法相比,所提出的方法有几个优点。首先,HASM 确保了提升后的 DEM 的平滑性。其次,通过纳入不同流量累积阈值的谷线,可以使用相同的 DEM 网格尺寸获得多个具有不同地形细节的 DEM。以中国黄土高原的九黄沟流域为例进行研究。我们使用从当地测绘部门获得的网格尺寸为 5 米的 DEM 来验证所提出的 DEM 放大方法。我们建立了地表复杂性指数来描述地形表面的复杂性,并量化了不同放大结果所得到的地形特征的差异。结果表明,随着网格大小和流量累积阈值的增加,地形变得更加概括。在较大的 DEM 网格尺寸下,流量累积阈值的增加会加大不同网格中高程值的差异,从而增加地表复杂性指数。本研究提供了一种适合量化地形的新 DEM 放大方法。
A DEM upscaling method with integrating valley lines based on HASM
A new digital elevation model (DEM) upscaling method based on high accuracy surface modeling (HASM) is proposed by combining the elevation information of DEM and the valley lines extracted from DEM with different flow accumulation thresholds. The proposed method has several advantages over traditional DEM upscaling methods. First, the HASM ensures the smoothness of the upscaled DEM. Secondly, several DEMs with different topographic details can be obtained using the same DEM grid size by incorporating the valley lines with different flow accumulation thresholds. The Jiuyuangou watershed in China’s Loess Plateau was used as a case study. A DEM with a grid size of 5 m obtained from the local surveying and mapping department was used to verify the proposed DEM upscaling method. We established the surface complexity index to describe the complexity of the topographic surface and quantified the differences in the topographic features obtained from different upscaling results. The results show that topography becomes more generalized as grid size and flow accumulation threshold increase. At a large DEM grid size, an increase in the flow accumulation threshold increases the difference in elevation values in different grids, increasing the surface complexity index. This study provides a new DEM upscaling method suitable for quantifying topography.
期刊介绍:
Frontiers of Earth Science publishes original, peer-reviewed, theoretical and experimental frontier research papers as well as significant review articles of more general interest to earth scientists. The journal features articles dealing with observations, patterns, processes, and modeling of both innerspheres (including deep crust, mantle, and core) and outerspheres (including atmosphere, hydrosphere, and biosphere) of the earth. Its aim is to promote communication and share knowledge among the international earth science communities