当前位置: X-MOL 学术Int. J. Geograph. Inform. Sci. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
An integrated method for DEM simplification with terrain structural features and smooth morphology preserved
International Journal of Geographical Information Science ( IF 5.7 ) Pub Date : 2020-05-29
Wenhao Yu, Yifan Zhang, Tinghua Ai, Zhanlong Chen

As a key focus of cartography and terrain analysis, the simplification of a digital elevation model (DEM) is used to preserve the pattern features of the terrain surface while suppressing its details over multiple scales. Statistical filtering and structural analysis methods are commonly used for this process. The structural analysis method performs well in identifying terrain structural edges, while it tends to discard the smooth morphology of a terrain surface. In addition, the filter that aims to reduce noise on a surface may over-smooth the terrain structural edges. Therefore, to preserve both the terrain structural edges and smooth morphology, we propose to combine the techniques of statistical filtering and structural analysis. Specifically, all the critical elevation points and structural edges are first detected from the DEM surface by using the structural analysis method. Then, the iterative guided normal filter is used to smooth the generalized DEM with the guidance of the structure of the original surface. After this process, the terrain structure is retained in the smooth surface of the DEM. The experimental results with a real-world dataset show that our method can inherit the merits of both structural analysis and statistical filter in preserving terrain features for multi-scale DEM representations.



中文翻译:

保留地形结构特征和平滑形态的DEM简化集成方法

作为制图学和地形分析的重点,数字高程模型(DEM)的简化用于保留地形表面的图案特征,同时在多个尺度上抑制其细节。统计过滤和结构分析方法通常用于此过程。结构分析方法在识别地形结构边缘方面表现良好,而却倾向于丢弃地形表面的平滑形态。此外,旨在减少表面噪声的滤波器可能会使地形结构边缘过平滑。因此,为了同时保留地形结构边缘和平滑形态,我们建议将统计过滤技术和结构分析技术结合起来。特别,首先使用结构分析方法从DEM表面检测所有关键高程点和结构边缘。然后,使用迭代引导法线滤波器在原始表面结构的引导下平滑广义DEM。在此过程之后,地形结构将保留在DEM的光滑表面中。真实数据集的实验结果表明,我们的方法在保留地形特征以用于多尺度DEM表示时,可以继承结构分析和统计滤波器的优点。

更新日期:2020-05-29
down
wechat
bug