动态窗口邻域统计的高差计算方法

发布时间：2019-06-04 18:47

【摘要】：针对高差对于地貌类型定义、不同地貌类型范围划定以及山地灾害危险性评价的重要意义,该文将坡脚的高程定义为基准高程,提出了动态窗口邻域统计的高差计算方法。计算每个栅格到坡脚的距离,作为该栅格的对应的窗口半径;利用邻域统计的方法,搜索该窗口范围内的最低高程值,即为坡脚的高程,作为该栅格高差计算的基准高程;最终通过高程值与基准高程相减运算,获取每个栅格点对应的高差。选取四川省都江堰市虹口地区为研究区,对比两种不同的高差计算方法。结果显示:在山脊和山肩部位,动态窗口计算的高差值大于静态窗口的高差值,而位于山脚动态窗口计算的高差值小于静态窗口计算的高差值;利用动态窗口获得的高差的精度明显高于静态窗口的计算结果,其平均偏差由75.53降低为13.24。
[Abstract]:In view of the significance of height difference for the definition of geomorphological types, the delineation of different geomorphological types and the risk assessment of mountain disasters, this paper defines the elevation at the foot of the slope as the reference elevation, and puts forward a method for calculating the height difference of dynamic window neighborhood statistics. The distance from each grid to the foot of the slope is calculated as the corresponding window radius of the grid, and the lowest elevation value in the window range is searched by the method of neighborhood statistics, that is, the elevation of the foot of the slope, which is used as the reference elevation calculated by the height difference of the grid. Finally, the height difference corresponding to each grid point is obtained by subtraction between elevation value and reference elevation. Hongkou area of Dujiangyan City, Sichuan Province is selected as the study area, and two different calculation methods of height difference are compared. The results show that the height difference calculated by the dynamic window is larger than that calculated by the static window in the ridge and shoulder, while the height difference calculated by the dynamic window at the foot of the mountain is smaller than that calculated by the static window. The accuracy of the height difference obtained by dynamic window is obviously higher than that of static window, and the average deviation is reduced from 75.53 to 13.24.
【作者单位】：中国科学院山地灾害与地表过程重点实验室/水利部成都山地灾害与环境研究所;西南科技大学环境与资源学院;
【分类号】：P208

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