動態(tài)窗口鄰域統(tǒng)計的高差計算方法
發(fā)布時間：2019-06-04 18:47
【摘要】：針對高差對于地貌類型定義、不同地貌類型范圍劃定以及山地災害危險性評價的重要意義,該文將坡腳的高程定義為基準高程,提出了動態(tài)窗口鄰域統(tǒng)計的高差計算方法。計算每個柵格到坡腳的距離,作為該柵格的對應的窗口半徑;利用鄰域統(tǒng)計的方法,搜索該窗口范圍內(nèi)的最低高程值,即為坡腳的高程,作為該柵格高差計算的基準高程;最終通過高程值與基準高程相減運算,獲取每個柵格點對應的高差。選取四川省都江堰市虹口地區(qū)為研究區(qū),對比兩種不同的高差計算方法。結(jié)果顯示:在山脊和山肩部位,動態(tài)窗口計算的高差值大于靜態(tài)窗口的高差值,而位于山腳動態(tài)窗口計算的高差值小于靜態(tài)窗口計算的高差值;利用動態(tài)窗口獲得的高差的精度明顯高于靜態(tài)窗口的計算結(jié)果,其平均偏差由75.53降低為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.
【作者單位】： 中國科學院山地災害與地表過程重點實驗室/水利部成都山地災害與環(huán)境研究所;西南科技大學環(huán)境與資源學院;
【分類號】：P208
本文編號：2492923
[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.
【作者單位】： 中國科學院山地災害與地表過程重點實驗室/水利部成都山地災害與環(huán)境研究所;西南科技大學環(huán)境與資源學院;
【分類號】：P208
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1 孫媛媛;葉文;毛居泉;;GIS技術在移動通信網(wǎng)絡優(yōu)化中的應用[A];2007北京地區(qū)高校研究生學術交流會通信與信息技術會議論文集（上冊）[C];2008年
，本文編號：2492923
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