地表高程剖面特征及其在起伏度分析中的应用——以平行岭谷区华蓥市为例
发布时间：2018-09-07 07:08
【摘要】：针对确定高分辨率、小区域地形起伏度最佳求算区域中存在的不确定性,提出了分析地表高程典型剖面的多尺度特征,继而探索其在确定最佳求算区域中的应用适应性的方法。利用多尺度DEM分析县域地形起伏,以川东平行岭谷区华蓥市为例,基于ASTER GDEM数据,提取高程剖面线。Morlet小波多尺度分解显示,在20~27(600~810m)及42~46(1 260~1 380m)窗口区间小波方差呈现峰值特征。为验证多尺度特征及其在确定地形起伏度最佳分析窗口中的应用,基于30m及90m分辨率的DEM运用邻域统计法求算地形起伏度。均值变点法表明地形起伏度最佳分析窗口分别为27×27(810m)、17×17(1 530m),单元面积分别为0.65km2、2.34km2,接近小波峰值区间,90mDEM求算的地形起伏度更接近于实际情况。实验表明,高程剖面分析是研究岭谷区地形多尺度起伏特征有效方法之一;其指示的特征尺度,可以与变点法确定的起伏度分析窗口相互对照。
[Abstract]:In view of the uncertainty existing in the determination of high resolution and the optimum calculation area of topographic fluctuation of small area, this paper puts forward a method to analyze the multi-scale characteristics of typical surface elevation profile, and then to explore its application adaptability in determining the optimum calculation area. Using multi-scale DEM to analyze the terrain fluctuation in the county area, taking Huaying city in the parallel ridge valley of eastern Sichuan as an example, based on the ASTER GDEM data, the elevation profile line. Morlet wavelet multiscale decomposition display is extracted. The wavelet variance of the peak value is shown in the windows of 20 / 27 (600 / 810m) and 42an46 (1 260/ 1380m) window. In order to verify the multi-scale feature and its application in determining the optimal analysis window of terrain relief, the DEM based on 30m and 90m resolution is used to calculate the topographic relief by neighborhood statistics. The mean value variation point method shows that the optimum analysis window of terrain fluctuation is 27 脳 27 (810m) / 17 脳 17 (1,530m), and the unit area is 0.65km2 / 2.34km2, respectively. The topographic fluctuation calculated by approaching the wavelet peak value interval / 90mDem is closer to the actual situation. The experimental results show that the elevation profile analysis is one of the effective methods to study the multi-scale relief characteristics of the terrain in the Linggu area, and that the characteristic scale indicated by the elevation profile can be compared with the fluctuation analysis window determined by the variable point method.
【作者单位】： 西华师范大学国土资源学院;成都信息工程学院资源环境学院;
【基金】：国家自然科学基金(41101348;41201414) 西华师范大学基本科研业务费专项资金(15C002);西华师范大学博士启动基金(12B015)
【分类号】：P208;P285.1
[Abstract]:In view of the uncertainty existing in the determination of high resolution and the optimum calculation area of topographic fluctuation of small area, this paper puts forward a method to analyze the multi-scale characteristics of typical surface elevation profile, and then to explore its application adaptability in determining the optimum calculation area. Using multi-scale DEM to analyze the terrain fluctuation in the county area, taking Huaying city in the parallel ridge valley of eastern Sichuan as an example, based on the ASTER GDEM data, the elevation profile line. Morlet wavelet multiscale decomposition display is extracted. The wavelet variance of the peak value is shown in the windows of 20 / 27 (600 / 810m) and 42an46 (1 260/ 1380m) window. In order to verify the multi-scale feature and its application in determining the optimal analysis window of terrain relief, the DEM based on 30m and 90m resolution is used to calculate the topographic relief by neighborhood statistics. The mean value variation point method shows that the optimum analysis window of terrain fluctuation is 27 脳 27 (810m) / 17 脳 17 (1,530m), and the unit area is 0.65km2 / 2.34km2, respectively. The topographic fluctuation calculated by approaching the wavelet peak value interval / 90mDem is closer to the actual situation. The experimental results show that the elevation profile analysis is one of the effective methods to study the multi-scale relief characteristics of the terrain in the Linggu area, and that the characteristic scale indicated by the elevation profile can be compared with the fluctuation analysis window determined by the variable point method.
【作者单位】： 西华师范大学国土资源学院;成都信息工程学院资源环境学院;
【基金】：国家自然科学基金(41101348;41201414) 西华师范大学基本科研业务费专项资金(15C002);西华师范大学博士启动基金(12B015)
【分类号】：P208;P285.1
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