新疆地势起伏度的分析研究

Analysis of the relief amplitude in Xinjiang

在以新疆1:250000 DEM数据为基础,通过认真分析新疆基本地貌特征,在GIS系统的支持下,利用邻域分析方法,选取2×2,3×3,4×4,…,21×21,25×25,30×30等22个邻域分析窗口,运用均值变点分析法对其进行了最佳统计单元的计算,结果8×8的网格大小(2.56 km^2)可作为曲线大小的拐点,即为曲线由陡变缓的阈值.从而得出基于1:250000 DEM的新疆地势起伏度计算的最佳统计单元为8×8的网格大小(2.56 km^2),并完成了新疆地势起伏度分级图的绘制.

On the base of the Xinjiang 1:250000 DEM data,through the careful analysis of Xinjiang s geomorphologic features,with the support of the GIS system,using the neighborhood analysis,selecting 2×2,3×3,4×4,...,21×21,25×25,30×30,etc 22 numbers of neighborhood analysis window,using mean change-point analysis for their best statistical unit.The results show that the curve appeared the inflection point at the grid unit of 8×8 mesh size(2.56 km^2),which may be called'threshold'.Before the inflection point,the cure r...