基于DEM的新疆地势起伏度分析

Analysis of the relief amplitude in Xinjiang based on digital elevation model

地势起伏度的提取为获取地表信息、进行地形定量化分析提供有效手段。本研究以新疆1:25万DEM数据为基础,并借鉴前人研究方法,在GIS系统的支持下,利用邻域分析方法,运用均值变点分析法对其进行了最佳统计单元的计算,最后得出基于1:25万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(2.56km2),并完成了新疆地势起伏度分级图的绘制,通过分级图认真分析新疆基本地貌特征(戈壁、沙漠、丘陵、高山等),从地势上看,新疆地势局部起伏较大,总体较平缓。

The extraction Relief Amplitude provides effective means for the access to surface information and the quantitative analysis of the terrain. On the basis of the Xinjiang 1：250 000 DEM data and previous research, with the support of the GIS system, using the neighborhood analysis, and applying mean of change-point analysis, the computation of best statistical unit is performed. Then the best statistical unit of the Xinjiang Relief Amplitude calculation based on 1：250 000 DEM is obtained, which is the 8 × 8 mesh size （2. 56km^2） . Finally the Xinjiang Relief Amplitude grade was drawn. Through the careful analysis on Xinjiang＇s geomorphologic features （Gobi, Desert, Desert, hills, mountains, etc. ） , Xinjiang local undulating terrain is larger, more gentle overall.