基于不同分辨率DEM的地形因子比较分析

Comparison of Topographic Factors Based on Different Resolution of Raster DEM

地形因子的提取对水土流失、土地利用、土地资源评价、城市规划等方面的研究起着重要作用。目前地形因子的提取主要是基于DEM来完成的,而DEM的分辨率不同,所提取的地形因子的结果也不同。以化龙山为例,选择4种不同网格分辨率和地面坡度、坡向、平面曲率、剖面曲率4个地形因子作为分析因子,运用叠合比较和统计分析方法,研究地形因子随这4种分辨率DEM的变化规律。结果表明,DEM的分辨率越大,对地形的概括作用越明显,地形越趋近于平坦化。该研究是对前人研究的继续深化,通过对多因素的分析,旨在得到更加普遍的规律,为其他不同地貌的地形研究提供可借鉴的模式。

Topography determined on the reduction and redistribution of the matter and energy of the earth＇s surface. It was an important factor effected on soiland water loss. The digital elevation model（DEM） was the most important information on space in geographic databases of remote sonsing and geographic information system and core data system in three-dimensional space handling and terrain analysis. At present, the term extraction was largely based on DEM to finish,and the results of the extraction were different with different cell sizes of DEM.Taking Hualong mountain as an example, the article chose four different resolution to calculate and analyzed four terrain factors that contained slope, aspect, plan curvature and profile curvature,and studied variation trend of the four factors with the increasing of resolution value. The results showed that the DEM made terrain more generalizatiun with the increasing of resolution value. Research was to continue to deepen our previous research, revealed more general rule by way of analyzing many factors,and provided a model to other landforms of topography studies.