DEM内插对数字地形因子提取的影响研究

Research on the Influence of DEM Interpolation on Digital Terrain Factor Extraction

针对DEM内插方法不同对数字地形因子提取具有不确定性这一问题,本文以山西省盂县乌河流域潘家汇段为研究区,基于航空摄影测量数据,以坡度、坡向为数字地形因子,以反距离权重插值法、克里格法和自然邻域法3种内插方法,进行了数字地形因子提取的可靠性分析实验。实验结果表明:相比较自然邻域法,反距离权重插值法和克里格法具有高度一致性;自然邻域法在不同分辨率的DEM上所提取的坡度一致性较高,而提取的坡向则分异明显。本文的实践可为数字地形因子提取和应用提供一定的参考。

Aiming at the problems that different DEM interpolation methods have uncertainties on the extraction of digital terrain factors,this paper takes Panjiahui section of the Wuhe River Basin in Yuxian,Shanxi Province as the research area,based on aerial photogrammetry data,uses slope and aspect as the digital terrain factors,and carries out reliability analysis experiments on the extraction of digital terrain factors with three interpolation methods:inverse distance weighted interpolation method,Kriging method and natural neighborhood method.The experimental results show that compared with the natural neighborhood method,the inverse distance weighted interpolation method and the Kriging method have a high degree of consistency;the slope extracted by the natural neighborhood method has a high degree of consistency on different resolution DEMs,while the extracted slope direction has obvious differentiation.The practice in this paper can provide a certain reference for the extraction and application of digital terrain factors.