不同空间尺度DEM地形信息容量综合对比研究

The Comprehensive and Comparative Study of Topographic Information Capacity in Different Spatial Scale's DEM

DEM包含了大量地形信息,是进行地形分析的基本数据。由于DEM数据的多尺度因素,加之地形、地貌特征具有宏观性与区域分异性的特点,不同尺度下的DEM地形信息容量具有较大的差异。本研究选取黄土高原地区的绥德、佳县、富县和宜君县四个实验样区,以Arc view/GIS软件为技术平台,提取了基于DEM数据的地形因子,并运用比较分析与数理统计的方法,对地形因子的提取结果进行了分析,获取了单一值因子的量化表达模型,确定了DEM地形信息容量与分辨率、地域及比例尺之间的量化相关关系,并在此基础上分析了DEM地形信息容量在不同空间尺度上的分异规律。

DEM contains a great deal of topographic information,which is the basic data for terrain analysis.Besides of the multi-scale factors of DEM data,topography and landscape have characteristics of macro and sub-regional features of opposite sex.DEM topographic information capacity with different scales is relatively different.In this paper,on the base of Arc view / GIS,we selected Suide,Jiaxian,Fuxian and Yijun County of Loess Plateau as the experimental plots,extracted terrain data factors found on DEM,and analyzed these extractions with methods of comparative analysis and mathematical Statistics.And than we captured the model of quantified expression of a single factor and determined the quantitative correlation of DEM terrain information capacity,resolution,zone and scales.What＇s more,we analyzed the law of differentiation of DEM topographic information capacity in distinct spatial scales on these bases.