摘要
运用比较分析与数理统计的方法,以1:10000DEM为基准,探讨在黄土丘陵沟壑区1:50000地形图所建立的数字高程模型描述地表形态的精度特征。样区为陕北绥德县韭园沟流域,基本技术平台为ARC/VIEW地理信息系统软件,研究结果表明,在该地区内,利用1:50000DEM所提取的降水累积量、地面坡度、地面坡向3种地形因子都不同程度地存在着误差。该研究成果对于DEM应用精度的估算与误差的纠正,都有一定的指导意义。
A series of experiments ware made to investigate the accuracy of topographic variables derived from DEMs of 1: 50000 map scaled and with a 5m horizontal resolution by means of a careful comparison with 1:10000 scaled DEMs of the same area. Taking Jiuyan area, from Suide county Shanxi Province P. R. China, as a test area and ARC/VIEW 3.1 as a main working platform, the results show different errors can be found in all three topographic variables, such as slope gradient, aspect of surface and accumulation. The results of this study can be used to guide the error-rectifying and the accuracy-evaluating of the DEMs in practical applications.
出处
《测绘科学》
CSCD
2004年第3期39-41,共3页
Science of Surveying and Mapping
基金
国家自然科学基金(49971065)
测绘遥感信息工程国家重点实验室开放研究基金(WKL99-0320)
