基于GPS不同测量间距的DEM地形信息提取沟蚀参数对比
何福红; 李勇; 张晴雯; 李璐; 孙丽芳; 白玲玉
刊名水土保持学报
2006
卷号20期号:5页码:116-120
关键词GPS DEM 地形信息 沟蚀
ISSN号1009-2242
其他题名Comparison of Topographic-Related Parameters Through Different GPS-Survey Scales in Gully Catchmnent of Upper Yangtze River Basin
英文摘要GPS技术正在成为一种快速高效研究沟蚀发生演变的手段.但由于GPS测量间距的影响,从建立的不同尺度DEM上获取的地形信息存在很大的不确定性,影响沟蚀研究的准确性.本文以长江上游西昌地区马家松坡小流域作为试验样区,利用RTK-GPS技术,按测量间距3,5,10m和20m等4种空间尺度对小流域的地形进行测量,基于ArcGIS8.2地理信息系统软件,建立相关尺度的栅格DEM,提取地面坡度、剖面曲率以及沟壑密度等地形信息.研究结果表明,随着测量间距的增加,从DEM上提取地面平均坡度、平均剖面曲率和沟壑密度均呈显著线性递减趋势,5m的测量间距是长江上游地区描述地形的理想尺度,可以满足研究冲沟和切沟的需要,而3m及3m以下的测量间距适用于细沟、浅沟的研究需要.我们的研究结果对应用GPS技术,实现高精度快速确定地表沟蚀过程方面具有重要意义.; GPS-survey technology is becoming an effective tool for determining topographic-related parameters. We hypothesized that the topographic-related parameters extracted from different scales of GPS survey are uncertain and the uncertainty will be especially large with respect to gully-related parameters. Four GPS-survey scales of 3, 5, 10, and 20-meter grid were conducted in Majiasongpo gully catchment located in Xichang area, SW-Chi-na. Topographic parameters including slope gradient, profile curvature, and gully system were derived from grid DEMs established using ArcGIS 8.2 software. The results indicated that the average slope gradient and average profile curvature and gully density significantly decreased with the increase of GPS-survey grid, suggesting a lower value of gully-related parameters with big GPS-survey grid than with small GPS-survey grid. A GPS-survey scale of 5 m grid is suitable for establishing DEMs in quantifying gully-related parameters whereas a 3 or less than 3m GPS-survey scale can meet with study needs of rills and shallow gullies in the upper Yangtze River basin.
学科主题测绘学 ; 农业基础科学
语种中文
内容类型期刊论文
源URL[http://111.203.20.206/handle/2HMLN22E/17454]  
专题农业环境与可持续发展研究所_环境修复研究室
作者单位中国农业科学院,农业环境与可持续发展研究所, 北京, 100081
推荐引用方式
GB/T 7714
何福红,李勇,张晴雯,等. 基于GPS不同测量间距的DEM地形信息提取沟蚀参数对比[J]. 水土保持学报,2006,20(5):116-120.
APA 何福红,李勇,张晴雯,李璐,孙丽芳,&白玲玉.(2006).基于GPS不同测量间距的DEM地形信息提取沟蚀参数对比.水土保持学报,20(5),116-120.
MLA 何福红,et al."基于GPS不同测量间距的DEM地形信息提取沟蚀参数对比".水土保持学报 20.5(2006):116-120.
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