A Comparison on Digital Terrain Models of Different Scales in Loess Hill and Gully Area

TANG Guoan; CHEN Nan; LIU Yongmei; ZHANG Youshun; CHEN Zhengjiang

doi:11894/1005-829x.2001.21(2).34

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A Comparison on Digital Terrain Models of Different Scales in Loess Hill and Gully Area

- A Comparison on Digital Terrain Models of Different Scales in Loess Hill and Gully Area
- Bulletin of Soiland Water Conservation Vol. 20, Issue 2, Pages: 34-36(2001)
- 作者机构：
  
  1. 中科院水利部水土保持研究所, 陕西杨凌,712100
  2. 西北大学城市与资源学系,陕西,西安,710069
- 作者简介：
- 基金信息：
- DOI：11894/1005-829x.2001.21(2).34
  CLC：
- Published：2001
- 稿件说明：
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TANG Guoan, CHEN Nan, LIU Yongmei, et al. A Comparison on Digital Terrain Models of Different Scales in Loess Hill and Gully Area[J]. Bulletin of Soiland Water Conservation, 2001, 20(2): 34-36.
DOI：

TANG Guoan, CHEN Nan, LIU Yongmei, et al. A Comparison on Digital Terrain Models of Different Scales in Loess Hill and Gully Area[J]. Bulletin of Soiland Water Conservation, 2001, 20(2): 34-36. DOI： 11894/1005-829x.2001.21(2).34.

摘要

黄土丘陵沟壑区地形变化异常复杂，1∶5万地形图对原始 1∶1万地形图等高线形态综合、取舍程度很大，这些都在不同程度上影响了地形分析结果的准确性。以高精度的 1∶1万比例尺DEM为校准值，运用 1∶1万及 1∶5万比例尺DEM叠合比较分析的方法，研究 1∶5万DEM的地形信息容量及提取不同地形要素的精度。试验结果表明，在黄土丘陵区，与 1∶1万DEM相比，1∶5万DEM在所提取的地面坡度、地面曲率、沟壑量等地形定量指标方面均都存在着较大的误差。

Abstract

Taking Jiuyuan valley in the loess hill and gully area as a test site

the accuracy of terrain variables derived from 1∶50000 scaled DEMs by means of a careful comparison with high accuracy DEMsof 1∶10000 scaled is probed into. The experiment shows a big error between the terrain variables(i. e. slope gradient

surface curvature

channel networks etc. derived from the both information sources. At present

1∶50 000 scaled DEM has been set up in the whole country

which will be applied as an important base for soil erosion investigation as well as soil and water conservation project planning in the loess plateau region.

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Related Author

LIU Yong-mei

TANG Guo-an

Related Institution

Department of Urban and Resource Sciences, Northwest University

Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling

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