| 黄土丘陵沟壑区1∶1万及1∶5万比例尺DEM地形信息容量对比 |
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| 引用本文： | 汤国安,陈楠,刘咏梅,张友顺,陈正江.黄土丘陵沟壑区1∶1万及1∶5万比例尺DEM地形信息容量对比[J].水土保持通报,2001,21(2):34-36. |
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| 作者姓名： | 汤国安 陈楠 刘咏梅 张友顺 陈正江 |
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| 作者单位： | 1. 中科院水利部水土保持研究所;西北大学城市与资源学系
2. 西北大学城市与资源学系, |
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| 基金项目： | 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基金(wKL99-0320)；教育部资助优秀青年教师基金；陕西省教育厅专项研究基金(00JK150) |
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| 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为校准植，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。
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| 关 键 词： | 数字地形模型 比例尺 对比 误差 地形信息容量 |
| 文章编号： | 1000-288X(2001)02-0034-03 |
| 收稿时间： | 2001/2/21 0:00:00 |
| 修稿时间： | 2001年2月21日 |
A Comparison on Digital Terrain Models of Different Scales in Loess Hill and Gully Area |
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| TANG Guo''an,CHEN Nan,LIU Yongmei,ZHANG Youshun and CHEN Zhengjiang.A Comparison on Digital Terrain Models of Different Scales in Loess Hill and Gully Area[J].Bulletin of Soil and Water Conservation,2001,21(2):34-36. |
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| Authors: | TANG Guo'an CHEN Nan LIU Yongmei ZHANG Youshun and CHEN Zhengjiang |
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| Institution: | Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling 712100, Shaanxi Province, PRC;Department of Urban and Resource Sciences, Northwest University, Xi'an 710069, PRC;Department of Urban and Resource Sciences, Northwest University, Xi'an 710069, PRC;Department of Urban and Resource Sciences, Northwest University, Xi'an 710069, PRC;Department of Urban and Resource Sciences, Northwest University, Xi'an 710069, PRC;Department of Urban and Resource Sciences, Northwest University, Xi'an 710069, PRC |
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| 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 DEMs of 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, 1:50000 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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| Keywords: | DEM map scale comparison error |
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