地形信息对确定DEM适宜分辨率的影响
Effects of different topographic attributes on determining appropriate DEM resolution
查看参考文献26篇
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文摘
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分辨率会直接影响基于栅格数字高程模型(DEM)的数字地形分析结果,因此在实际应用中,需要选择适宜的DEM分辨率。目前采取的基本方法,基于某种地形信息定量刻画尺度效应曲线,从而确定DEM适宜分辨率,但对于采用不同地形信息时所产生的影响尚缺乏研究。本文针对该方法中通常采用的坡度、剖面曲率、水平曲率等3种地形信息,每种地形信息提取时,分别使用两种不同的常用算法,在3个不同地形特征的研究区中,逐一计算其在不同分辨率下的局部方差均值,以刻画尺度效应曲线,确定相应的DEM适宜分辨率,并进行对比分析。结果表明:①采用剖面曲率或水平曲率所得适宜分辨率结果基本相同,但采用坡度所得出的适宜分辨率结果则有明显差别,后者所得的适宜分辨率更粗;②采用不同地形信息时,越是在平缓地形为主的研究区,所得的适宜分辨率结果越相近,在复合地形特征的研究区所得到的适宜分辨率区间均明显较宽;③地形属性计算时所用的算法对适宜分辨率结果的影响不明显。 |
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其他语种文摘
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Due to the scale effect of changing resolution for grid-based digital terrain analysis, it is important to determine an appropriate resolution (or a range of appropriate resolutions) for gridded digital elevation model(DEM) in practice. The commonly-used approach to determining appropriate resolutions is based on a scale effect curve characterized by certain types of statistics (the mean of local variance is commonly used), which is calculated on the multi-resolution dataset of a specific topographic attribute derived from the gridded DEMs with a series of spatial resolutions. The resolution with the highest value of the mean of local variance is considered to be an appropriate DEM resolution. Although several topographic attributes (such as slope gradient and curvature) have been used in this approach, there are few researches on the effects of different topographic attributes on the results from this approach. In this paper, we used an experiment to compare the effects of three types of topographic attributes (i.e., slope gradient, profile curvature, and horizontal curvature) applied to determining appropriate DEM resolutions. The experiment was conducted in three study areas with different terrain conditions, i.e. Xuancheng area with low relief, Coweeta area with high relief, and Kaixian area with more complex terrain conditions. The tested topographic attributes were calculated from the DEMs with a series of spatial resolutions (i.e., 5, 10, 15, 20, 25, 30, 50, 100, 150, 200, 300 m). For each topographic attribute, two widely-used algorithms were tested. One is proposed by Wood (1996), and the other is the one implemented in Arc-GIS software. The appropriate DEM resolution for a study area had the highest value of the mean of local variance derived from each tested topographic attribute, respectively. Experimental results showed that the effects of slope gradient and curvature are different on the results of the appropriate DEM resolution, while there is little difference between the results from profile curvature and horizontal curvature. The appropriate resolutions based on slope gradient information (i.e., 15, 50, and 100 m for Xuancheng area, Kaixian area, and Coweeta area, respectively) are coarser than those based on curvature information (i.e., 5, 10~15, and 5 m for Xuancheng area, Kaixian area, and Coweeta area, respectively), while the difference between them is less for the study areas with low relief. When slope gradient information was used, the appropriate resolution results for the study area with high relief are coarser than those for the area with low relief. When curvature information was used, the appropriate resolution results for the study areas with simple terrain conditions (such as Xuancheng area with low relief, and Coweeta area with high relief) are finer than those for the study area with complex terrain conditions. The range of appropriate resolutions from each topographic attribute for the study areas with simple terrain conditions is much wider than that for the study areas with complex terrain conditions. For each specific topographic attribute there is no difference between the effects of the tested algorithms of topographic attribute on the results of appropriate resolutions. |
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来源
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地理科学进展
,2014,33(1):50-56 【核心库】
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关键词
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数字高程模型(DEM)
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数字地形分析(DTA)
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地形信息
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适宜分辨率
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尺度
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地址
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中国科学院地理科学与资源研究所, 资源与环境信息系统国家重点实验室, 北京, 100101
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1007-6301 |
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学科
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测绘学 |
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基金
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国家科技支撑计划项目
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中科院地理资源所优秀青年人才基金项目
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文献收藏号
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CSCD:5044413
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参考文献 共
26
共2页
|
|
1.
包黎莉. 地形湿度指数算法误差的定量评价.
地理科学进展,2011,30(1):57-64
|
被引
6
次
|
|
|
|
|
2.
包黎莉. DEM误差对滑坡危险性评价模型的影响.
地理科学进展,2012,31(10):1326-1333
|
被引
2
次
|
|
|
|
|
3.
李双成. 基于小波变换的NDVI与地形因子多尺度空间相关分析.
生态学报,2006,26(12):4198-4203
|
被引
34
次
|
|
|
|
|
4.
刘学军. 论DEM地形分析中的尺度问题.
地理研究,2007,26(3):433-442
|
被引
48
次
|
|
|
|
|
5.
秦承志. 栅格数字地形分析中的尺度问题研究方法.
地理研究,2014
|
被引
1
次
|
|
|
|
|
6.
宋晓猛. 基于DEM的数字流域特征提取研究进展.
地理科学进展,2013,32(1):31-40
|
被引
33
次
|
|
|
|
|
7.
汤国安. DEM及数字地形分析中尺度问题研究综述.
武汉大学学报: 信息科学版,2006,31(12):1059-1066
|
被引
51
次
|
|
|
|
|
8.
周启鸣.
数字地形分析,2006
|
被引
110
次
|
|
|
|
|
9.
Atkinson P M. Choosing an appropriate spatial resolution for remote sensing investigations.
Photogrammetric Engineering and Remote Sensing,1997,63(12):1345-1351
|
被引
29
次
|
|
|
|
|
10.
Behrens T. Multi-scale digital terrain analysis and feature selection for digital soil mapping.
Geoderma,2010,155(3):175-185
|
被引
16
次
|
|
|
|
|
11.
Burrough P A.
Principles of geographical information systems,1998
|
被引
38
次
|
|
|
|
|
12.
Deng Y. DEM resolution dependencies of terrain attributes across a landscape.
International Journal of Geographical Information Science,2007,21(1/2):187-213
|
被引
9
次
|
|
|
|
|
13.
Dragut L. Local variance for multi-scale analysis in geomorphometry.
Geomorphology,2011,130(3/4):162-172
|
被引
15
次
|
|
|
|
|
14.
Hengl T.
Geomorphometry: concepts, software, applications,2009
|
被引
4
次
|
|
|
|
|
15.
Horn B K P. Hill shading and the reflectance map.
Proceedings of IEEE,1981,69(1):14-47
|
被引
20
次
|
|
|
|
|
16.
Hutchinson M F. A locally adaptive approach to the interpolation of digital elevation models.
The Third International Conference/Workshop on Integrating GIS and Environmental Modeling,1996
|
被引
1
次
|
|
|
|
|
17.
Liu H H. Effects of DEM horizontal resolution and methods on calculating the slope length factor in gently rolling landscapes.
CATENA,2011,87(3):368-375
|
被引
3
次
|
|
|
|
|
18.
Schmidt J. Multi-scale landform characterization.
Area,2005,37(3):341-350
|
被引
6
次
|
|
|
|
|
19.
Shary P A. Fundamental quantitative methods of land surface analysis.
Geoderma,2002,107(1):1-32
|
被引
38
次
|
|
|
|
|
20.
Smith M P. The effects of DEM resolution and neighborhood size on digital soil survey.
Geoderma,2006,137(1):58-69
|
被引
21
次
|
|
|
|
|
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