CHEN Ji-long,WU Wei,LIU Hong-bin.Effect of DEM Interpolation on the Slope and Aspect[J].Research of Soil and Water Conservation,2008,15(06):14-17.
DEM内插算法对坡度坡向的影响
- Title:
- Effect of DEM Interpolation on the Slope and Aspect
- Keywords:
- DEM; slope degree; slope direction; terrain analysis
- 分类号:
- S157;TP79
- 摘要:
- 虽然DEM的应用越来越广泛，但是在实际研究运用中获取DEM的方式主要是利用各种矢量高程信息通过插值而来，不同的插值算法必然会影响DEM分析的结果；以南方丘陵地区为研究区域，利用样区的1∶10000的矢量地形图为数据源，通过对不同算法生成不同分辨率的DEM坡度、坡向的对比研究发现：在坡度小于30°时，不同的算法对坡度具有显著的影响，而大于30°时分辨率和算法均不会对坡度产生显著影响；研究表明：在具有大量平坦区域的地区，尽管ANUDEM算法生成的DEM总体上的精度最高，但是不会产生平坦区域，所以并不适合于这类地区的地形分析。
- Abstract:
- In many cases of the research and application,digital elevation data may be the only source for DEM generation with algorithms,which are available or affordable.It is known that the analytic result from the DEM can vary in quality depending on their algorithms.Taking hilly region in southern China as research region,using the digital contour with the scale of 1:10 000 as the source,this paper compared the slope,aspect from the DEM generated with five algorithms,the results showed that there were significant effect on the slope among the algorithms when the slope<30°,but there were no significant effect on the slope among the algorithms and resolution when the slope>30°.Furthermore,the result also showed that DEM interpolated with ANUDEM is the most precise,however,there was no flat area in the result from the terrain analysis in the region with extensive flat area,so it can’t be suitable for performing terrain in such region.
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备注/Memo
收稿日期:2008-4-18;
基金项目:重庆市科委重点攻关项目（2006AB1015）；重庆市教委科技资助项目（0182）
作者简介:陈吉龙（1983- ），男，重庆巫山人，硕士研究生，从事3S应用研究。E-mial：cjl47168@163.com
通讯作者:刘洪斌（1966- ），男，重庆梁平人，研究员，从事3S应用研究。E-mial：lqb2000@163.com