An experiment using a circular neighborhood to calculate slope gradient from a DEM

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	An experiment using a circular neighborhood to calculate slope gradient from a DEM
	Pei Tao; Li Baolin; Qin Chengzhi
	2007
关键词	Photoelectric cells Slope stability Spatial variables measurement
英文摘要	The traditional 3 × 3 cell neighborhood used in a focal operation on a raster layer has a square shape that results in a dimensional neighborhood of which the orientation is eventually arbitrary to the physical features represented. This paper presents an experiment using a circular neighborhood to calculate slope gradient. Comparisons of the results from a circular neighborhood with the results from some traditional methods show that (a) for a smooth surface, the result from a circular neighborhood is more accurate than that from a square neighborhood, (b) a circular neighborhood is generally more sensitive to noise in the input DEM than a square neighborhood, and (c) in a validation using field measurements, the circular neighborhood performs better than the square neighborhood when the ratio of user-specified neighborhood size to cell size is high. © 2007 American Society for Photogrammetry and Remote Sensing.
出处	Photogrammetric Engineering and Remote Sensing
卷	73 期:2 页:143-154
收录类别	EI
语种	英语
内容类型	EI期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/24619]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Pei Tao,Li Baolin,Qin Chengzhi. An experiment using a circular neighborhood to calculate slope gradient from a DEM. 2007.