格网DEM坡度计算模型的相似性研究Similarity assessment on slope models used in grid-based DEM
晋蓓,刘学军,王彦芳
摘要(Abstract)：
当DEM的精度和分辨率确定后,坡度坡向计算结果取决于计算模型。本文设计了逐栅格单元的相对差等级评价方法,并结合基于整体的频率图和XY散点图评价指标,定量揭示了坡度计算模型之间的异同。主要结论为:①坡度计算模型有离散和连续之分,连续型模型能给出更加符合实际的坡度坡向计算结果;②坡度计算结果与计算点数有关,点数越多,计算结果越稳定;③算法间的差异随DEM分辨率的增大而增大。最后本文给出了实际应用中的坡度计算模型。
关键词(KeyWords)： 数字高程模型;坡度;坡向;算法;相似性
基金项目(Foundation): 国家自然科学基金资助项目(40571120)
作者(Author): 晋蓓,刘学军,王彦芳
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