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测绘学报  2014 

DEM插值参数优选的试验研究

, PP. 178-192

Keywords: 插值参数,搜索方式,核函数,交叉验证法,相关分析,趋势面分析,方差分析

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Abstract:

插值参数是构成插值算法的基本元素,不同的插值参数产生不同的插值精度,甚至存在巨大差异。但是对于普通用户来说,选择合适的插值参数是困难的,最终导致插值参数选择的随意性。在插值算法相关内容的研究中,使用不合适的插值算法或插值参数可能存在潜在的严重后果,甚至得到完全相反的实验结论。因此,本文根据插值算法最优权重确定方法的差异,选取反距离加权插值算法、径向基函数插值算法和普通克里格插值算法的相关插值参数,进行插值参数的“优选”研究。首先根据插值参数对插值精度的不同影响,选择相关插值参数作为实验研究对象;然后选择六种不同地貌类型地区的稀疏分布的离散采样数据作为实验数据源,运用交叉验证法、相关分析、趋势面分析和方差分析等一系列实验方法,系统研究并给出实验插值参数的“最优”取值区间,消除插值参数选择的随意性,更好地指导DEM建模的运用。

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