Three-dimensional spatial correlation

Three-dimensional spatial correlation
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三维空间相关性

DOI:
10.1007/s12076-013-0095-6
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发表时间:
2013
期刊:
Lettes in Spatial Resource Sciellces
影响因子:
--
通讯作者:
et al.
et al.
中科院分区:
--
文献类型:
--
作者:
Takahashi T;Sato T;Aizaki H;Guo N;Nakasima Y;et al.

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从事灌溉农业的农民会受到邻居用水运营决策产生的外部性影响。由于水流的性质,这些外部性在上游-下游关系中的邻居之间比在水平邻近关系中更为明显。为了将灌溉农业的这一特点纳入空间分析,本文提出了一种用于空间回归的空间权重矩阵的新规范,其中考虑了每个观测值在整个样本中的垂直位置。所提出的概念被应用于使用作者来自中国西南部的原始遥感数据进行土地利用回归,具有四种不同的矩阵形式:对称连续、基于对称距离、不对称连续和基于不对称距离。结果表明,包含垂直空间相关性可以潜在地增强模型的解释力,特别是在适当指定连接水平相关性和垂直相关性的权重时。在本例中,垂直相关性的重要性大约是水平相关性的十分之一。
Farmers engaging in irrigated agriculture are subject to externalities stemming from their neighbours’ operational decisions on water use. Because of the nature of water flow, these externalities are more evident between neighbours in an upstream–downstream relationship rather than in horizontal proximity. In order to accommodate this characteristic of irrigated agriculture into the spatial analysis, this paper proposes a novel specification of the spatial weight matrix for spatial regressions, in which each observation’s vertical location within the whole sample is taken into account. The proposed concept is applied to a land use regression using the authors’ original remote sensing data from southwestern China, with four different matrix formations: symmetric contiguous, symmetric distance-based, asymmetric contiguous, and asymmetric distance-based. The results show that inclusion of vertical spatial correlation can potentially enhance the explanatory power of the model, especially when the weight linking horizontal correlation and vertical correlation is appropriately specified. In the present case, the importance of vertical correlation is shown to be approximately one-tenth of horizontal correlation.
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