| 全局空间自相关Moran指数和G系数对比研究 |
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| 引用本文： | 张松林,张昆.全局空间自相关Moran指数和G系数对比研究[J].中山大学学报(自然科学版),2007,46(4):93-97. |
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| 作者姓名： | 张松林 张昆 |
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| 作者单位： | 同济大学测量与国土信息系 上海200092(张松林)，华东师范大学地理信息科学教育部重点实验室 上海200062(张昆) |
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| 基金项目： | 国家自然科学基金;国家重点实验室基金 |
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| 摘 要： | 研究了最常用的衡量全局空间自相关的指标:全局Moran指数和全局G系数,基于模拟的空间区域,设计了一些有代表性的空间聚集方案进行计算,比较了两种指标的探测结果。得出的初步结论是:G系数探测高值聚集的能力强于低值聚集;当研究范围内同时存在高值和低值聚集时,G系数会受聚集区域规模的影响,当高值聚集区域和低值聚集区域规模相当时,G系数往往为正数,表明G系数对高值敏感;Moran指数主要受聚集区域规模的影响,随着空间聚集范围的扩展,Moran指数会明显增大。这些结论对于探测空间自相关模式时选择何种全局指标有指导意义。
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| 关 键 词： | 空间自相关 全局指标 Moran指数 G系数 |
| 文章编号： | 0529-6579（2007）04-0093-05 |
| 修稿时间： | 2006-10-23 |
Comparison between General Moran's Index and Getis-Ord General G of Spatial Autocorrelation |
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| ZHANG Song-lin,ZHANG Kun.Comparison between General Moran''''s Index and Getis-Ord General G of Spatial Autocorrelation[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,2007,46(4):93-97. |
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| Authors: | ZHANG Song-lin ZHANG Kun |
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| Institution: | 1.Key Laboratory of Geographic Information Science,East China Normal University,Shanghai 200062,Chin;2.Department of Surveying and Geomatics,Tongji University,Shanghai 200092,China |
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| Abstract: | Moran's Index and Getis-Ord general G are among the most commonly used indices for the analysis of general spatial autocorrelation.This paper compared Moran's Index and Getis-Ord General G,based on simulating computation,the results showed that:Getis-Ord general G is more sensitive to high clusters than low ones.When high and low cluster coexist at the study area,Getis-Ord general G will be affected by the scale of cluster.G will more likely to be positive to indicate high cluster when the scale of high and low cluster are equal;Moran's Index is mainly affected by the scale of clusters,it will increase when the scale is extended.These conclusions are useful in selecting general index to detect the spatial autocorrelation pattern. |
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| Keywords: | spatial autocorrelation general indices Moran's Index Getis-Ord general G |
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