Comparison between General Moran's Index and Getis-Ord General G of Spatial Autocorrelation

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.