Spatial autocorrelation refers to the correlation of the same variable in different space position, to measure the cluster degree of spatial unit property value (Huang et al., 2014; Li et al., 2014; Zhao et al., 2014).Moran's I is a commonly used indicator of spatial auto-association. Global Moran's I is used to study the overall spatial autocorrelation, while the Local Indicators of Spatial Association (LISA) measures the degree of spatial autocorrelation in each specific location by using local Moran's I. The latter is also useful to identify local spatial cluster patterns and spatial outliers. Local Moran's I index can be expressed as