I need come clarification regarding the Local Spatial Statistics tools(Getis-Ord G, Gearys C and Moran's I) From the literature ENVI cited(And from other sources) I found that "Moran’s I varies from -1 (negative autocorrelation) to 1 (positive autocorrelation). Geary’s c ranges from 0 (Positive Autpcorrelation) 1 (no auto correlation) and 2 (negative spatial autocorrelation)." However ENVI 4.5 is not obeying this rule, when I ran these methods on a raster file I have the following values Gearys's C " min:0.0155 and max:187.3784" Moran's I " min: -12.52 and max:201.62" Would you be able to provide some help on "Why this is happening" ? Thanks Naveen Anne