Mean and SD in Classification Statistics V. Get Raster Properties Tool

Discussion created by paxman on Oct 12, 2011
Latest reply on Sep 19, 2013 by pl1021
I'm using Arc 9.3. I'm producing hotspot from rasters that cover all parts of the raster that are greater than 1 SD above the mean. Originally I used the Classification Statistics in Symbology> Classify to obtain the mean and SD. However this is tedious because you can't cut and paste from here and you have to look at one at a time. I discovered the Get Raster Properties tool which calculates what I needs far more easily and allows multiple rasters to be assessed at once. However the values for the mean and SD are different from the classification statistics by some way.

Why are they calculated differently?