topic cell statistics error in Geoprocessing Questions https://community.esri.com/t5/geoprocessing-questions/cell-statistics-error/m-p/741317#M24378 <HTML><HEAD></HEAD><BODY><SPAN>Hello</SPAN><BR /><SPAN>I am trying to calculate the standard deviation of a stack of 45 raster image files. I initally tried writing a simple script using Arcpy, but the results were not what I expected (values were very large and non-sensical). My script was identical to ones I used for calculating the sum and mean of the same rasters. The scripts worked perfectly. But when I replaced "sum" or "mean" with "STD", there was a problem.</SPAN><BR /><BR /><SPAN>I decided to try to compare the output from within ArcGIS because of something I found online indicating it may be a bug with python (</SPAN><A href="http://gis.stackexchange.com/questions/8780/spatial-analyst-cell-statistics-seems-to-give-the-wrong-answer-in-arcgis-10-0">http://gis.stackexchange.com/questions/8780/spatial-analyst-cell-statistics-seems-to-give-the-wrong-answer-in-arcgis-10-0</A><SPAN>)</SPAN></BODY></HTML> Tue, 06 Aug 2013 19:32:44 GMT SThompson 2013-08-06T19:32:44Z cell statistics error https://community.esri.com/t5/geoprocessing-questions/cell-statistics-error/m-p/741317#M24378 <HTML><HEAD></HEAD><BODY><SPAN>Hello</SPAN><BR /><SPAN>I am trying to calculate the standard deviation of a stack of 45 raster image files. I initally tried writing a simple script using Arcpy, but the results were not what I expected (values were very large and non-sensical). My script was identical to ones I used for calculating the sum and mean of the same rasters. The scripts worked perfectly. But when I replaced "sum" or "mean" with "STD", there was a problem.</SPAN><BR /><BR /><SPAN>I decided to try to compare the output from within ArcGIS because of something I found online indicating it may be a bug with python (</SPAN><A href="http://gis.stackexchange.com/questions/8780/spatial-analyst-cell-statistics-seems-to-give-the-wrong-answer-in-arcgis-10-0">http://gis.stackexchange.com/questions/8780/spatial-analyst-cell-statistics-seems-to-give-the-wrong-answer-in-arcgis-10-0</A><SPAN>)</SPAN></BODY></HTML> Tue, 06 Aug 2013 19:32:44 GMT https://community.esri.com/t5/geoprocessing-questions/cell-statistics-error/m-p/741317#M24378 SThompson 2013-08-06T19:32:44Z