Cell Statistics (Spatial Analyst)
Summary
Calculates a percell statistic from multiple rasters.
The available statistics are Majority, Maximum, Mean, Median, Minimum, Minority, Range, Standard Deviation, Sum, and Variety.
Illustration
Usage
The order of the input rasters is irrelevant for this tool.

For statistic types Maximum, Minimum, Mean, Median, Majority, Minority and Sum, if a single raster is used as the input, the output cell values will be the same as the input cell values. For Range and STD the output cell values will all be 0, and for Variety, all 1.
Syntax
Parameter  Explanation  Data Type 
in_rasters_or_constants [in_raster_or_constant,...] 
A list of input rasters for which a statistic will be calculated for each cell within the Analysis window. A number can be used as an input; however, the cell size and extent must first be set in the environment.  Raster Layer  Constant 
statistics_type (Optional) 
Statistic type to be calculated.
 String 
ignore_nodata (Optional) 
Denotes whether NoData values are ignored by the statistic calculation.
 Boolean 
Return Value
Name  Explanation  Data Type 
out_raster 
The output raster. The value is determined by applying the specified statistic type to the input rasters.  Raster 
Code Sample
This example calculates the standard deviation per cell on several input GRID rasters and outputs the result as an IMG raster.
import arcpy from arcpy import env from arcpy.sa import * env.workspace = "C:/sapyexamples/data" outCellStats = CellStatistics(["degs", "negs", "cost"], "STD", "DATA") outCellStats.save("C:/sapyexamples/output/outcellstats.img")
This example calculates the standard deviation per cell on several input GRID rasters and outputs the result as a GRID raster.
# Name: CellStatistics_Ex_02.py # Description: Calculates a percell statistic from multiple rasters # Requirements: Spatial Analyst Extension # Author: ESRI # Import system modules import arcpy from arcpy import env from arcpy.sa import * # Set environment settings env.workspace = "C:/sapyexamples/data" # Set local variables inRaster01 = "degs" inRaster02 = "negs" inRaster03 = "cost" # Check out the ArcGIS Spatial Analyst extension license arcpy.CheckOutExtension("Spatial") # Execute CellStatistics outCellStatistics = CellStatistics([inRaster01, inRaster02, inRaster03], "RANGE", "NODATA") # Save the output outCellStatistics.save("C:/sapyexamples/output/cellstats")