Cell size
Release 9.2 Last modified September 4, 2007	Print all topics in : "Raster Analysis settings"

The output cell size, or resolution, for any operation or function. The default output resolution is determined by the coarsest of the input raster datasets.

The output cell size, or resolution, for any operation or function can be set to any size desired. The default output resolution is determined by the coarsest of the input raster datasets.

Learn more about setting the Cell Size

Usage tips

• The keyword used at the command line or in scripts for this environment setting is CellSize.
  
• The default cell size (or resolution) for analysis results is set to the largest cell size of the raster datasets in the table of contents—Maximum of Inputs.
  
• The default cell size when a feature dataset is used as input to a function is to take the width or height (whichever is shorter) of the extent of the feature dataset and divide by 250.
  
• Learn more about specifying raster analysis settings
  
• Learn more about environment settings
  
• Learn more about environment levels and hierarchy
  

In ModelBuilder

• In ModelBuilder, Cell Size will also show a list of variables. If you create raster dataset, raster layer, or cell size variables in your model you will see these as selectable options in the cell size drop-down list. These choices are easily recognizable because they appear as either "Same as variable < RasterName >" or "Same as layer < RasterName >".
  


• The list will also show derived data in the drop down list. Derived data by definition does not already exist before the model is executed and therefore can't be selected as the model cell size. So if you are setting the cell size for the entire model do not select derived data.
  


• You can selected derived data only if you are setting the cell size for a single process and the derived data will be created before the process will execute. In your model diagram you will see a condition connector line appear that forces the model to first execute the process with the derived data element.
  


• In ArcGIS 9.2, Cell Size is dynamic which allows for the additional selection of raster dataset, raster layer, or cell size variables. However, if you open the cell size environment and choose As specified below, the cell size will become static. The variable you had selected will no longer define the extent and the connector line will be automatically removed from your model. To make cell size dynamic again you will need to re-set the cell size by selecting a different drop-down list choice.
  

Command line syntax

An overview of the command line window

CellSize <MAXOF | MINOF | value>

Parameters	Explanation	Datatype
<MAXOF | MINOF | value>	The value of the cell size. MAXOF (Maximum of inputs)—Largest cell size of all input datasets. This is the default. MINOF (Minimum of inputs)—Smallest cell size of all input datasets. As specified below—Specify your own cell size value.	String

Data types for geoprocessing tool parameters

Command line example

CellSize 20
     OR
CellSize MAXOF

Scripting syntax

An overview of scripting in geoprocessing

CellSize (cellsize)

Parameters	Explanation	Datatype
CellSize (Required)	The value of the cell size. MAXOF (Maximum of inputs)—Largest cell size of all input datasets. This is the default. MINOF (Minimum of inputs)—Smallest cell size of all input datasets. As specified below—Specify your own cell size value.	String

Data types for geoprocessing tool parameters

Script example

import arcgisscripting
gp = arcgisscripting.create()

gp.Workspace = "h:/workspace"
gp.CellSize = 20

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