M Tolerance
Release 9.3 Last modified December 17, 2008	Print all topics in : "General settings"

NOTE: This environment is only applicable to ArcGIS 9.2 or higher.

Specify the M tolerance that will be used for processing and set to the output geodataset.

Learn more about M tolerance.

Usage tips

• Unlike XY and Z tolerance, the M tolerance of a feature class inside a feature dataset is not constrained to match the feature dataset's M tolerance. For feature classes created inside a feature dataset, the feature dataset's M tolerance is used as the default. To override this default, set the M tolerance environment to the desired value.
  


• If the output is a stand-alone feature class, raster catalog, or feature dataset, the tolerance of the input will be used as the processing and set as the output geodataset's M tolerance. For tools that have multiple inputs (Intersect, for example) the tolerance of the first input in the list will be used as the default. To override these defaults, set the M tolerance environment to the desired value.
  


• If the tool does not have an input geodataset (for example, Create Feature Class, Create Feature Dataset, and Raster Catalog) and if the environment is left blank, the default M tolerance is set to 0.001 unit. To override this default, set the environment to the desired value.
  


• If the M tolerance is not at least twice as large as the M resolution value, the M tolerance will be set to be twice as large as the M resolution by default.
  


• Tolerance will not be persisted to a dataset in a pre-9.2 geodatabase.
  


• Learn more about specifying general settings.
  
• Learn more about environment settings.
  
• Learn more about environment levels and hierarchy.
  

Command line syntax

An overview of the command line window

MTolerance <Linear unit>

Parameters	Explanation	Data type
<Double>	Tolerance value for adjusting m-values during cluster processing. The default value is 10 * the M resolution.	Double

Data types for geoprocessing tool parameters

Command line example

MTolerance 0.02

Scripting syntax

An overview of scripting in geoprocessing

MTolerance (Linear unit)

Parameters	Explanation	Data type
Double (Required)	Tolerance value for adjusting m-values during cluster processing. The default value is 10 * the M resolution.	Double

Data types for geoprocessing tool parameters

Script example

import arcgisscripting
gp = arcgisscripting.create()

gp.workspace = "h:/workspace"
gp.MTolerance = "0.02"

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