M Resolution

• Unlike XY and Z resolution, the M resolution of a feature class inside a feature dataset is not constrained to match the feature dataset's M resolution. For feature classes created inside a feature dataset, the feature dataset's M resolution is used as the default. To override this default, set the M resolution environment to the desired value.
• If the output is a standalone feature class, raster catalog or feature dataset, the tolerance of the input will be used as the processing and set as the output feature class' Z resolution. For tools that have multiple inputs (Intersect for example) the resolution of the first geodataset in the list will be used as the default. To override these defaults, set the Z resolution environment to the desired value.
• If the tool does not have an input geodataset (for example, Create Feature Class, Create Feature Dataset, and Create Raster Catalog) and if the environment is left blank, the default M resolution is set to 0.001 units. To override this default, set the environment to the desired value.
• Learn more about specifying general settings
• Learn more about environment settings
• Learn more about environment levels and hierarchy

Command line example

MResolution 0.002

Script example

import arcgisscripting
gp = arcgisscripting.create()

gp.workspace = "h:/workspace"

gp.MResolution = "0.002"