Level of Comparison Between Projection Files (Environment setting)

Tools that honor the Level of Comparison Between Projection Files environment only execute if the input projections match to the degree that is specified.

Usage notes

• Similar projections and parameters that are defined in different ways will not match. For example, UNITS METERS and UNITS 1 (which are equal) will not match. Defining UTM and State Plane projections by their central meridians or parallels will not match with the same projection defined using the ZONE option.
• For any operation that copies the PRJ file, the first one entered will be the projection of the output, as with the TIC and BND operations.
• Use this environment if you want to validate the input projections before running coverage tools.

Dialog syntax

• NONE—Any combination of projection information will result in a match. Either all input projections can be UNKNOWN, or each input can have a different projection defined. This is the default.
• PARTIAL—At least one projection file must be defined; the others can be UNKNOWN and will result in a match.
• FULL—All projection information must be specified and identical in the projection file of each input dataset.

Scripting syntax

arcpy.env.projectCompare = projectcompare_option

projectcompare_option	Explanation
NONE	Any combination of projection information will result in a match. Either all input projections can be UNKNOWN, or each input can have a different projection defined. This is the default.
PARTIAL	At least one projection file must be defined; the others can be UNKNOWN and will result in a match.
FULL	All projection information must be specified and identical in the projection file of each input dataset.

projectCompare syntax

import arcpy

# Set the projectCompare environment to FULL
arcpy.env.projectCompare = "FULL"