Tools that honor the Default Output Z Value environment will set the z-coordinate for each output vertex that does not already have a z-coordinate.
For example, if using the Merge tool with two feature classes, one that is z aware and one that is not, the default output z-value (or 0, if the environment is not set) will be assigned only to the vertices that originated from the input feature class that was not z aware.
- The environment will only be used if the output is a z-aware feature class. For further details, see Output has Z Values.
- A unique z-value, such as -9999, that is outside the range of normal z-coordinates can be used to help identify vertices that were assigned the default z-value.
Default Output Z Value—The z-coordinate that will be set on feature vertices written to the output feature that do not already have a z-coordinate.
arcpy.env.outputZValue = double
The z-coordinate that will be set on feature vertices written to the output feature that do not already have a z-coordinate.
import arcpy # Set the outputZValue environment to Enabled arcpy.env.outputZValue = 100