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Exporting a 3D shapefile with Z values to CAD data using the Export To CAD tool, even after disabling the Z values option in the Environment Settings, retains the Z values.
In a case where both Z and M values are enabled, the resulting CAD data after the conversion removes the M value, but not the Z value. In some instances, the issue still occurs even after the Check Geometry and the Repair Geometry tools are run on the data to check for geometry problems.
Exporting a shapefile which has Z value features to a CAD format creates Z-aware features, even though there are no elevation values associated with the data. The data to be converted must be imported into a file or personal geodatabase. Fields that control the export process are ignored if the input data is in a shapefile format, hence the Export to CAD tool ignores settings such as removing Z values.
The input shapefile must be converted to a geodatabase feature class, and the Z and M values must be removed by modifying the values in the Environments Settings. To convert the 3D with Z and M data to plain 2D data, follow the steps below: