The spatial reference for a geodatabase feature class is unknown after importing CAD data

Description

The spatial reference for a geodatabase feature class is unknown after importing CAD data.

Cause

The CAD data that was imported into the geodatabase did not have a spatial reference.

Solution or Workaround

• Define the spatial reference of the geodatabase feature class using ArcCatalog.
• Define the spatial reference of the CAD data and re-import it into the geodatabase.
  
  

  Note:
  Instructions for defining a coordinate system for CAD data can be found in the ArcGIS Help under Contents > ArcCatalog > Working with CAD data > Defining a coordinate system for CAD data.