Defining a shapefile's coordinate system by importing a coordinate system

Steps:

1. In ArcCatalog, click the shapefile whose coordinate system you want to define.
2. Click the File menu and click Properties.
3. Click the XY Coordinate System tab.
4. Click Import.
5. Navigate to the data source whose coordinate system parameters you want to copy.

   For example, you can get coordinate system information from coverages, rasters, or feature datasets and feature classes in a geodatabase.

6. Click the data source.
7. Click Add.

   The coordinate system's parameters are listed in the Details box.

8. Click OK on the Shapefile Properties dialog box.