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To define a projection for a coverage, select a map projection and specify its parameters interactively using ArcCatalog.
For this example, assume that the coverage, to be defined, is stored with the following parameters:
Coordinate System: Geographic
Units: Decimal Degree
Datum: NAD 1927
Spheroid: Clarke 1866
This is based on the above parameters, the projection that you select is based on the projection that the coverage is stored in.