Autodesk Infrastructure Studio must be able to detect the coordinate system of a feature source to be able to display the features in a map. You can see the coordinate system assigned to a feature source on the feature source editor pane. If Autodesk Infrastructure Studio cannot detect the coordinate system information, <unknown> will be displayed in the feature source editor. You can override the coordinate system of any feature source.
For more information about coordinate systems, see Setting the Coordinate System for Your Map.