Rename the projection file with an identical name as the CAD dataset, substituting the extension with.Navigate to the directory where the CAD file is stored on the computer.In the Define Projection window, click OK.In the Spatial Reference window, select coordinate system for the CAD dataset, and click OK. For the Coordinate System section, click the browse icon.In the Define Projection window, for Input Dataset or Feature Class section, select the CAD dataset.In the ArcToolbox pane, click Data Management Tools > Projections and Transformations > Define Projection.In ArcMap, click the ArcToolbox icon on the top ribbon.After obtaining the spatial reference (projection) parameters for the CAD data, define the projection for the CAD dataset using the Define Projection tool:. To determine whether the coordinate system is geographic, projected, or local, refer to How To: Identify the spatial reference, projection, or coordinate system of data. To identify the coordinate system used to create the CAD file, if the data source does not have the projection information available, refer to How To: Identify an unknown projected coordinate system using ArcMap 10.1 and later versions to identify the projection for the CAD file. If the CAD data was created in a real-world coordinate system and the data source provides the necessary parameters, refer to Step 1. This is the spatial reference of the CAD data, and information about the spatial reference should be obtained from the data source. The instructions provided in this article describe how to define a projection for CAD data in ArcMap and apply it to DWG or DXF files created in AutoCAD and to DGN files created in Microstation.ĬAD data can be created in a real-world coordinate system, such as State Plane or UTM. Computer Aided Design (CAD) files can be added to ArcGIS and made to overlay other data in ArcMap by defining the projection (coordinate system).
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