If the CAD or BIM file is drawn in feet, choose an Esri projection file that is also in feet.
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To accurately place CAD or BIM data in ArcGIS Pro, determine the system of linear units of the CAD or BIM files.
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In many cases, assigning the correct Esri coordinate system allows the CAD or BIM design files to be positioned in the correct geospatial location without the need to define a coordinate transformation file (WLD3) using ArcGIS Pro positioning tools. AutoCAD drawings used with ArcGIS for AutoCAD will have a coordinate system included and recognized in the DWG file and do not need an ancillary projection file (PRJ).ĬAD and BIM data can be drawn in the correct geographic location, but when the file is read in ArcGIS Pro, the file may not have an Esri coordinate system included. The ESRI_CAD.prj file is sometimes called the universal projection file. prj file can default to a specially named coordinate system definition file, esri_CAD.prj in the same file directory. Optionally, any CAD or BIM file that does not have a matching. A projection file with the same name as the BIM or CAD file is used to define that file's coordinate system (. prj file is a text file containing information that defines a coordinate system, data, and map projection. Required coordinate system definition (PRJ)Īn Esri.
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Positional modifications made using these tools update a world file (WLD3) that is stored in the file folder of the CAD or BIM file. Tools on the position ribbon reposition your CAD or BIM data without changing the original source data. Once added to a map or scene, you can modify the position of CAD or BIM data with various positioning tools found on the Position tab that appears with the Manage main ribbon for CAD and BIM data. You can validate the positioning information for any CAD or BIM file by inspecting the file properties in Catalog and fixing warnings and errors with positioning information. You can analyze the spatial positioning information of a CAD or BIM file from the file properties dialog box of CAD and BIM files in Catalog, or from the Manage ribbon tab of CAD or BIM layers in ArcGIS Pro. Validate CAD and BIM file positioning information Such data would not need a spatial offset world file (WLD3). You can author CAD or BIM files using coordinates that correlate to a known world coordinate system, and then add Esri coordinate system reference information from an projection file (PRJ), or include the coordinate system definition in an AutoCAD drawing created with ArcGIS for AutoCAD. You have the option to reposition data using the 2D georeferencing or 3D georeferencing tools for CAD and BIM data. If the coordinates within the CAD or BIM file do not correspond to the identified coordinate system, you must define how the coordinates should be transformed to move, scale, and rotate the data into the proper position within the chosen coordinate system. First, you must identify the Esri coordinate system reference that defines how ArcGIS will interpret the coordinates stored in the file. Properly positioning CAD and BIM data in ArcGIS Pro may involve two distinct parts. Notifications will guide you to choose the proper coordinate system. You will be alerted by ArcGIS Pro when attempting to add CAD or BIM data that does not have a proper coordinate system. CAD and BIM files are required to have a valid Esri coordinate system (PRJ file) and may require an optional coordinate transformation information (WLD file) to identify how the coordinates in the CAD or BIM data should be positioned on the Earth's surface. Optional spatial transformation offset (world files)ĬAD and BIM data is a common source of GIS content, but before it can be used within ArcGIS Pro, the data must have a defined geospatial location.Required coordinate system definition (PRJ).
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