In this study, we attempted to realize the conversion of CAD data such as commercial plans into ArcGIS. Based on actual requirements for the conversion of CAD DWG data to ArcGIS in engineering practices, a CAD data conversion tool was developed on the basis of the open source C# class library Teigha.NET. CAD data are pretreated and then sent to this tool after the established graph specifications are satisfied. Graphic conversion is performed and the graphics are sent to the map issuance system after topologic check and geometric error repair by ArcGIS. This tool has been applied to convert data of commercial plans, and the conversion results indicated that the proposed conversion method exhibits high graphic conversion efficiency, satisfies the requirement for map display, saves working hours, and improves work efficiency.
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