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MicroStation DGN (Bentley CAD)

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.dgn · application/vnd.bentley.dgn

DGN is the native binary CAD format of Bentley MicroStation, alive since 1984 and dominant in large infrastructure: highways, railway corridors, plant process diagrams. Our exporter writes DGN V7 (ISFF) through the GDAL/OGR DGN driver: OSM objects are distributed across levels 1-63, line, polygon and point geometry is converted into DGN elements, and the UOR scale is derived from the order's own coordinates, so the file carries real metres of the chosen system. DGN V7 cannot declare a coordinate system inside itself — the format has no field for one; if you picked a system explicitly the order arrives as a ZIP archive: map.dgn plus map.prj describing it. Without an explicit choice the output is unchanged — a single .dgn file. The file opens in MicroStation, the free Bentley View, QGIS, and AutoCAD via its built-in DGN translator.

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