MicroStation DGN (Bentley CAD)
Open BetaDGN 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.
Caratteristiche principali
Informazioni sul formato DGN
DGN is the native format of Bentley MicroStation, alive since 1984. Where AutoCAD took architecture, MicroStation settled in large infrastructure: highways, railway corridors, bridges, industrial sites. If a project is run in OpenRoads or OpenRail, the base plan has to arrive in DGN as well — otherwise it turns into an alien import.
An OSM map is exported for context: the streets, buildings, water and greenery around the design site. That saves the preliminary survey stage at the concept phase and gives the contractor a clear tie to the terrain.
The output is a single .dgn file in version V7 (ISFF), written by our own code without third-party SDKs. OSM layers are laid out across DGN levels from the first to the sixty-third, lines, polygons and points become native drawing elements, and the coordinates are converted into UOR units and centered on the map extent. Long lines are automatically cut into segments, because the format limits the number of vertices in a single element.
There are no text labels and no Bentley-specific objects in the file — this is geometry for a base plan, not a finished drawing with a specification.
Quale programma apre i file DGN
I seguenti programmi e applicazioni possono aprire, modificare ed elaborare i file MicroStation DGN (Bentley CAD) (.dgn) esportati da OSM2CDR:
Format specifications
- Proprietary format
- 2D only
- Lossless (no quality loss)
- Stores feature attributes
- Output: 1 file
- A Bentley DGN V7 (ISFF) file written by the GDAL/OGR DGN driver: OSM layers map onto levels 1-63, the UOR scale is derived from the order coordinates. DGN V7 stores no CRS, so an explicitly chosen system ships as map.prj beside the drawing in a ZIP.
Chi usa le mappe DGN
Come esportare in DGN
Come aprire il file dopo l'esportazione
- MicroStation — open the file directly; to make the map a true base plan, attach it through References (an external reference) rather than inserting it into the active model.
- Bentley View (free) — the official viewer: open, look through the levels, measure distances, print.
- AutoCAD — the DGNIMPORT command brings the geometry into the drawing, DGNATTACH attaches the file as an external reference without importing.
- QGIS — reads V7 through the OGR_DGN driver, if the map has to be checked against other GIS layers.
- If you need version V8 — open the file in MicroStation and re-save it, or convert it with the free ODA File Converter.
Mappe popolari in DGN
Ottieni esportazioni di mappe in MicroStation DGN (Bentley CAD)
Scarica mappe DGN professionali da OpenStreetMap. Generazione istantanea, qualsiasi area.
Domande frequenti
Formati correlati
Esportati spesso insieme
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