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.
主要特点
关于 DGN 格式
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.
打开 DGN 文件的程序
以下程序可以打开、编辑和处理从 OSM2CDR 导出的 MicroStation DGN (Bentley CAD)（.dgn）文件：
格式规格
- 专有格式
- 仅 2D
- 无损（无质量损失）
- 存储要素属性
- 输出：1 个文件
- 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.
谁在使用 DGN 地图
如何导出 DGN
导出后如何打开
- 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.
DGN 格式的热门地图
导出 MicroStation DGN (Bentley CAD) 地图
从 OpenStreetMap 下载专业的 DGN 地图。即时生成，任意区域。
常见问题
相关格式
经常一起导出
Related Articles
MicroStation DGN — Bentley's native format for AEC and infrastructure
Deep guide to Bentley's MicroStation — the AutoCAD competitor for AEC, rail, roads. V7 → V8 history, ecosystem, OpenRoad
formatDGN (MicroStation Design) format: Bentley CAD 1984 — OSM export to DGN V8
DGN from Bentley MicroStation 1984: V7 vs V8 spec, ODA Teigha, AEC infrastructure pipeline, OSM object export to DGN.