Convert TOPOJSON to DGN Online - Free & Fast

What is TOPOJSON?

TopoJSON is an extension of GeoJSON that encodes topology, sharing boundary arcs between adjacent features to dramatically reduce file size for map data.

What is DGN?

DGN (Design) is the native file format of Bentley Systems MicroStation, used for storing CAD drawings and GIS data in infrastructure projects such as roads, bridges, and utilities, supporting 2D and 3D design elements with level-based organization.

When Should You Use TOPOJSON vs DGN?

TOPOJSON vs DGN: Key Differences

• •TOPOJSON and DGN diverge on compression: lossy compression for the source, lossy compression for the target.
• •Neither format changes compression philosophy — both are lossy compression — so any size differences are due to encoding efficiency, not a shift in quality approach.
• •How transparency is handled: DGN does not support alpha channels — transparent areas in the source will become opaque.
• •Storage footprint: 80% smaller than equivalent GeoJSON for administrative boundaries for TOPOJSON vs 100KB to 1GB depending on design complexity for DGN.
• •Primary audience: TOPOJSON is built for web choropleth maps, data visualization, boundary simplification scenarios, while DGN focuses on civil engineering, infrastructure mapping, transportation gis — pick the format that matches your output requirement.

Advantages of TOPOJSON

• ✓TOPOJSON uses lossy compression tailored for Web choropleth maps, data visualization, boundary simplification.
• ✓TOPOJSON is supported natively on virtually every device, browser, and operating system.
• ✓TOPOJSON files are compact and quick to transfer, even over slow connections.
• ✓TOPOJSON integrates seamlessly with all major creative tools and workflows.

Advantages of DGN

• ✓DGN uses lossy compression tailored for Civil engineering, infrastructure mapping, transportation GIS.
• ✓DGN is supported natively on virtually every device, browser, and operating system.
• ✓DGN files are compact and quick to transfer, even over slow connections.
• ✓DGN integrates seamlessly with all major creative tools and workflows.

Common Use Cases for TOPOJSON to DGN Conversion

Industry Applications

Best Practices for TOPOJSON to DGN Conversion

• →When converting TOPOJSON to DGN: confirm the coordinate reference system (CRS / projection) is preserved or explicitly reprojected
• →Keep attribute tables and feature metadata intact — DGN should retain all fields from TOPOJSON
• →Check geometry types (point, line, polygon) map cleanly between the two formats
• →Verify that z/elevation values and topology survive the conversion when working with terrain data
• →Always keep a backup of your original files before converting
• →Choose the appropriate quality settings for your specific use case

Troubleshooting TOPOJSON to DGN Conversion

• !DGN features land in the wrong place after TOPOJSON to DGN → verify the CRS/projection; mismatched coordinate systems shift geometry
• !Attribute columns missing in DGN → some GIS formats have field name length or type limits; rename or cast columns first
• !TOPOJSON to DGN drops the z/elevation dimension → pick a target format that supports 3D geometry
• !DGN file won't open in your GIS app → confirm the format version and any required sidecar files (e.g. .prj, .shx) are present

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