CityJSON (3D City Model)
Open BetaExporteer gebouwen naar CityJSON 2.0 voor 3D-stadsmodellering. Compact JSON-formaat met vertex-deduplicatie. Ondersteund in 3DCityDB, QGIS 3D en de ninja-viewer.
Belangrijkste functies
Over het CityJSON-formaat
CityJSON is a compact way of writing the same city model as CityGML, but in ordinary JSON instead of bulky XML. The same set of concepts (buildings, level of detail, attributes), only the file is many times smaller and is parsed by any language without special libraries. It is a recognized OGC community standard, not an amateur invention.
The format is chosen when a semantic 3D model is needed on the web, in scripts or in exchange between teams: to look at it in a browser viewer, to run it through Python, to put it into a repository, to hand it to colleagues without a heavy GIS stack.
The output is a single file: buildings at LOD1 detail are written as closed volumes extruded from OSM outlines. Vertices are stored as integers with millimeter precision through a scale factor and are deduplicated, so the file comes out noticeably lighter than the equivalent XML. The metadata records the coordinate system and the bounds of the model, and the buildings carry height, floor count and class.
Welk programma opent CityJSON-bestanden
De volgende programma's en toepassingen kunnen CityJSON (3D City Model)-bestanden (.city.json) die uit OSM2CDR zijn geëxporteerd openen, bewerken en verwerken:
Format specifications
- Open standard
- 3D coordinates supported
- Lossless (no quality loss)
- Stores feature attributes
- Output: 1 file
- CityJSON 2.0 (OGC community standard). Lightweight JSON encoding of CityGML. Opens in QGIS plugin, ninja, FME.
Wie gebruikt CityJSON-kaarten
CityJSON exporteren
Openen na de export
- ninja (a free web viewer for CityJSON) — drag the file into the browser window and see the model at once; the fastest way to check the result.
- cjio (Python, free) — the command cjio file.city.json info shows statistics and checks the structure, while export converts the model into OBJ or other formats.
- QGIS 3 — CityJSON opens through the 3D view, convenient for looking at the buildings together with the flat layers of the map.
- Blender — import through the CityJSON add-on, if the model is needed for visualization rather than for computations.
- 3DCityDB and FME — accept CityJSON on a par with CityGML, if the model is headed for a city database.
Populaire kaarten in CityJSON
Ontvang CityJSON (3D City Model)-kaartexports
Download professionele CityJSON-kaarten van OpenStreetMap. Directe generatie, elk gebied.
Veelgestelde vragen
Vergelijken met andere formaten
Verwante formaten
Vaak samen geëxporteerd
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