TopoJSON (Topology-Aware JSON)
Open BetaTopoJSON ni kiendelezi cha GeoJSON kinachofahamu topolojia. Hutumia usimbaji wa upinde-shirikiwa (mipaka kati ya poligoni huhifadhiwa mara moja tu) na uwekaji wa viratibu katika namba kamili — faili itokeayo ni ndogo kwa 60-80% kuliko GeoJSON sawa. Ingizo la kawaida kwa D3.js, Mapshaper, na Observable; linafaa kwa ramani shirikishi za korapleti na atlasi za wavuti.
OpenStreetMap data as of 24 August 2026 · 45 days ago
Vipengele Muhimu
Kuhusu Muundo wa TopoJSON
TopoJSON was invented by Mike Bostock, the author of D3.js, to solve a simple problem: in GeoJSON neighboring polygons store their shared border twice. TopoJSON moves all the lines into a common array of arcs that the objects then refer to. On top of that, coordinates are rounded to an integer grid and written as increments — the file gets sharply lighter.
The format is taken for web graphics and analytics: choropleths in D3, interactive atlases, boundary maps in Observable, lightweight layers for offline applications. The second motive is simplification: during generalization the shared borders move together, and no gaps appear between neighboring districts.
The output is a single document: every layer becomes a separate object inside it — roads, buildings, water and so on — and object attributes are preserved. Coordinates are in WGS84, up to 100,000 objects per layer. The topology is built by our own code, with no external dependencies.
The price of compactness is the rounding of coordinates. The grid step depends on the size of the area: for a district it is on the order of a meter, for a country hundreds of meters. For a web map that is invisible; for precise measurements take GeoJSON or GeoPackage.
Programu Gani Hufungua Faili za TopoJSON
Programu na programu-tumizi zifuatazo zinaweza kufungua, kuhariri, na kufanya kazi na faili za TopoJSON (Topology-Aware JSON) (.topojson) zilizosafirishwa kutoka OSM2CDR:
Format specifications
- Open standard
- 2D only
- Lossless (no quality loss)
- Stores feature attributes
- Output: 1 file
- TopoJSON (open spec). Topologically encoded GeoJSON: shared borders stored once, file size 30-80% smaller. Used by D3.js.
Nani Hutumia Ramani za TopoJSON
Jinsi ya Kusafirisha TopoJSON
Jinsi ya Kufungua Baada ya Kuhamisha
- D3.js — include topojson-client and unpack the layer you need: topojson.feature(topology, topology.objects.buildings), then the usual d3.geoPath.
- Mapshaper — drag the file onto mapshaper.org: objects and attributes are visible, and simplification and export to SHP or GeoJSON are right there.
- QGIS — opens .topojson as an ordinary vector layer through GDAL; handy for checking the geometry with your own eyes.
- Converting to GeoJSON — topo2geo buildings=buildings.geojson < map.topojson from the topojson-client package, or ogr2ogr.
- Leaflet and MapLibre — they do not understand the format directly: unpack it into GeoJSON on the client with the topojson-client library and feed it on as usual.
Ramani maarufu katika TopoJSON
Pata usafirishaji wa ramani za TopoJSON (Topology-Aware JSON)
Pakua ramani za kitaalamu za TopoJSON kutoka OpenStreetMap. Uzalishaji wa papo hapo, eneo lolote.
Maswali Yanayoulizwa Mara kwa Mara
Convert to TopoJSON and back
What people who already downloaded say
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Наконец-то карты можно скачать в векторе. Автору спасибо!
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ОГРОМНОЕ СПАСИБО!!! ОЧЕНЬ ХОРОШАЯ ПРОГРАММА!!! Искал карту в векторе на стыке 3 стран - очень помогло!!
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