TopoJSON
A topology-aware JSON format that encodes shared boundaries once, often smaller than GeoJSON.
Category: Files & Data
Definition (expanded)
TopoJSON represents geometries using shared arcs, which reduces file size when many polygons share borders. It is great for web maps and thematic boundaries. Many tools convert TopoJSON to GeoJSON before editing because the topology encoding is different from standard GeoJSON geometries.
Related terms
GeoJSONA JSON format for geographic features, using objects like Feature, FeatureCollection, and geometry types like Polygon and MultiPolygon.PolygonA closed area geometry defined by an exterior ring and optional interior rings (holes).MultiPolygonA geometry containing multiple polygons (parts), each with its own exterior ring and optional holes.