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OpenStreetMap

What it is

OpenStreetMap (OSM) is a collaborative, wiki-style project building a free, editable map of the world (openstreetmap.org). OSM provides both the geographic dataset and a set of public tile endpoints, serving as the canonical open-source alternative to commercial basemap providers (Google Maps, Mapbox, Bing).

Seen in

• sources/2021-12-01-zalando-maps-with-postgresql-and-postgis — Zalando picks OpenStreetMap explicitly as its basemap layer under a Leaflet front-end, with its custom PostGIS/ pg_tileserv tile stack stacked on top for the thematic data (NUTS boundaries, population hexagons). Characterised in the article as "the wiki-style free alternative to commercial map providers". First wiki canonical page.

Related

• systems/leaflet — the client library consuming OSM's tile endpoints.
• systems/postgis — the overlay-data substrate typically layered above an OSM basemap.