IGN / INSEE (Admin Express, BD TOPO®) via the open-data project france-geojson. Licence Ouverte / Open License 2.0 (Etalab).
The 319-commune Champagne AOC "aire de production du raisin" and the Échelle des Crus (17 Grand Cru, 42 Premier Cru villages) are compiled from INAO's cahier des charges for AOC Champagne, cross-checked against independent Champagne-region references. The Échelle des Crus was retired from official pricing use in 2010 but the village rankings are still used for labelling.
Four communes formed by post-2016 municipal mergers — Aÿ-Champagne, Val de Livre, Blancs-Coteaux and Vallées en Champagne — combine historic villages of different cru status into one shape. Each is shown at its highest constituent cru; open its detail panel for the exact breakdown.
Exact planted grape-variety percentages and harvest tonnage, by commune or by parcel, are not published as open data anywhere: France's vineyard register (the Casier Viticole Informatisé) is protected by tax-confidentiality law, confirmed by a formal access refusal from CADA, the French freedom-of-information authority. What's shown here instead: the "dominant grape" field on the 59 Grand Cru / Premier Cru villages is a traditional/typical designation compiled from wine-trade sources (village profiles, grower and Champagne-house sites), not an official measurement — treat close calls (labelled "medium" or "mixed") as informative rather than precise. The 38% / 31% / 31% appellation-wide split and the annual authorized yield (kg/ha) are official Comité Champagne figures, but apply to the whole AOC, not to any single village or parcel.
Who owns which parcel is not public information in France: the cadastre's open data explicitly excludes owner identity, and the French freedom-of-information authority (CADA) has separately confirmed the vineyard register is protected by tax confidentiality. What is public: houses openly publicise their prestige walled single-vineyards ("Clos"), and the Comité Champagne publishes the region's aggregate ownership split. The gold markers show 14 well-documented Clos owned by named major houses (Krug, Bollinger, Philipponnat and others), compiled from wine-trade sources — not a comprehensive ownership map, and it excludes smaller grower-owned clos.
This first edition maps at village level. A future layer of individual vineyard parcels — sourced from INAO's national parcel-delimitation dataset — is planned but not yet included here.