# Boundary dataset provenance — SDA 1/20 000

• Dataset: Découpages administratifs à l'échelle 1/20 000 (SDA)
• Producer: Gouvernement du Québec — Ministère des Ressources naturelles et des Forêts (MRNF), Registre du domaine de l'État
• Catalog page: https://www.donneesquebec.ca/recherche/dataset/decoupages-administratifs
• File downloaded: SDA.gpkg.zip (GPKG), https://diffusion.mern.gouv.qc.ca/diffusion/RGQ/Vectoriel/Theme/Local/SDA_20k/GPKG/SDA.gpkg.zip
• Download date: 2026-08-06
• Version: V2026-07 (layer attribute *_CO_VER)
• Native CRS: EPSG:4269 (NAD83 geographic); metric operations performed in EPSG:32198 (NAD83 / Quebec Lambert)
• Layers used:
  • munic_s — municipal polygons (geocode, name, MRC, administrative region)
  • regio_s — 17 administrative regions (map rendering)
  • mrc_s — MRCs (optional intermediate level)
• License: CC-BY 4.0 (Données Québec)

Join result persisted at data/processed/geo_join.parquet (one row per transaction id; join_method ∈ {within, nearest<=1km, unassigned}). Validation: 100.000% within, 99.92% name agreement with the raw city field (see outputs/reports/geography_report.md).