# 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`).