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Andras Schmelczer 2026-03-12 22:11:00 +00:00
parent 14a3555cf1
commit 7e92bf112e
34 changed files with 1214437 additions and 224 deletions
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pipeline/utils/postcode_mapping.py
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@ -10,7 +10,7 @@ from scipy.spatial import cKDTree
def build_postcode_mapping(arcgis_path: Path) -> pl.DataFrame:
"""Build a mapping from terminated England postcodes to their nearest active postcode.
Uses OS National Grid coordinates (oseast1m, osnrth1m) which are Cartesian meters,
Uses OS National Grid coordinates (oseast1m, osnrth1m) which are Cartesian metres,
so Euclidean distance via cKDTree gives accurate results without projection.
"""
arcgis = pl.scan_parquet(arcgis_path).filter(pl.col("ctry") == "E92000001")