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don't crash

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This commit is contained in:
Andras Schmelczer 2026-06-04 20:40:42 +01:00
parent aab85fe32e
commit d6d20ccd37
13 changed files with 2630 additions and 3924 deletions
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7
pipeline/transform/postcode_boundaries/greenspace.py
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@ -5,9 +5,10 @@ from pathlib import Path
import polars as pl
from shapely import wkb
from shapely.geometry import MultiPolygon, Polygon
from shapely.ops import unary_union
from shapely.strtree import STRtree
from .geometry import safe_difference, safe_union
def load_greenspace(path: Path) -> tuple[STRtree, list]:
"""Load greenspace parquet and build an STRtree spatial index.
@ -51,8 +52,8 @@ def subtract_greenspace(
if not intersecting:
return postcode_geom
green_union = unary_union(intersecting)
result = postcode_geom.difference(green_union)
green_union = safe_union(intersecting)
result = safe_difference(postcode_geom, green_union)
if result.is_empty:
return postcode_geom