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This commit is contained in:
Andras Schmelczer 2026-02-08 10:21:37 +00:00
parent 2906b01734
commit 42ee2d4c51
47 changed files with 848 additions and 478 deletions
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16
pipeline/transform/postcode_boundaries/process_oa.py
View file

@ -42,7 +42,10 @@ def process_oa(
for pc, polys in pc_inspire_polys.items():
merged = unary_union(polys)
clipped = merged.intersection(oa_geom)
if not merged.is_valid:
merged = make_valid(merged)
valid_oa = oa_geom if oa_geom.is_valid else make_valid(oa_geom)
clipped = merged.intersection(valid_oa)
if not clipped.is_empty:
if not clipped.is_valid:
clipped = make_valid(clipped)
@ -58,11 +61,13 @@ def process_oa(
used = None
for pc, geom in claimed.items():
if used is not None:
if not geom.is_valid:
geom = make_valid(geom)
if not used.is_valid:
used = make_valid(used)
geom = geom.difference(used)
if geom.is_empty:
continue
if not geom.is_valid:
geom = make_valid(geom)
geom = _extract_polygonal(geom)
if geom is None:
continue
@ -75,11 +80,12 @@ def process_oa(
all_claimed = unary_union(list(claimed.values()))
if not all_claimed.is_valid:
all_claimed = make_valid(all_claimed)
remaining = oa_geom.difference(all_claimed)
valid_oa = oa_geom if oa_geom.is_valid else make_valid(oa_geom)
remaining = valid_oa.difference(all_claimed)
if not remaining.is_valid:
remaining = make_valid(remaining)
else:
remaining = oa_geom
remaining = oa_geom if oa_geom.is_valid else make_valid(oa_geom)
# Distribute remaining area via Voronoi
if not remaining.is_empty and remaining.area > 0.01:

5
pipeline/transform/postcode_boundaries/voronoi.py
View file

@ -75,6 +75,9 @@ def compute_voronoi_regions(
n_real = len(pts)
pc_polys: dict[str, list[Polygon]] = defaultdict(list)
if not boundary.is_valid:
boundary = make_valid(boundary)
for i in range(n_real):
region_idx = vor.point_region[i]
region = vor.regions[region_idx]
@ -100,6 +103,8 @@ def _equal_split_fallback(
postcodes: list[str], boundary: Polygon | MultiPolygon
) -> dict[str, Polygon | MultiPolygon]:
"""Split boundary into roughly equal horizontal strips, one per postcode."""
if not boundary.is_valid:
boundary = make_valid(boundary)
min_x, min_y, max_x, max_y = boundary.bounds
n = len(postcodes)
result = {}