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join_polygons: try to catch rare case of MultiPolygon

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Robert Sachunsky 2025-10-15 16:58:17 +02:00 • committed by kba
parent f485dd4181
commit 2ac01ecacc
1 changed files with 2 additions and 0 deletions
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src/eynollah/utils/contour.py
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@ -353,6 +353,8 @@ def join_polygons(polygons: Sequence[Polygon], scale=20) -> Polygon:
bridgep = orient(LineString(nearest).buffer(max(1, scale/5), resolution=1), -1)
polygons.append(bridgep)
jointp = unary_union(polygons)
if jointp.geom_type == 'MultiPolygon':
jointp = unary_union(jointp.geoms)
assert jointp.geom_type == 'Polygon', jointp.wkt
# follow-up calculations will necessarily be integer;
# so anticipate rounding here and then ensure validity