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feat: accept closed LineStrings as AOI outlines on import #7320

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feat: accept closed LineStrings as AOI outlines on import #7320

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feat: accept closed LineStrings as AOI outlines on import
dulcetberg Aug 22, 2026
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[pre-commit.ci] auto fixes from pre-commit.com hooks
pre-commit-ci[bot] Aug 22, 2026
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14 changes: 12 additions & 2 deletions backend/services/grid/grid_service.py
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Original file line number Diff line number Diff line change
Expand Up @@ -179,12 +179,22 @@ def _adapt_feature_geometry(feature: geojson.Feature) -> geojson.Feature:
:param feature: geojson.feature to be adapted
:return: feature with geometry adapted
"""
geometry = feature.geometry
if isinstance(geometry, geojson.geometry.LineString):
# A closed LineString (first/last coordinate match, at least 4
# points) is unambiguously a polygon outline. Tools like
# geojson.io convert a closed .osm way to a LineString rather
# than a Polygon, which otherwise gets rejected outright.
coordinates = geometry["coordinates"]
if len(coordinates) >= 4 and coordinates[0] == coordinates[-1]:
geometry = geojson.geometry.Polygon([coordinates])

if isinstance(
feature.geometry, (geojson.geometry.Polygon, geojson.geometry.MultiPolygon)
geometry, (geojson.geometry.Polygon, geojson.geometry.MultiPolygon)
):
# adapt the geometry for use as a shapely geometry
# http://toblerity.org/shapely/manual.html#shapely.geometry.asShape
feature.geometry = shapely.geometry.shape(feature.geometry)
feature.geometry = shapely.geometry.shape(geometry)
return feature
else:
return None
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