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Fix overlapping county borders in well-density-by-county #113

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Merged
jirhiker merged 1 commit into from
Jul 8, 2026
Merged

Fix overlapping county borders in well-density-by-county #113

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7 changes: 6 additions & 1 deletion backend/bounding_polygons.py
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Original file line number Diff line number Diff line change
Expand Up @@ -83,8 +83,13 @@ def get_state_polygon(state: str, buffer: int | None = None):

# private helpers ============================
def _make_shape(obj, as_wkt):
# Use the full-resolution source geometry. Do NOT simplify: adjacent
# counties share exact boundary vertices in the source data, so any
# per-county simplification moves those shared vertices independently and
# makes neighboring county borders overlap (or gap). Keeping full
# resolution guarantees shared borders stay coincident. See fix for the
# "well density by county" overlap artifact.
poly = shape(obj["geometry"])
poly = poly.simplify(0.1)
if as_wkt:
return poly.wkt
return poly
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