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rework postcode computation

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Now adds areas to location_postcodes, ignores postcode points
inside areas and supports customizable extents.
This commit is contained in:
Sarah Hoffmann
2025-12-23 15:46:36 +01:00
parent a97b5d97cb
commit d1cb578535
5 changed files with 291 additions and 176 deletions
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15
lib-sql/functions/utils.sql
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@@ -323,6 +323,17 @@ END;
$$
LANGUAGE plpgsql;
-- Return the bounding box of the geometry buffered by the given number
-- of meters.
CREATE OR REPLACE FUNCTION expand_by_meters(geom GEOMETRY, meters FLOAT)
RETURNS GEOMETRY
AS $$
SELECT ST_Envelope(ST_Buffer(geom::geography, meters, 1)::geometry)
$$
LANGUAGE sql IMMUTABLE PARALLEL SAFE;
-- Create a bounding box with an extent computed from the radius (in meters)
-- which in turn is derived from the given search rank.
CREATE OR REPLACE FUNCTION place_node_fuzzy_area(geom GEOMETRY, rank_search INTEGER)
@@ -341,9 +352,7 @@ BEGIN
radius := 1000;
END IF;
RETURN ST_Envelope(ST_Collect(
ST_Project(geom::geography, radius, 0.785398)::geometry,
ST_Project(geom::geography, radius, 3.9269908)::geometry));
RETURN expand_by_meters(geom, radius);
END;
$$
LANGUAGE plpgsql IMMUTABLE PARALLEL SAFE;