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python reverse: add support for point geometries in interpolations

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This commit is contained in:
Sarah Hoffmann
2023-03-29 17:21:33 +02:00
parent c150ca4889
commit 26ee6b6dde
2 changed files with 45 additions and 2 deletions
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12
nominatim/api/reverse.py
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@@ -66,6 +66,14 @@ def _interpolated_position(table: SaFromClause) -> SaLabel:
else_=table.c.linegeo.ST_LineInterpolatePoint(rounded_pos)).label('centroid')
def _locate_interpolation(table: SaFromClause, wkt: WKTElement) -> SaLabel:
""" Given a position, locate the closest point on the line.
"""
return sa.case((table.c.linegeo.ST_GeometryType() == 'ST_LineString',
sa.func.ST_LineLocatePoint(table.c.linegeo, wkt)),
else_=0).label('position')
def _is_address_point(table: SaFromClause) -> SaColumn:
return sa.and_(table.c.rank_address == 30,
sa.or_(table.c.housenumber != None,
@@ -207,7 +215,7 @@ class ReverseGeocoder:
sql = sa.select(t,
t.c.linegeo.ST_Distance(wkt).label('distance'),
t.c.linegeo.ST_LineLocatePoint(wkt).label('position'))\
_locate_interpolation(t, wkt))\
.where(t.c.linegeo.ST_DWithin(wkt, distance))\
.where(t.c.startnumber != None)\
.order_by('distance')\
@@ -239,7 +247,7 @@ class ReverseGeocoder:
inner = sa.select(t,
t.c.linegeo.ST_Distance(wkt).label('distance'),
sa.func.ST_LineLocatePoint(t.c.linegeo, wkt).label('position'))\
_locate_interpolation(t, wkt))\
.where(t.c.linegeo.ST_DWithin(wkt, 0.001))\
.where(t.c.parent_place_id == parent_place_id)\
.order_by('distance')\