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polyline_precision parameter + ST_LineFromEncodedPolyline bug workaround

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This commit is contained in:
cquest 2016-07-31 13:22:09 +02:00
parent d8c5e557fc
commit 83d808e303
1 changed files with 7 additions and 2 deletions
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9
backend.py
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@ -189,8 +189,13 @@ class EventResource(BaseEvent):
buffer = float(req.params['buffer'])
else:
buffer = 1000
event_bbox = cur.mogrify(" AND ST_Intersects(geom, ST_Buffer(ST_SetSRID(ST_Scale(ST_LineFromEncodedPolyline(%s),0.1,0.1),4326)::geography, %s)::geometry) ",(req.params['polyline'], buffer)).decode("utf-8")
event_dist = cur.mogrify("ST_Length(ST_ShortestLine(geom, ST_SetSRID(ST_Scale(ST_LineFromEncodedPolyline(%s),0.1,0.1),4326))::geography)::integer as distance, ",(req.params['polyline'],)).decode("utf-8")
if 'polyline_precision' in req.params:
precision = int(req.params['polyline_precision'])
else:
precision = 5
# ST_Scale is a workaround to postgis bug not taking precision into account in ST_LineFromEncodedPolyline
event_bbox = cur.mogrify(" AND ST_Intersects(geom, ST_Buffer(ST_Scale(ST_LineFromEncodedPolyline(%s),1/10^(%s-5),1/10^(%s-5))::geography, %s)::geometry) ",(req.params['polyline'], precision, precision, buffer)).decode("utf-8")
event_dist = cur.mogrify("ST_Length(ST_ShortestLine(geom, ST_Scale(ST_LineFromEncodedPolyline(%s),1/10^(%s-5),1/10^(%s-5)))::geography)::integer as distance, ",(req.params['polyline'], precision, precision)).decode("utf-8")
else:
event_bbox = ""
event_dist = ""