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我有一个查询的工作,但想知道是否有一个更快,我可以使用较钝的窗体。我已经在几何体周围创建了一个边界框来缩小搜索范围,但对ST_Transforms的多次调用看起来很尴尬。顺便说一句:两条线(gg和gm)具有相同的点。POSTGIS SELECT optmization
由于提前,
-Matt
CREATE TABLE lines
(
line_id bigserial NOT NULL,
line_gm_bbox geometry,
line_gm_line geometry,
line_gg_line geography(LineString,4326),
)
WITH (OIDS=FALSE);
CREATE INDEX line_bbox_idx
ON lines
USING gist
(line_gm_bbox);
SELECT l.* FROM lines AS l WHERE l.line_gm_bbox && ST_Transform(ST_Buffer(ST_Transform(ST_GeomFromText('POINT(-71.44513306666667 42.7368536)',4326),3395), 2000), 4326)
AND ST_DWithin(l.line_gg_line, ST_GeomFromText('POINT(-71.44513306666667 42.7368536)',4326), 200);