Re: [postgis-users] point_ops with GiST PostGIS Spatial Index

Create the gist index on table containing points using the following syntax:

CREATE INDEX <index name> ON <table name> USING GIST (<geometry column name>);

After the index is created use the criteria st_contains(polygon,point) in the where clause of select statement:

Select * from <tablename> where st_contains(polygon, point) ;

Regards,

Kedar Tambade

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From: postgis-users-bounces(at)lists(dot)osgeo(dot)org [mailto:postgis-users-bounces(at)lists(dot)osgeo(dot)org] On Behalf Of BladeOfLight16
Sent: Wednesday, June 05, 2013 2:29 PM
To: PostGIS Users Discussion; pgsql-general(at)postgresql(dot)org
Subject: [postgis-users] point_ops with GiST PostGIS Spatial Index

I posted this question on StackOverflow, and the only person to answer recommended I ask these lists for more details and link to the question:
http://stackoverflow.com/questions/16927331/postgresql-point-ops-with-gist-postgis-spatial-index

My question is:

The 9.0 release notes<http://www.postgresql.org/docs/9.2/static/release-9-0.html> for PostgreSQL states the following change:

Add point_ops operator class for GiST (Teodor Sigaev)

This feature permits GiST indexing of point columns. The index can be used for several types of queries such as point <@ polygon (point is in polygon). This should make many PostGIS queries faster.

I have a very large table (millions of rows) with a GEOMETRY(POINT,[SRID]) column that I sometimes compare to polygons. Do I need to do anything to enable this when creating the index? Do I have to use the operator indicated, or would this work with ST_Contains<http://postgis.refractions.net/docs/ST_Contains.html> which uses && internally?
Thanks for any help.