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List: postgis-users
Subject: Re: [postgis-users] spatial analysis - contains
From: maplabs () light42 ! com
Date: 2011-04-25 19:57:36
Message-ID: 20110425155736.hcoqm2bg2884kkw4 () webmail ! light42 ! com
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>
> From: shreyes shiv <shivshreyes@gmail.com>
> Subject: [postgis-users] spatial analysis - contains
>
> I have two shape files loaded onto Postgis. Both are of the same spatial
> extent.
> I wan to know wat all polygons of one shape file lies in the polygon of the
> other shape file. How to do u i write the query for this.
> Please help
>
Say there are two tables from the Natural Earth data set, found at
http://www.naturalearthdata.com/
10m_lakes
10m_admin_1_states_provinces
Say you want to find all lakes that occur in a single state/province
called "California"
SELECT
lakes.name1
FROM
"10m_lakes" as lakes,
"10m_admin_1_states_provinces" as provs
WHERE
st_contains( provs.the_geom, lakes.the_geom) AND
provs.name_1 = 'California'
Is that what you were asking?
==
Brian Hamlin
planetwork.net
OSGEo California Chapter
(415) 717-4462 cell
> -- shreyes shiv
> email: shivshreyes@gmail.com
> phone: 9557975780
> IIRS(Indian Institute of Remote Sensing)
> No. 4, Kalidas Road, Dehradun-248001, Uttarakhand, India
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