Pedro,
Try using st_intersects instead of ST_within. In general I think it performs
better than within and for point in poly will be just as good.
Yah Guido's suggestion would be at best give same timing since ST_Within,
ST_Intersects have an implicit && call in them so they can limit the number of
more painful _ST_Within, _ST_Intersects checks they actually need to do.
Hope that helps,
Regina
-----Original Message-----
From: [EMAIL PROTECTED] on behalf of Pedro Doria Meunier
Sent: Sat 8/30/2008 8:16 AM
To: PostGIS Users Discussion
Subject: RE: [postgis-users] st_within too slow?
Dear Guido,
Thanks for replying.
Your suggested mod actually worsens the performance by another ~15-20ms
Best regards,
--
Pedro Doria Meunier <[EMAIL PROTECTED]>
> Pedro,
>
> Try this instead:
>
> SELECT road_network, toponymy FROM maps AS m WHERE m.b_box &&
> geomfromtext('POINT($lon $lat)',4326) and
> st_within(geomfromtext('POINT($lon $lat)',4326), m.b_box)
>
> of course, if you already know that the point is in Portugal,
> you could do:
>
> SELECT road_network, toponymy FROM maps AS m WHERE
> m.country = 'PT' and
> m.b_box && geomfromtext('POINT($lon $lat)',4326)
>
> (assuming that the maps table has the 'country' column with
> country names).
>
> GL
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