[postgis-users] MakeLine question

Pedro Doria Meunier pdoria at netmadeira.com
Mon Nov 27 06:04:48 PST 2006

Hey Curtis,


Should your points contain a timestamp field you might try to order by it


Pedro Doria Meunier

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From: postgis-users-bounces at postgis.refractions.net
[mailto:postgis-users-bounces at postgis.refractions.net] On Behalf Of Curtis
W. Ruck
Sent: segunda-feira, 27 de Novembro de 2006 13:48
To: postgis-users at postgis.refractions.net
Subject: [postgis-users] MakeLine question


I have a table with gps tracks stored as points, each point being one data
record for every second.

I am trying to write a view which generates a polyline for each track.  I
know I need to "select MakeLine(the_geom) from track_log" but the postgis
documentation suggests "You might want to use a subselect to order points
before feeding them to this aggregate."

Does anyone have an example of how to do this, the postgres documentation
doesn't show an example of using a subquery in the SELECT list portion of
the query.


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