[postgis-users] match line with road segment

[Paragon Corporation]

You may be better off snapping the points to the line first before you do a
make line.  Take a look at Paul's blog entry.  


http://blog.cleverelephant.ca/2008/04/snapping-points-in-postgis.html

Sounds similar to what you are trying to do.

Hope that helps,
Regina

 

-----Original Message-----
From: postgis-users-bounces at postgis.refractions.net
[mailto:postgis-users-bounces at postgis.refractions.net] On Behalf Of
searchelite
Sent: Thursday, July 17, 2008 5:34 AM
To: postgis-users at postgis.refractions.net
Subject: Re: [postgis-users] match line with road segment



Stephen Woodbridge wrote:
> 
> You can buffer the line and see which segments fall inside the buffer.
> 
> select * from roads
>   where ST_Contains(the_geom, ST_makeline(gps_points));
> 
> -Steve
> 

thank you for the reply..can you be more detail please..i've tried your
suggestion but it returned no record.

I create a simple illustration below.. the green line is the record from
road table, and the red line is the route table generated from
ST_Makeline(gps_points), I want to make the red line snap into the road so
it become the route

http://www.nabble.com/file/p18504794/untitled.jpg 

Thank you in advance

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