[postgis-users] Split / Divide linestring into parts / segments ?

[Simon Greener]

Grant,

Are you after something like this:

SELECT ST_AsText(ST_Line_SubString(the_geom,
                                    ((g::float-1.0) / 30.0),
                                    (g::float/30::float) )) as segment,
        ST_Length(ST_Line_SubString(the_geom,
                                    ((g::float-1.0) / 30.0),
                                    (g::float/30::float) )) as length,
        g as segment_number,
        ((g::float-1.0) / 30.0) as start,
        (g::float/30::float)    as end
   FROM (select ST_GeomFromText('LINESTRING(748130 2919491,747979 2919630,747895 2919705)') as the_geom) as l,
         generate_series(1,30,1) as g;

regards
Simon
On Wed, 14 Oct 2009 17:18:53 +1100, Grant Masan <grant.massan at gmail.com> wrote:

> Hi,
>
> Thanks Regina ! Good case but it is not helping me in my case. So if I can
> make this more clear to everybody I need to divide/split one linestring to
> 30 different pieces. So I can see where other linestrings has intersected
> this one linestring. Like how many linestrings has crossed the "door" in
> section 1 or 3 and so on...
>
>                                linestring "door"
>
> <----1------><-----2-----><------3------><-------5-----><-----6-------> and
> so on ...
>


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