Hi Matt.

I think what you want may be:

line_interpolate_point(the_geom,0.5)

(or ST_line_interpolate_point(the_geom,0.5) depending on your Postgis
version)

where the_geom is a linestring and 0.5 means half of the total 2d length of
the linestring.

You can reed more details in the documentation:

http://postgis.refractions.net/docs/ch06.html#line_interpolate_point

Rodrigo

On 6/21/07, Matt Doughty <[EMAIL PROTECTED]> wrote:

 Hi List,



Is there a function in PostGIS that finds the midpoint of a line?



Matt







Matt Doughty

  GEOGRAMA S.L.

Tel.:  +34 945 13 13 72    652 77 14 15

Fax: +34 945 23 03 40

www.geograma.com





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