[postgis-users] location of point on linestring

[strk at refractions.net]

The head branch contains line_locate_point(linestring, point).
It should be exactly what you're looking for.

--strk;

On Thu, Dec 08, 2005 at 04:03:43PM +0100, Alex Mayrhofer wrote:
> Hi,
> 
> I have a LINESTRING and a POINT which lies on (or "pretty close", see 
> below*) the LINESTRING.
> 
> I need to know the relative position of the POINT on the LINESTRING 
> (essentially the reverse of line_interpolate_point()).
> 
> Any idea how to do this?
> 
> thanks,
> 
> Alex
> ----
> * the POINT _should_ be exactly on the LINESTRING because it comes from an 
> intersect() operation.
> 
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