[postgis-users] st_split

[Rémi Cura]

You may want to split not with point but with the projected point one line
(use http://postgis.refractions.net/docs/ST_ClosestPoint.html)
If it is not enough, you may want to translate all your geometries to
reduce the number of digits in coordinates.
Another possibility is to use ST_Snap to snap line to point (won't work the
other way)

Cheers,
Rémi-C


2013/10/28 Nicolas Ribot <nicolas.ribot at gmail.com>

> Hi,
>
> The points are not on the line, probably due to rounding errors.
>
> st_contains(line, point) returns false.
>
> Nicolas
>
> On 28 October 2013 18:07, franco base <frenk.calza at gmail.com> wrote:
> > Hi.
> > I have a set of linestring and point on linestring.
> > I want cut the linestring on the point.
> > I can have n points for one linestring,
> > so I use ST_Split
> > (insted of ST_Line_Interpolate_Point and ST_Line_Substring)
> > but it doesn't work.
> >
> > line;geom_line;point;geom_point
> >
> 7646;"0102000020BB0B000006000000A4703D0A471F37412D211F04AF335341FAEDEBE0491F3741325530C2AE335341BD5296014F1F37418FC2F578AE3353414694F606521F3741D2DEE07BAE3353412D211F74541F37418FC2F578AE33534123B9FC675020374112143FF6BC335341";11764;"0101000020BB0B00005713362F611F37410D996234AF335341"
> >
> 7646;"0102000020BB0B000006000000A4703D0A471F37412D211F04AF335341FAEDEBE0491F3741325530C2AE335341BD5296014F1F37418FC2F578AE3353414694F606521F3741D2DEE07BAE3353412D211F74541F37418FC2F578AE33534123B9FC675020374112143FF6BC335341";11769;"0101000020BB0B00005EF0DD584620374139BF2762BC335341"
> >
> 7646;"0102000020BB0B000006000000A4703D0A471F37412D211F04AF335341FAEDEBE0491F3741325530C2AE335341BD5296014F1F37418FC2F578AE3353414694F606521F3741D2DEE07BAE3353412D211F74541F37418FC2F578AE33534123B9FC675020374112143FF6BC335341";11762;"0101000020BB0B0000A5CBC785841F374156A2A33CB1335341"
> >
> > ST_GeometryType(St_Split(geom_line, geom_point))
> > give "ST_GeometryCollection"
> >
> > but
> >
> > (ST_Dump(ST_Split(geom_line, geom_point))).geom
> >
> > return only 3 linestring (one for record) and the geometry is egual to
> > geom_line
> >
> >
> > thanks.
> >
> > fb
> >
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