[Qgis-user] RES: Trouble with select by location between point and line layer

[Alexandre Neto]

In a segment it's quite dificult to intersect a point in line. Unless you
have somekind of tolerance. I believe ArcGIS have an automatic tolerance
set.

If you want to make sure that the points REALLY intersect the line, you
need extra nodes on your line. I would use Postgis St_Snap for that.

Em dom, 27 de set de 2015 às 22:02, João Henrique Carneiro <
jhcarneiro at axaeng.com> escreveu:

> Hello Havard,
> THanks for responding.
>
> I cannot have any error. My client will be checking for topological
> errors. In ArcGIS these points are detected by “Select by Location” but not
> be QGIS.
>
> Best regards,
> João Carneiro
> > On Sep 27, 2015, at 5:35 PM, Håvard Tveite <havard.tveite at nmbu.no>
> wrote:
> >
> > A tolerance value would probably be needed in the general
> > case.
> > Have you tested with horizontal or vertical lines?
> >
> > Håvard Tveite
> >
> > On 25. sep. 2015 21:53, João Carneiro wrote:
> >> Updating the information  below –
> >>
> >> I have checked that select by location only selects the points that are
> >> snapped to a vertice of a sg_line, but not snapped to segments. Is this
> >> working as expected, or do we have a bug here?
> >>
> >> Att.,
> >>
> >> João Carneiro
> >>
> >> *De:*João Carneiro [mailto:jhcarneiro at axaeng.com]
> >> *Enviada em:* sexta-feira, 25 de setembro de 2015 14:40
> >> *Para:* 'qgis-user at lists.osgeo.org'
> >> *Assunto:* Trouble with select by location between point and line layer
> >>
> >> Hello,
> >>
> >> Has anyone had the following problems?
> >>
> >> I am trying to detect topological problems in my data between two
> >> classes called sg_point and sg_line. Our topological rule is that
> >> sg_point MUST be snapped to sg_line.
> >>
> >> I imagine that the best way to do this is by using “Select By Location”
> >> and select all points that intersect the line. Unfortunately this does
> >> not work, and neither does trying the opposite selection. Trying to
> >> select all the points that don’t intersect the line gives me 100% of the
> >> points even if there were some points that were correctly snapped to the
> >> line beforehand.
> >>
> >> I have not managed to select only the points that don’t intersect the
> >> line or only the points that do intersect the line.
> >>
> >> What am I doing wrong?
> >>
> >> Thanks for any  help.
> >>
> >> Best regards,
> >>
> >> João Carneiro
> >>
> >>
> >>
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