Hi Harrissou,
Turn out I had a float point error problem with the distance matrix tool
that indicated I had no disconnected lines in my network. The distance
matrix tool reports 0 distance when the distance is around or below the
10th decimal point. I have fixed the problem and dissolve
Thanks!
Very informative and useful. I will have a look.
Nicolas Cadieux
https://gitlab.com/njacadieux
> Le 1 sept. 2021 à 03:33, Andrea Giudiceandrea a écrit
> :
>
> Nicolas Cadieux Mon, 30 Aug 2021 03:56:22 -0700
>> This post explains what I would like. It offer a QGIS 2 script that
Nicolas Cadieux Mon, 30 Aug 2021 03:56:22 -0700
This post explains what I would like. It offer a QGIS 2 script that could
help.
https://gis.stackexchange.com/questions/198317/join-merge-lines-that-touch-and-intersect-in-qgis
Hi Nicolas,
I've also successfully ported that script to QGSI 3 as
Hi,
I will look at the wkt output but it seems that with lines, dissolve will just
create a single huge multiline. The multi part to single part will just split
it back up. I suspect that dissolve only deals with common border in polygones
and not line ends. Will test tomorrow to figure out
Hi,
> That does not work with lines unfortunately. I tried multiple times with
different combinations. It works with polygons when common borders need to
be dissolved.
Nicolas, can you elaborate a bit more on the issues you have with the
"Dissolve + Multipart to singleparts" solution I provided
Nicolas Cadieux Mon, 30 Aug 2021 04:27:27 -0700
This is the plugin I was referring to. I don’t see it in the current plugins
(experimental turned on) so I figured it’s QGIS 2 only.
https://github.com/ArMoraer/QGISMergeLines
Hi Nicolas,
I've ported that plugin to QGIS3.
You could download
Thanks Charles,
This will be very useful. Nice to know I'am not the only one going crazy
with this!!!
Nicolas
On 2021-08-30 4:42 p.m., Charles Dixon-Paver wrote:
I thought this would be easily solved with an expression but sadly I
haven't been able to get reliable results at all.
My first
I thought this would be easily solved with an expression but sadly I
haven't been able to get reliable results at all.
My first thought was
collect($geometry,filter:=intersects($geometry,geometry(@parent))) and when
that didn't work I tried various aggregates and union operations to no
avail.
Hi,
Seems like the plugin is available so I will try it out. The ability to create
multi-linestring out of any touching lines (touch here means intersects at the
first or last node) would be nice to have it if I can include it in a model.
My goal is for this model to work for anyone with a
Hi Andrea,
That is great news. It may work for me in certain conditions. Will the plugin
pop up in processing? It would be nice to include it in the QGIS plugin
directory so that more people have access to it.
Nicolas Cadieux
https://gitlab.com/njacadieux
> Le 30 août 2021 à 15:08, Andrea
I looked at the source for this plug-in and as far as I can tell it
only merges lines that meet at endpoints. It ignores multi-lines,
and only creates linestrings, so there are no vertices of degree
>2 (ie, no junctions/forks). Also, the plug-in doesn't look for
Hi,
This is the plugin I was referring to. I don’t see it in the current plugins
(experimental turned on) so I figured it’s QGIS 2 only.
https://github.com/ArMoraer/QGISMergeLines
Nicolas Cadieux
https://gitlab.com/njacadieux
> Le 30 août 2021 à 06:56, Nicolas Cadieux a
> écrit :
>
> Hi,
Hi,
Thanks for the tip. I will play with the aggregate function.
My goal is not to used the snap as I am trying to identify groups of connected
lines in order to find the nodes that need to be snapped. The goal of my
models is to find almost every possible linear network error that would
Hi,
Thanks for the info. There was also a line_merge (or merge line) plugin. The
problem with the function that you are indicating is that it take a single
Multilinestring and create a simple linestring if the ends are connected. What
I am looking for is a way to select a file made of
Nicolas Cadieux Sun, 29 Aug 2021 08:18:08 -0700
I did see a merge function but did not find the line_merge plugin in
the repository.
Hi Nicolas,
"line_merge" is not a plugin. It is a function available in QGIS
expression / field calculator:
14.3.13.53. line_merge
Returns a LineString or
Hi Nicolas, I would urge you to try again as I was sure this would work and
when I tested it I had no issues (using freshly digitized data). Maybe you
need to run a snapping operation first?
One issue is that intersecting lines may break your ability to retrieve
attributes with aggregates. For
Hi,
Yes, Harrissou,
That does not work with lines unfortunately. I tried multiple times with
different combinations. It works with polygons when common borders need to be
dissolved. I did see a merge function but did not find the line_merge plugin in
the repository. I figured it was QGIS2
Hi Nicolas,
What about using "Dissolve" and then "multiparts to singleparts"...
There's also the line_merge function, if you want to go the expression route.
Regards,
Harrissou
Le 29 août 2021 05:26:24 GMT+02:00, Nicolas Cadieux
a écrit :
>Hi,
>
>Just to clarify, I have no attribute to
Hi,
Just to clarify, I have no attribute to dissolve the lines on… so If you have
as easy way to create an attribute list of all connected lines groups, I would
also appreciate it. This is easy in strait python but I am making a model and
trying to rely on existing algorithms.
Thanks!
Hi,
Is there an easy way, in processing, to dissolve lines that are touching?
Alternative, can I create a multilinestring with all the lines that are
touching? Seems this should be a basic tool to have in QGIS…
Nicolas Cadieux
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