[Qgis-user] Line dissolve

[Nicolas Cadieux]

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 <njacadieux.gitlab at gmail.com> a écrit :
> 
> 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 simple linestrings and to merged them into a single multilinestring if they share a node or share and object that shares a node.  So, for example, if you had two cities separated by a river (and there was no way to cross the river), all the roads would be merged in two objects, one for each city.
> 
> 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
> 
> I will share a file with and example of what I am looking for.
> 
> Nicolas Cadieux
> https://gitlab.com/njacadieux
> 
>>> Le 29 août 2021 à 17:12, Andrea Giudiceandrea <andreaerdna at libero.it> a écrit :
>>> 
>> 
>>> 
>>> 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 MultiLineString geometry, where any connected LineStrings from the input geometry have been merged into a single linestring. This function will return NULL if passed a geometry which is not a LineString/MultiLineString.
>> https://docs.qgis.org/3.16/en/docs/user_manual/working_with_vector/functions_list.html#line-merge
>> 
>> Regards.
>> 
>> Andrea Giudiceandrea
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