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 <andreaer...@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 > _______________________________________________ > Qgis-user mailing list > Qgis-user@lists.osgeo.org > List info: https://lists.osgeo.org/mailman/listinfo/qgis-user > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
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