[Qgis-user] plugin to find boundaries around points

[Havard Tveite]

Assuming that the point layer has an attribute that identifies
the district, I suggest that you first create Voronoi polygons
for the point layer, and then dissolve the Voronoi polygons based
on the attribute that identifies the district.
Both these functions can be found in the Processing toolbox.
The QGIS Voronoi algorithm was fixed recently, so if you do not
have the latest QGIS version you should use v.voronoi (GRASS).

Håvard

On 09.12.2018 18:35, Holly Allen wrote:
> I've stumbled onto QGIS through a work project, and have a specific 
> problem I'm trying to solve. We have a set of around 5000 locations 
> which are broken up into about 500 districts. We'd like to produce a map 
> of polygons representing the districts, and I would really, really like 
> to not do that by hand if I can.
> 
> I've poked around in QGIS a bit (mostly 3.4.2, but I also installed the 
> latest 2.x version briefly to check it out) and worked through the list 
> of plugins available, and I don't see a way to auto-generate boundaries 
> between groups of points. I am about to write the code myself, but 
> wanted to ask the group whether I'm just missing something obvious. 
> Please point me to anything I'm missing! Since I haven't done anything 
> in this field before, I may simply not be searching for the right terms. 
> Bonus points if I can take the resulting boundaries and have them snap 
> to state boundaries (in another layer) wherever the state boundaries 
> happen to fall between the groups.
> 
> Thanks,
> Holly
> 
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