[Qgis-user] SPLIT POLYGONS INTO 3 PARTS (similar size)

[Ujaval Gandhi]

I ended up writing a blog post with step-by-step instructions on how to do
this. You may find it useful
https://spatialthoughts.com/2021/06/12/split-polygons-qgis/
[image: Logo] <https://spatialthoughts.com/>
Ujaval Gandhi
Spatial Thoughts
mobile: +91-8095684687
email: ujaval at spatialthoughts.com
[image: LinkedIn icon] <https://www.linkedin.com/in/spatialthoughts/>  [image:
Twitter icon] <https://twitter.com/spatialthoughts>



On Thu, Jun 10, 2021 at 12:34 PM Ujaval Gandhi <ujaval at spatialthoughts.com>
wrote:

> Hi Azzurra,
>
> QGIS Processing Algorithms have an 'Iterate' feature that can be used to
> run an algorithm on all features of the layer. (see attached screenshot) I
> built a QGIS Processing Model that splits a polygon into N parts. You can
> load the model using 'Add Model to Toolbox' from the Processing Toolbox
> menu and run the 'Split Polygon' algorithm with 'Iterator' mode to run it
> 200 times - one for each of your polygons. You will get 200 new layers
> which can be merged into 1 using the 'Merge Vector Layer' tool. I tested it
> on the US States dataset and it works well.
>
>
> [image: Logo] <https://spatialthoughts.com/>
> Ujaval Gandhi
> Spatial Thoughts
> mobile: +91-8095684687
> email: ujaval at spatialthoughts.com
> [image: LinkedIn icon] <https://www.linkedin.com/in/spatialthoughts/>  [image:
> Twitter icon] <https://twitter.com/spatialthoughts>
>
>
>
> On Thu, Jun 10, 2021 at 5:01 AM Azzurra Lentini <azzurralentini at gmail.com>
> wrote:
>
>> Hi List, I ask you  again the same question  I asked you days ago.
>> I have several polygons - around 200-  (all different shapes and not
>> regular geometry) and I need to split every single polygon into 3 parts
>> of similar size.
>> I have tried with *Split polygons* but it is working very well only with
>> regular geometries (square, rectangle etc.) and so I can not use it in this
>> case.
>> I have tried  also your suggestions (generate points, kclustering and
>> voronoi polygons):https://gis.stackexchange.com/questions/321021/how-to-
>> split-polygon-into-equal-area-polygons-in-qgis-3 and
>> https://blog.cleverelephant.ca/2018/06/polygon-splitting.html
>> but I am not able to do it to all 200 polygons at once.. I can do it only
>> polygon by polygon..
>>
>> do you have other suggestions? thanks AL
>>
>> On Wed, 19 May 2021 at 15:49, Azzurra Lentini <azzurralentini at gmail.com>
>> wrote:
>>
>>> Dear List,
>>> please I would like to have any suggestion regarding this topic: I have
>>> several polygons (all different shapes and not regular geometry) and I need
>>> to split every single polygon into 3 parts of similar size.
>>> I have tried with *Split polygons* but it is working very well only
>>> with regular geometries (square, rectangle etc.) and so I can not use it in
>>> this case.
>>>
>>> Do you have any suggestions?
>>>
>>> THANK YOU, AZZURRA
>>> --
>>> Adjunct Professor University "Roma Tre"
>>> Gis Applied for Environmental studies
>>> Risk modelling & Hydrogeology
>>> Consultant DFID-UK, United Nations, EU projects
>>> AZZURRA LENTINI
>>> ++++++++++++++++++++++++++
>>> Italy Mobile Tel.: **(39) 338 24 40 676
>>> ++++++++++++++++++++++++++
>>> SKYPE azzurrahydro
>>> ++++++++++++++++++++++++++
>>>
>>> *azzurralentini at gmail.com <azzurralentini at gmail.com>*
>>>
>>> *azzurra.lentini at uniroma3.it <azzurra.lentini at uniroma3.it> *
>>> ++++++++++++++++++++++++++
>>> *Par respect pour l'environnement,*
>>>
>>> *n'imprimez ce mail qu'en cas d'absolue nécessité*
>>>
>>>
>>>
>>>
>>>
>>>
>>
>> --
>> Adjunct Professor University "Roma Tre"
>> Gis Applied for Environmental studies
>> Risk modelling & Hydrogeology
>> Consultant DFID-UK, United Nations, EU projects
>> AZZURRA LENTINI
>> ++++++++++++++++++++++++++
>> Italy Mobile Tel.: **(39) 338 24 40 676
>> ++++++++++++++++++++++++++
>> SKYPE azzurrahydro
>> ++++++++++++++++++++++++++
>>
>> *azzurralentini at gmail.com <azzurralentini at gmail.com>*
>>
>> *azzurra.lentini at uniroma3.it <azzurra.lentini at uniroma3.it> *
>> ++++++++++++++++++++++++++
>> *Par respect pour l'environnement,*
>>
>> *n'imprimez ce mail qu'en cas d'absolue nécessité*
>>
>>
>>
>>
>>
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