RFCL-PolygonDivider
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jonnyhuck
Polygon divider creates less equal parts than asked
I've installed QGIS 3.16 for Windows. I digitised a polygon layer (limits of a city) and used the Polygon divider plugin to divide it in 10 equal parts (polygons).
However, as a result, it created only 9 equally divided polygons. (When I tested it, asking for 9 equal parts, it did create 9 polygons (2 of them weren' t equal though). But when I tried for an 8 equal parts division, it again gave 7 (ie. minus 1) polygons). So it seems that for a number of divisions it does the job, for others not.
Could you please enlighten me? Thank you in advance!
Unfortunately, due to the complexity of what it is doing, its performance can vary depending on the geometry of the shape that you are trying to subdivide - though it would more usually have one too many polygons (due to an unintentional offcut - normally a tiny sliver) rather than one too few - could you send a copy of the data so I can try and reproduce it please?
An easy fix might be to simply change the direction of cut - it will perform differently in each direction, so that might resolve it for you!
GLADLY, THANK YOU!!! It is for an urban project, in Greece, ultimately, I need to create the centroids of these 10 polygons. Irene
Unfortunately, due to the complexity of what it is doing, its performance can vary depending on the geometry of the shape that you are trying to subdivide - though it would more usually have one too many polygons (due to an unintentional offcut - normally a tiny sliver) rather than one too few - could you send a copy of the data so I can try and reproduce it please?
An easy fix might be to simply change the direction of cut - it will perform differently in each direction, so that might resolve it for you!
Thank you very much for taking the trouble and sending me your reflections. I did try a few alternatives and realised that maybe the shape of my polygon was indeed quite complex and irregular. So, I digitised it again but (quite) more roughly and yes, the plugin worked properly and effectively. However, since I really need it for an urban planning project (the polygon is actually the limits of a medium sized city in Greece, EU, where I need to create the respective centroids), I will respond to your kind suggestion and send you the original polygon. Looking forward to hearing from you, Irene PS. I think I should remind you I try to divide it in 10 polygons.
On Tue, Dec 1, 2020 at 6:40 PM Jonny Huck [email protected] wrote:
Unfortunately, due to the complexity of what it is doing, its performance can vary depending on the geometry of the shape that you are trying to subdivide - though it would more usually have one too many polygons (due to an unintentional offcut - normally a tiny sliver) rather than one too few - could you send a copy of the data so I can try and reproduce it please?
An easy fix might be to simply change the direction of cut - it will perform differently in each direction, so that might resolve it for you!
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NB: I have plans to change the process that it uses when it struggles to find a division, so that it better preserves the size/number of divisions