6

I am using the QGIS (2.8.1) Voronoi Polygons Algorithm on a point shapefile. See image below, the red triangles are the points I am using. The resulting polygons miss a part (around HP87).

Any ideas why?

Resulting voronoi polygons

Here is some example data (EPSG:2154) that reproduces the error (excluding point A):

X,Y,NAME
816682.58,6391443.637,A
820180.458,6391708.558,B
821325.8429,6394449.982,C
822550.1316,6397547.124,D
Improve this question
4
  • 3
    I see this weird phenomena in QGIS 2.18.16, with QGIS geoalgorithm and v.voronoi. (Potentially related to an unanswered question ). They seem to ignore outmost point. SAGA Thiessen polygons is unaffected...
    – Kazuhito
    Commented Feb 20, 2018 at 16:23
  • 1
    Can you provide a sample data?
    – Alexandre Neto
    Commented Feb 20, 2018 at 16:58
  • @AlexandreNeto A sample data was added. Will you give it a go? (I am testing it with various buffer region. It behaves strange when the buffer exceeds approx. 9 ~10.)
    – Kazuhito
    Commented Feb 22, 2018 at 14:47
  • 1
    There were several bugs in the QGIS Voronoi code. Should be fixed in QGIS 3.2.2. Could you try it?
    – Håvard Tveite
    Commented Aug 25, 2018 at 19:29

1 Answer 1

Reset to default
1

I've tested in QGIS with 2 different tools. The grass v.voronoi and the internal voronoi.

From QGIS the v.voronoi doesn't work properly (it lacks polygons in my case): enter image description here

Howerver the voronoi tool seems to work properly: enter image description here

Here is my config: enter image description here

Improve this answer

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.