I am using QGIS 2.18.10. I am working in UTM Zone 30 WGS 84.

I have created a vector grid 1000km X 1000 km using the Vector>Research Tools> Create Grid

I have another shapefile which has point data in it.

I am trying to use: Vector>Counts point in polygons, and selecting the correct dataset.

However it is giving me an error: "unknown see log for more details". But that is in the log. So I can't figure out why.

What might I be doing wrong?

  • Could you share both shapefiles? – Mazu_R Aug 9 '17 at 16:06
  • Add the log panel to get more detail on the issue. You're looking at the tool log. Then provide more detail – Liam G Aug 9 '17 at 20:12
  • A grid 1000km X 1000 km is huge and, depending on latitude, it could occupy between 2 (equator) and more than 4 (high latitudes) UTM zones. – xunilk Aug 10 '17 at 3:04
  • Do both datasets have the same CRS? Does your grid have valid geometry? – mixedbredie Aug 10 '17 at 9:42

I think that you forget to choose the "Grid Extent" (It should be the Canvas extent or Layer)

1 - Vector> Research Tools> Vector Grid

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2 - Vector> Analysis Tools> Count points in polygons

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