points in polygon: does not count points on boundaries

[qgib]

Author Name: alobo - (alobo -)
Original Redmine Issue: 5163
Affected QGIS version: 1.7.4
Redmine category:processing/qgis

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Results from points in polygon
are different than those obtained from R.
Results from qgis are always equal to or lower than
the number calculated by R.
Visual inspection indicates that only points on polygon boundaries
are affected.
In the attached layer quadratsnbpoints
nbp: calculated in R
PNTCNT: calculated by qgis

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• pointsingrid.zip (alobo -)

[qgib]

Author Name: cfarmer - (cfarmer -)

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This is because it isn't programmed to test for intersections :-p The tool checks for containment: It uses QgsGeometry.contains, rather than QgsGeometry.intersects. I suppose intersections would also be perfectly valid, but it is called 'points in polygon' :-p
I don't have a development environment set up at the moment, so can't fix/implement this right away - so will leave this ticket open. Any other developers want a quick fix? Just change line 143 in doPointsInPolygon from " if inGeom.contains(tmpGeom.asPoint()):" to " if inGeom.intersects(tmpGeom):".

Carson

[qgib]

Author Name: Alexander Bruy (@alexbruy)

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Fixed in changeset "9151fd583b5062a4e085bba70364cd3c0a0c4885".

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• status_id was changed from Open to Closed

[qgib]

Author Name: Alexander Bruy (@alexbruy)

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• resolution was changed from to fixed

[qgib]

Author Name: Giovanni Manghi (@gioman)

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• fixed_version_id was changed from 35 to Version 1.8.0

[qgib]

Author Name: Giovanni Manghi (@gioman)

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The "ftools" category is being removed from the tracker, changing the category of this ticket to "Processing/QGIS" to not leave the category orphaned.