"Graduated Symbol" symbology: wrong numeric ranges

[qgib]

Author Name: Maciej Sieczka - (Maciej Sieczka -)
Original Redmine Issue: 983

Redmine category:symbology
Assignee: nobody -

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There are following values in the numeric column of a vector layer: 0, 1, 2, 3.

Go to Layer Properties > Symbology > Graduated Symbol to build a legend for it.

If the number of classes is 1, QGIS creates the range as "0.999 - 3.001". Why is 0 omitted and why is max grater than 3? The range should be "0 - 3".

For 2 classes I get: "0.999 - 2.000" and "2.000 - 3.001". Besides wrong min and max like above, I think that "2.000" should not be included in both ranges. Moreover, as the input are integer numbers, decimal numbers should not be present - they suggest different numeric precision than the input data actually have.

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• nmb.tar.bz2 (Maciej Sieczka -)

[qgib]

Author Name: Jürgen Fischer (@jef-n)

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what data source does this apply to?

[qgib]

Author Name: Maciej Sieczka - (Maciej Sieczka -)

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Replying to [comment:1 jef]:

what data source does this apply to?

I tried [[PostGIS]] and Shapefile - the bug applies to both.

Check with the attached Shapefile first, then after importing it into [[PostGIS]] (thanks for fixing SPIT!!!). You should be a ble to reproduce the bug with either data source.

[qgib]

Author Name: Tim Sutton (Tim Sutton)

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Tested in SVN trunk f5a0a4c (SVN r9471) and graduations run from -0.001 to +4.001. Works for me, I'm closing this ticket, please reopen if problems persist.

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• status_id was changed from Open to Closed
• resolution was changed from to fixed

[qgib]

Author Name: Maciej Sieczka - (Maciej Sieczka -)

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This bug is only partialy fixed.

The attached Shapefile has the following values in the floating point column 'nmb': 0.0, 1.0, 2.0, 3.0.

Try to classify it with "graduated symbol", one class - the data range according to QGIS is '-0.001 - 4.001'. This exceeds the actual data range which is '0 - 4'.

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• status_id was changed from Closed to Feedback
• resolution was changed from fixed to

[qgib]

Author Name: Giovanni Manghi (@gioman)

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Tested now on QGIS 1.2 (rev. 10988) with the provided shapefile (one column, "nmb", with values 0,1,2,3,4).

with 1 classes and "mode" is "quantiles" qgis creates the range "0.000000 - 4.000000"

with 1 classes and "mode" is "equal interval" qgis creates the range "-0.001 - 4.001"

with 2 classes and "mode" is "quantiles" qgis creates the ranges "0.000000 - 2.000000" and "2.000000 - 4.000000"

with 2 classes and "mode" is "equal interval" qgis creates the ranges "-0.001 - 2.000" and "2.000 - 4.001"

I'm not sure the problem has been solved.

[qgib]

Author Name: Marco Hugentobler (@mhugent)

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Fixed in 6a9ae8f (SVN r10990)

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• resolution was changed from to fixed
• status_id was changed from Feedback to Closed