Bug report #3132

Field calculator cannot calculates area of polygon

Added by dr - over 13 years ago. Updated over 12 years ago.

Status:Closed
Priority:Low
Assignee:Jürgen Fischer
Category:Vectors
Affected QGIS version:master Regression?:No
Operating System:All Easy fix?:No
Pull Request or Patch supplied:No Resolution:worksforme
Crashes QGIS or corrupts data:No Copied to github as #:13192

Description

I have vector layer, which contains one polygon. When I try to calculate their area with field calculator I get NULL result, but ftools Export/Add geometry columns tool works fine. My layer in attachment.

err.zip (44.6 KB) dr -, 2010-10-17 04:23 PM

Related issues

Related to QGIS Application - Bug report #4622: Labelling expression: toint() produces negative values Closed 2011-12-09

Associated revisions

Revision afc78ee2
Added by Jürgen Fischer over 13 years ago

fix #3132

git-svn-id: http://svn.osgeo.org/qgis/trunk/qgis@14395 c8812cc2-4d05-0410-92ff-de0c093fc19c

Revision 650abbb9
Added by Jürgen Fischer over 13 years ago

fix #3132

git-svn-id: http://svn.osgeo.org/qgis/trunk@14395 c8812cc2-4d05-0410-92ff-de0c093fc19c

History

#1 Updated by Jürgen Fischer over 13 years ago

  • Status changed from Open to Closed
  • Resolution set to fixed

fixed in 650abbb9 (SVN r14396).

#2 Updated by dr - over 13 years ago

  • Status changed from Closed to Feedback
  • Resolution deleted (fixed)

Now area of this polygon is negative value.

#3 Updated by Jürgen Fischer over 13 years ago

um, I get 2849751229.32861 - just like in the identify results. And the earlier problem wasn't that the area wasn't calculated, but only that the attribute table didn't show the updated result.

#4 Updated by Maxim Dubinin over 13 years ago

0c31b555 (SVN r14411), tried new and existing AREA field - all seems normal (result is correct)

#5 Updated by Maxim Dubinin over 13 years ago

I'm afraid I have to take it back, I do have negatives too, please check this video:
http://screencast.com/t/58exsAG3vz

#6 Updated by Jürgen Fischer over 13 years ago

  • Status changed from Feedback to Closed
  • Resolution set to fixed

That's what you get when you try to save 2849751229.32861 in a 32bit integer. Use a real field.

#7 Updated by dr - over 13 years ago

  • Resolution deleted (fixed)
  • Status changed from Closed to Feedback

I've tried use real field but get the same negative result.

#8 Updated by Paolo Cavallini about 13 years ago

Is this still true?

#9 Updated by Alexander Bruy about 13 years ago

  • Status changed from Feedback to Closed
  • Resolution set to fixed

Seems fixed for now (tested with )

#10 Updated by dr - about 13 years ago

  • Status changed from Closed to Feedback
  • Resolution deleted (fixed)

Bug still present at 95af577b (SVN r15307).

#11 Updated by Borys Jurgiel about 13 years ago

I can confirm. Creating integer as well as floating point fails. Right after calculating you can see proper values (as they're not updated from layer), but after layer save they becomes negative.

However, updating the existing AREA field works fine.

#12 Updated by Borys Jurgiel about 13 years ago

(tested on Ubuntu)

#13 Updated by Enrico Fiore about 13 years ago

Replying to [comment:11 borysiasty]:

I can confirm. Creating integer as well as floating point fails.

For floating values the problem happen if you assign precision = 0, otherwise area is correct.

#14 Updated by Giovanni Manghi over 12 years ago

  • Target version changed from Version 1.7.0 to Version 1.7.4

#15 Updated by Giovanni Manghi over 12 years ago

  • Affected QGIS version set to master
  • Status changed from Feedback to Closed
  • Resolution set to worksforme
  • Pull Request or Patch supplied set to No
  • Crashes QGIS or corrupts data set to No

Seems to work fine now. Reopen if necessary.

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