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I have a vector layer in QGIS with 30000 points. I want to delete those with values lower than a specific value. I could not use filter in an edited layer, and I could not filter the layer after editing it.

What can I do?

  • 1
    You are probably working with shapefiles. Save your data to spatialite, and editing and filtering is possible. – AndreJ Sep 21 '17 at 15:26
  • Thanks, I tried but still can not edit and filtering at the same time. – Fernando Sep 21 '17 at 16:37
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you can do it by open attribute, then click 'select features using an expression' and then write down 'YOUR_VALUE_FIELD' < "YOUR_OPTIONAL_NUMBER". as the picture below :

instruction

if your field is a string type, you must change it to integers by doing the following :

  • ctrl + I
  • Create new field
  • to_int('YOUR_STRING_FIELD')

then it's good to go...

  • I assumed the user is new to Qgis... if not, try AndreJ solution... – Afshin Salehi Sep 21 '17 at 15:59
  • I do not understand, Select by expression does not work either. I can choose the criteria, but it does not select the points. What I did was filter, copy and paste the filtered points to a new layer. Thanks. – Fernando Sep 21 '17 at 16:47
  • I had some experience working with Esri's geodatabase files which couldn't be edited. I must export them in one of the supported files and then edit the exported. – Afshin Salehi Sep 21 '17 at 19:58
  • I have to say the most compatible extension for Qgis is the spatialite database and files. many tutorials are available on the net. remember creating a spatial index for each layer. This makes all tools operate fine without any errors. – Afshin Salehi Sep 21 '17 at 20:01

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