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This is a question about QGIS: I am working locally (no connection to servers or databases) with some maps data which I have imported as a non-visible CSV layer. These were merged against some census data and a derived variable (proportion) was created using the field calculator. I used this to shade the census tracts in a choropleth. I saved my session and called it a day.

When I came back to reload my session, all my previous layers still existed, and the geocoded points remained. However, the choropleth shadings were absent. I opened up the field calculator to look at those data and did not see my derived field. When I tried to regenerate this value, the field calculator throws an error that the field name is not unique. But still I cannot find the field.

Is there a way for me to recover this field?

  • What GIS software does this field calculator come from? – PolyGeo Aug 3 '17 at 20:34
  • @PolyGeo sorry, QGIS: I edited the tags/title/info – AdamO Aug 3 '17 at 20:41
  • Now its scope just needs to be reduced to a single question as per the Tour. – PolyGeo Aug 3 '17 at 20:46

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