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I'm recently experimenting with QGIS at work (a poor charity who is struggling along with MapInfo v8).

As all our layers are in .TAB format and I was wondering if you can use the geoprocessing tools to analyse this data in QGIS or if you have to convert to .SHP first?

Also, if I was being difficult, could I use the intersect tool to see how much of a .SHP polygon was inside a .TAB polygon?

I didn't work when I tried, but this may be due to me missing something else.

  • In which way it did not work? – user30184 Oct 22 '16 at 12:54
  • it works fine for me, which Qgis are you using? – user85037 Oct 24 '16 at 20:52
  • It was v2.14. Looking into it a bit further, I think it may have been because the projections were different. I had OTF on. (p.s. sorry for the delayed reply - I went on my hols and forgot about GIS for a while!). – Mat G Nov 25 '16 at 18:46
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Yes, you should be able to use the majority of geoprocessing tools on .tab files. I just tested running the Intersection tool with the .tab file as input layer and the polygon shapefile as the intersect layer:

Result

You can then use the Field Calculator on the output layer and use an expression like $area to calculate how much of the .shp file was inside the .tab file.

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    Thanks for your detailed reply. I still couldn't get the thing to work but I think that may be due to differing projections rather than the different formats. – Mat G Nov 25 '16 at 18:50
  • @MatG - Most welcome! Yes, you always have to make sure that when you're geospatially analysing one layer with another, they all must be in the same CRS ;) – Joseph Nov 28 '16 at 13:59

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