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I have a map defined by two seperate reference systems: one is a standard grid coordinate system, the other a series of irregualar polygons. I want to find which polygon each grid square overlays, and to do this I think I need to add my grid as a polygon layer where each grid square is a polygon. How do I do this? I have a .csv file in which I have defined as seperate columns each vertex of each grid cell. I have also managed to import this into QGIS as a series of point vectors (both .csv and as a shapefile) and convert this into a grid of lines. But I can't work out from here how to turn either the grid, or the original .csv file, into polygons.

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    Did you already try using the "Lines to Polygons" tool under Vector > Geometry Tools? – TobsenB Mar 8 '16 at 10:57
  • Yes, I think what it does is convert each of the lines to a line shaped polygon. The output in anycase is an identical grid overlaying my lines. – elephants_neve_forget Mar 8 '16 at 16:54

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