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I need to create a new shapefile from two existing shapefiles with QGIS. The original shapefiles are both for the US and contain the borders of congress districts in different years (the borders change over time). I would like to intersect these two shapefiles and save for every created subregion the ID of the polygon from the earlier congress and the ID of the polygon from the later congress.

I have tried with “Join attributes by location” but that does not give me the subregions as new polygons.

I would be very grateful for any help.

Best regards, Andreas

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I believe this is a duplicate of this existing question: gis.stackexchange.com/questions/18453/…. You'll need at least QGIS 1.8 to use the intersection tool. –  scw Jun 14 '13 at 7:05
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