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I have two polygon shapefiles. One is post codes, the other is provinces (in China). I'd like to add a "Province" field to the post code database (i.e. DBF file). This field would indicate the province for each post code. Note - post codes never cross province boundaries.

How would I do this? I'm using QGIS.

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I would probably do the following:

  1. Vector > Geometry Tools > Polygon Centroids... on your Province shapefile.
  2. MMQGIS > Combine > Spatial Join on your Postcode and Province centroid layers and select which fields you want to keep in the output:

MMQGIS Spatial Join


Note that you may need to download/install the MMQGIS plugin from Plugins > Manage and Install Plugins....

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