I have taken a pdf of a map and managed to import it into my map using the QGIS geolocator. Now I want to convert the resulting raster layer to a set of polygons that match up with the existing vector layers. When I polygonize the raster layer, it's a mess.

Can someone get me started in the right direction?


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Map with raster (w/ transparency)

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Map with polygonized raster

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Or is it easier to use the raster overlay to note by hand which of the small areas fall within the the respective raster's areas?

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