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based on the question "How to add state polygon information to a city point?" I have an additional question:

With "join attributes by location" I got a layer that constist of the city names with the corresponding ferdale state names. There is just one problem: Lots of the cities are located on the coast and maybe they are not accurate located.

My idea is to create a buffer-zone around the external border. Is there a possibility in QGIS?

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Yes you want to

Run the buffer process from the menu: TOOLS -> Geoprocessing Tools -> Buffer(s)

I am not sure an appropriate buffer distance for you, but be sure to set that and run the tool.

here are some tutorials with pics explaining it in further detail:

https://docs.qgis.org/2.8/en/docs/gentle_gis_introduction/vector_spatial_analysis_buffers.html

https://wiki.osgeo.org/wiki/Buffer_with_QGIS

QGIS - Create buffer in meters

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