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I have just inserted a raster PNG file into ArcMap. I am trying to do buffers on certain features present in the raster after converting it into a polygon shapefile. Is there anyway that I can dictate the exact size of this raster I have inserted as it does not have any information dictating its size and when I convert it into a polygon shapefile, it comes up with areas and lengths of the polygons but they are in unknown units.

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