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I am new to working with GIS. I have a raster choropleth map similar to the one displayed below. I want to create a shapefile from the map, where each layer contains all the countries that have the same color. In this example, Brazil and Argentina would be in the same layer. Is there a way to automatically select all the regions that have the same color? Alternatively, can I select an area that is enclosed by the black lines, e.g. Brazil? In photoshop, there is a "quick-selection" tool that does this. I am using QGIS.

  • Is it a raster- or a shapefile? – Stefan Jan 8 '16 at 15:14
  • It's a raster, I want to create a shapefile based on the raster that I have. – toldo Jan 8 '16 at 15:18
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First follow this tutorial to convert raster to vector in QGIS. http://manual.linfiniti.com/en/complete_analysis/raster_to_vector.html

Next make selections on the shapefile, based on the attribute values of the countries.

Finally export the selection.

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