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Transform KML polygons in their 'mask' equivalent entities. For each <Placemark>: - an universe rectangle(polygon) that covers the studied area is created. - all the previous inner boundaries (holes) become stand-alone polygons and forces a <MultiGeometry> to be created - the previous outer boundary become a hole in the universe polygon created Usage example: $ xsltproc invert.xsl cantons.kml > cantons_inverted.kml If you want to customize the masking area, use 'mask' via --stringparam: $ xsltproc --stringparam mask '-25,15 40,15 40,80 -25,80 -25,15' cantons.kml > cantons_inverted.kml The attached 'cantons.kml' is generated from Swisstopo GG25 dataset. http://www.toposhop.admin.ch/en/shop/products/landscape/gg25_1 For a demo output check this Swiss boundaries map integration (Google Maps, Google Fusion Tables) http://www.vasile.ch/hacks/ft-mask/