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This example consists of a shapefile, which is a simplification of the raw noise model output (raster images). The shapefiles contains the polygons that are defined by noise iso-lines, each with an interval of 5dB difference. Many memberstates will publish their strategic noise maps in this way. Note that this data production is obliged by the European Noise Directive (EC/2002/49) each 5 years, just to point to the importance of a correct INSPIRE implementation for this kind of data!