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An Entity of Type : prov:Entity, within Data Space : webisa.webdatacommons.org associated with source dataset(s)

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  • Those kinds of images are often drawn by overlaying a mask shapefile on top of the others, drawing it in gray with some alpha transparency. (The mask is the set-theoretic complement of the area of interest and is readily created using geoprocessing operations such as a union.) This requires no change in any of the layers that make up the map itself.
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