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Compares\npolygon footprints across periods using the\nintersection-over-union (Jaccard) index (Jaccard, 1912)\n to identify new\nconstructions, potential demolitions, and footprint changes.\nSupports vector file formats readable by 'sf', including\nShapefiles and GeoPackage (GPKG) vector files with named\nlayers, optional boundary clipping, and reprojection to a\ncommon coordinate reference system. 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