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This function is defunct as of bcmaps 2.0.0. Use raster::union() for SpatialPolygonsDataFrames, or sf::st_union() with sf objects instead.
raster::union()
SpatialPolygonsDataFrame
sf::st_union()
sf
self_union(x)
A SpatialPolygons or SpatialPolygonsDataFrame object
SpatialPolygons