Returns a SpatialPolygonsDataFrame for Geographic Area Coordination Centers (GACCs)
logical specifying whether to only return the name without creating the file
logical specifying whether to create "_05" version of the file that is simplified to 5%
A GACC shapefile is downloaded and converted to a
SpatialPolygonsDataFrame with additional columns of data. The resulting file will be created
in the spatial data directory which is set with
Name of the dataset being created.
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