Returns a SpatialPolygonsDataFrame for CARB air basins,
The California Air Basins layer is a polygon shapefile coverage representing the 15 California air basins, as defined in state statute and regulation. See the California Health and Safety Code, Section 39606 et seq. and California Code of Regulations, Title 17, Section 60100 et seq.
Air Basins are designated pursuant to California statute and regulation. Air Basins identify regions of similar meteorological and geographic conditions and consideration for political boundary lines, and are related to air pollution and its transport.
Logical specifying whether to only return the name without creating the file.
Logical specifying whether to create "_05", _02" and "_01" versions of the file that are simplified to 5%, 2% and 1%.
Name of the dataset being created.
March, 2004 version.
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