R (>= 2.10.1), stats, basemaps, maps, sfheaders
geosphere, ks, lazyData, raster, reshape, rgdal, rgeos,
rworldmap, rworldxtra, sp
geosphere, ks, lazyData, raster, rgdal, rgeos, rworldmap,
rworldxtra, sp
geosphere, ks, lazyData, raster, rgdal, rgeos, rworldmap,
rworldxtra, sp, methods, graphics
geosphere, ks, lazyData, raster, rworldmap, rworldxtra, sf,
methods, graphics, sp