Character vector of named regions. An ISO-3166-1 code or a custom name. You don't have to specify the suffix (admX) nor the file extension (.rds).
level
Integer the level of the administrative boundaries (0 is the country, higher values equal finer divisions)
basefile
Character vector the path of the directory where shapefiles are stored. Default is "./"
baseurl
Character vector The url of GADM files. Default is "https://biogeo.ucdavis.edu/data/gadm3.6/Rsf/"
simplify
Numeric Numerical tolerance value to be used by the Douglas-Peuker algorithm. Higher values use less polygon points (and less memory) and lower values use more polygon points (and more memory). We suggest not going higher than 0.025 in order for intra-country boundaries to align.