R/helpers.R
    GADM_spoly.RdGet SpatialPolygons of countries at distinct administrative levels
GADM_spoly(country_code, boundary_level, keep_data = FALSE)
| country_code | (character) code of country or countries of interest.  | 
    
|---|---|
| boundary_level | (numeric) level of administrative division to be considered.  | 
    
| keep_data | (logical) whether or not to keep downloaded files. Default =   | 
    
A SpatialPolygonsDataFrame from the GADM database at the level selected.
If an error occurs when downloading any of the spatial objects based on
country_code, the result is NULL.
map_gadm <- GADM_spoly(country_code = "UY", boundary_level = 0)