qc_download_maps fetch maps from http://www.gadm.org/.
Data frame where the countries ISO codes are. Must contain a
Folder route where the maps are stored or where they will be
stored, by default the working directory. It must be a character object and
it must end without
This function fetch maps from http://www.gadm.org/ if the map is not already present in the maps folder (by default, the working directory).
Maps are downloaded (if needed) and a summary is returned indicating number of maps downloaded and number of maps present in the map folder.
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