Source: https://www.coursum3.org/lufr-3-sciences-humaines-et-sciences-de-lenvironnement/?wpdf_download_file=/home/ichigo1vs/www8/wp-content/uploads/cours/UFR3/G%C3%A9ographie%20Am%C3%A9nagement/l1/Introduction%20et%20histoire%20de%20la%20cartographie/commantaire%20des%20cartes%20topo.pdf