Gis-based road rehabilitation of the map on the Datong zone of the Great Wall defense system in Ming Dynasty
CAO Ying-chun1,2,ZHANG Yu-kun1,ZHANG Hao-yan1
Journal of Hebei Agricultural University . 2014, (2): 138 -144 .  DOI: 10.13320/j.cnki.jauh.2014.0053