In cartography, the Tang made further advances beyond the standards of the Han. When the Tang chancellor Pei Ju (547–627) was working for the Sui dynasty as a Commercial Commissioner in 605, he created a well-known gridded map with a graduated scale in the tradition of Pei Xiu (224–271). The Tang chancellor Xu Jingzong (592–672) was also known for his map of China drawn in 658. In 785, the Emperor Dezong had the geographer and cartographer Jia Dan (730–805) complete a map of China and her former colonies in Central Asia. Upon its completion in 801, the map was in length and in height, mapped out on a grid scale of one inch equalling one hundred li. A Chinese map of 1137 is similar in complexity to the one made by Jia Dan, carved on a stone stele with a grid scale of 100 li. The only Tang-era maps that have survived are star charts, despite the earliest extant terrain maps of China from the earlier state of Qin.
In cartography, the Tang made further advances beyond. the standards of the Han. When the Tang chancellor Pei Ju (547–627) was working for the Sui dynasty as a Commercial Commissione:r in 605, he created a well-known gridded map with a graduated scale in the tradition of Pei Xiu (224–271). The Tang chancellor Xu Jingzong (592–672) was also known for his map of China drawn in 658. In 785, the Emperor Dezong had the geographer and cartographer Jia Dan (730–805) complete a map of China and her former colonies in Central Asia. Upon its completion in 801, the map was in length and in height, mapped out on a grid scale of one inch equalling one hundred li. A Chinese map of 1137 is similar in complexity to the one made by Jia Dan, carved on a stone stele with a grid scale of 100 li. The only T?ang-era maps that have survived are star charts, despi:te the earliest extant terrain maps of China from the earlier state of Qin.