How did Ji Dan, a politician in the early Western Zhou Dynasty, record the process of choosing maps to build a king city and its site?

This is how Ji Dan, a politician in the early years of the Western Zhou Dynasty, used a map to choose the location of Wang Cheng and Cheng Zhou in BC 1 125.

"Zhao Gong phase curtilage, duke of zhou, shang zhou, to inform, for the patent. Duke Zhou bowed down and said, "I will give back my democratic rights ... I will give it to Yi Mao, and then I will go to Roche. I'm Bu Heshuo Aquarius, and I'm Bu Jianshui, but I don't eat. I eat water, and I eat food. He's here for painting and divination. " "

The map in "Draw a Picture and Offer Divination" was specially drawn by Duke Zhou in order to choose the city site. This passage is about the preliminary geographical survey of Zhao Gong, and then the Duke of Zhou chose the city site. Duke Zhou went to the scene for divination. He first divined in Aquarius (now northeast of Xun County, Henan Province) north of the Yellow River, but there was no result. It is also the place east and west of Bujian River. Therefore, the city site should be on the Luohe River. The envoy presented the results of divination to the king together with the map. So two cities were built. Chengzhou is located east of the water, and Wangcheng is located east of Jianshui and west of the water. This incident shows that maps have been used in political decision-making and the practical work of urban site selection.