Study of Urban System Spatial Interaction Based on Microblog Data: A Case of Huaihe River Basin, China

Table 3

Classification of inflow rating.

Grade	City	Inflow rating
1	Jining, Xuzhou, Bengbu, Yancheng	60,001–96,000
2	Shangqiu, Huaibei, Huaiyin	40,001–60,000
3	Kaifeng, Linyi, Lianyungang, Yangzhou, Liuan	20,001–40,000
4	Pingdingshan, Xuchang, Luohe, Xinyang, Zhoukou, Fuyang, Bozhou, Huainan, Suzhou, Zaozhuang, Suqian, Rizhao	10,001–20,000
5	Heze, Zhumadian	10,000