Shanghai (Shanghai and Shenzhen for short) is the national central city and megacity of China [1], the core city of Shanghai, Hangzhou and Ningbo, the international economic, financial, trade, shipping and scientific and technological innovation center [2][3], and the first batch of coastal open cities. Located at the mouth of the Yangtze River, Shanghai is the leading city in the Yangtze River Economic Belt, facing Kyushu Island across the sea, Hangzhou Bay in the south and Jiangsu and Zhejiang provinces in the northwest.