Description: The shapefile of Shanghai underground lines and data of each station is from a Chinese forum. The open year of each station is from the Shanghai traffic website and we intergrate them together to a new geojson file and publish it to the GitHub. Each underground line is shown by a unique color which is close to the real world and each circle represents a station. There is a hover effect on each station, which shows the name of the station and its line. The time slider shows the development of each station year by year.