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With China ageing rapidly, the health of the elderly has become a public concern. Access to urban parks, offering both physical and psychological health benefits to people, is critical for the elderly. To explore whether there are disparities in park access for the elderly, we collected and processed population data, point of interest and travel time from census tracts to parks by public transport in Shanghai. The visuals based on the data indicate that, in Shanghai, most of the elderly are able to reach large parks in 30 minutes, but gaps remain in the number of accessible parks. Although the ageing population living between the inner ring road and the external ring road is as large as that inside the inner ring road, the number of accessible parks for this population is much lower than for the latter.

Traditionally, Chinese would go back to their hometowns to reunite with their families during the Chinese Lunar New Year. In the last 30 years, due to the uneven development of regions, Spring Festival travel rush were mainly from large cities to small cities or rural areas. However, in recent years, an increasing number of migrants prefer to stay in larger cities and have their families visit them during the Spring Festival. To map the reverse migrations and explore their influence, we collected and processed data on passenger travel in 2017 and 2018 from Tencent Location Big Data and GDP in 2017 at the prefectural level. The visuals based on the data indicate that the volume of reverse migration was mainly concentrated in regional centers, with great variation across cities. Besides, with increasing reverse traffic flows, large cities are shifting from being empty to vibrant cities during the Spring Festival, while small cities and rural areas are losing their vibrancy.

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