Table 2.

POI data classification.

Primary classification	Secondary classification	Quantity	Proportion (%)
Commercial	Shopping services, catering services, accommodation services, leisure, entertainment, and finance	94857	28.78
Green Square	Tourist attractions and park squares	2021	0.61
Industrial	Corporations, industrial and mining plant, and industrial park	94146	25.56
Public	Government agencies, healthcare services, and public facilities	91809	27.86
Residential	Residential area and commercial residential area	21600	6.55
Science and education	Institutions of higher learning, vocational colleges, middle schools, primary schools, scientific, and educational places	25162	7.63