参考文献:
1. TAO Zhu. 2016. Research progress of the two-step floating catchment area method and extensions[J]. Progress In Geography, 35 (5): 589- 599.
2. 贝壳研究院——房产行业数据分析 https://research.ke.com/data/
3. Census Bureau, American Community Survey (ACS) and Puerto Rico Community Survey (PRCS), 5-Year Estimates. The PRCS is part of the Census Bureau's ACS, customized for Puerto Rico. Both Surveys are updated every year.
4. LondonLabor Force Survey, Office for National Statistics 2017
5. Paris Traffic congestion statistics for Paris based on TomTom's historical database for 2016.
6. 2015 survey by the NHK Culture Research Institute (in Japanese)
SeoulResults of the 2015 Population and Housing Census (Internal migration, commuting and activity constraint)