|Green areas have a diversity of family names, red areas have only a limited amount of family names. Image from Science Magazine.|
In a background note, the study itself shows the position of sciences in the People's Republic of China. Geography is highly invested with engineering in China. Geography in the People's Republic of China is more along the lines of GIS and applied physical geography rather than sedevacantist in the United States and Marxist-Human in academia and Global Studies in lower grades in the United Kingdom. Instead, simple human geography studies like this are being done by anthropologist in China.