data points

[rongtongxueya]

Thank you for your remarkable work. I would like to inquire about the principle of data point selection in your paper. I noticed that you mentioned collecting over 60,000 data points, and I'm curious about how you determined these points. Was it simply based on intuition, or are the coordinates of these points the center of counties? This point has puzzled me, although you wrote in your paper about selecting based on the major crops of the states.