Suppl. File

The PSO-BP codes for modelling the relationship among the national official GDP and sum of DN values, which can be run by Matlab (R2017b).用于建模国家官方GDP与DN值（Digital Number）总和之间关联关系的粒子群优化-反向传播（PSO-BP）代码，可通过Matlab（R2017b）运行。