实验对象是从武汉大学遥感信息工程学院和测绘学院02级，03级和04级学生中随机选择，每个年级有124个学生。
The subjects were chosen from 2004-year , 2003-year and 2002-year students in School of remote sensing information engineering and School of geodesy and geomatics , with 124 for each grade . Their selection was random .
武汉大学遥感信息工程学院