4 ) adopt the method of psychology - physics experimentation to discuss the color scheme of electronic map and verify the effect of the electronic map ' s multi - scale representation . finally , sum up the rules of electronic map ' s representation from map area load 4 )采用心理物理学实验的方法探讨了电子地图的颜色设计方案和多尺度表达的效果验证,从图面面积载负量的角度总结了电子地图表达的规律。