有时为了简明地反映量的特征,对非连续分布现象(如人口密度)经特殊处理后也用等值线法表示。等值线图是专题地图的...创造了用等值线表示平均气温的制图方法。-Sometimes in order to reflect the amount of simple characteristics of the phenomenon of non-continuous distribution (such as population density) was also used after special