Take GeoMapping. In this map from Kenya, the red dots show where all the schools financed by donors are located, and the darker the shade of green, the more the number of out-of-school children.
比如像来自肯尼亚的地图应用“GeoMapping”， 上面的红点代表所有被捐款者资助的学校位置， 并且在绿色阴影越深的区域， 有越多的不在读孩童。