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地图投影是地图的数学要素之一,也就是将地球面上的经纬网转移到平面的地图上来的数学方法。投影的方法不同,画出的经纬网形式就不同,所绘制的图形轮廓也不同,因而必然直接影响到地图的使用,如不注意,甚至造成谬误。例如有的同志在等差分纬线多圆锥投影的世界图上量赤道长度,怎样也得不到正确的结果;在墨卡托投影的世界图上比较格林兰岛和南美洲的面积,
The map projection is one of the mathematical elements of the map, that is, the mathematical method of transferring the latitude and longitude network on the surface of the earth to a plane map. The method of projection is different, the drawn form of the latitude and longitude network is different, and the outline of the drawn figure is also different. Therefore, it will inevitably directly affect the use of the map, if not pay attention, and even cause errors. For example, some comrades are quantifying the length of the equator on the world map of differential cones of multi-cone projections, and how the correct results are not obtained; the area of Greenland and South America is compared on the Mercator projection world map.