Map projection in cartography is a way to present a two-dimensional curved surface on a plane, such as a normal map. Figure 2 shows a Traverse Mercator projection.
绘图法中的地图投影方法可以在平面中表示一个两维的曲面，例如一个标准地图。
OpenLayers does not have the ability to re-project data itself, so all data included in a map must also be provided in Spherical Mercator projection.
OpenLayers本身并不具备重新投影数据的能力，所以包含在地图内的所有数据必须在Spherical Mercator投影内提供。
The map you're used to seeing pinned on classroom walls and in Atlases is known as a Mercator projection, and was first presented by the Flemish geographer Gerardus Mercator back in 1569.
过去常被钉在教室墙上而且常出现在地图册中的那幅地图以墨卡托投影著称，最早是由弗兰德地理学家杰拉杜斯·麦卡托提出来的，可追溯至1569年。
For example, the Mercator projection is widely used by boats and ships because it produces a map in which lines of constant bearing are a straight line, which greatly simplifies navigation.
例如，墨卡托投影是广泛使用艘舟艇，因为它产生的地图中，不断轴承线一条直线，从而大大简化了导航。
The mercator projection is one of the most used world map projection.
麦卡托式是最常用的世界地图投影法。
The mercator projection is one of the most used world map projection.
麦卡托式是最常用的世界地图投影法。
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