去年九月，苹果就收购了Placebase，一家可以为地图添加数据层的创业公司。

Last September, it bought Placebase, another mapping startup, which adds layers of data on top of maps.

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关键的几点是：将地图文件的投影设为EPSG： 4326以及定义想要拉入的wms层及其相应的元数据(LAYER部分)。

Key points include setting the projection of the map file to EPSG: 4326 and defining the WMS layer you want to pull in along with its appropriate metadata (the layer section).

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Placebase在原始地图数据顶端的层可以抽取出一个基础的服务，这样用户可能根本不会注意（除非，当然，还有性能，准确性或容量的问题）。

Placebase layers on top of raw map-data would abstract a new underlying service so that users may not even notice it (unless, of course, there are performance, accuracy or capability issues).

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