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.
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).
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).
彩色地图是用不同的颜色表示各个数据层，可以利用颜色信息有效地实现地图各个数据层的自动提取。
Usually each color represents a data layer in a color map, so the automated segmentation of scanned color map can be done using the color information.
文中着重从叠加层的设计、控件的设计、电子地图的显示设置以及与运输管理系统中的数据关联等方面进行了阐述。
The paper focuses on the design from the overlay, the control design, digital map display Settings as well as transportation management systems associated with other aspects of the data set.
文中着重从叠加层的设计、控件的设计、电子地图的显示设置以及与运输管理系统中的数据关联等方面进行了阐述。
The paper focuses on the design from the overlay, the control design, digital map display Settings as well as transportation management systems associated with other aspects of the data set.
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