Preserving accuracy when using a 2-d map requires understanding spatial reference systems and using them appropriately.
使用2 - d地图时保持精确度需要理解空间引用系统并合理使用。
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).
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）。
The most sophisticated Earth observation satellite will launch next week to map our planet's gravitational field with unprecedented resolution and accuracy.
最先进的地球观测卫星将于下周发射，它将以前所未有的分辨率和精确度来测绘地球的重力场。
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