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）。

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On the basis of this, a pole-map based localization was introduced which does map-matching using iterative closest points and can enhance the accuracy of localization.

在此基础上，采用基于柱图的定位方法，使用迭代最近点算法进行地图匹配，提高了定位精度。

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When the precise geometric rectification of TM imagery was made with the ground control points selected from topographic map in scale of 1:100000, the accuracy of half a pixel is high.

由1：10万地形图选取平面控制点对TM磁带进行精处理，平面定位精度为半个象元，精度较高；

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