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）。
Until about 20 years ago the first was answered by a map and compass, and accuracy depended on the competency of the user.
直到大约20年前第一由地图和指南针回答，并且准确性取决于用户的能力。
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。
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；
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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