算法的追踪结果精度取决于等值点的计算方法，其精度是可控的。
The precision lies on the computing method of contour points and can be controlled.
在采用网格法追踪等值线时，如果某个网格四条边上都有等值点，等值点的连接就会出现多义性问题。
Assume that there is an equivalent node on each side of a grid when using gridding method to draw isoline, how to connect these nodes is ambiguous.
利用迭代最近等值点(ICCP)算法对重力图上的航迹进行匹配可以减小惯性导航系统误差，但计算量大。
It can reduce the error of the inertial navigation system when using Iterative Closest Contour Point (ICCP) algorithm for track matching on the gravity map, however it brings large computation costs.
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