在GPS测量中，往往需要计算三角形、多边形闭合差，以便及时发现观测粗差、衡量GPS观测精度。
In GPS surveying, we usually need to compute closure difference of triangle or polygon, so as to search surveying gross errors and estimate GPS observing precision.
在GPS测量中，往往需要计算三角形、多边形闭合差，以便及时发现观测粗差、衡量GPS观测精度。
In GPS surveying, we usually need to compute closure difference of triangle or polygon, so as to search surveying gross errors and estimate GPS observing precision.
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