论相对点位精度的合理评定

按现行方法求得的相对点位精度由于未顾及起始数据误差的影响 ,且非实际所需评定的相对点位精度 ,因此并不客观、可靠。本文所提出的协方差基准的概念 ,用来定义相对点位精度和绝对点位精度有其客观性和实用性 ,协方差基准作为控制网点精度的参考基准 ,并不重合于网点坐标的参考基准—坐标基准 ,而可按应用的需要 ,方便地进行协方差基准转换。本文提出了合理评定相对点位精度的新方法 ,并用高精度工程控制网的实测数据进行了分析验证

On the rational evaluation of the relative precision of points

The evaluation of the relative precision of a point by traditional methods is neither objective nor reliable. The first reason is that impacts of errors of initial data have not been taken into account;the second is the unconformity between the result and the practical purpose.As the reference datum for the precision,the datum for covariance presented by the author is not the same as the datum for coordinates. This theoretical concept possessed practicability,when it is applied to defining the absolute and the relative precision of a point.It is convenient to carry out transformation between the two different datums for covariance.A new method of the rational evaluation of the relative precision is put forward.The effectiveness of the method has been demonstrated by the application to a control network.