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为探讨长度投影变形对CPⅢ平面网精度的影响,选择3段不同长度的实测CPⅢ平面网,作为对照,仿真一段没有投影变形的CPⅢ平面网,然后对这4段CPⅢ平面网分别添加不同大小的边长投影变形改正,统计不同的边长投影变形改正下对应的CPⅢ平面网的精度,发现CPⅢ平面网精度最佳时的边长改正与由原始观测值自由网平差后坐标转换中的尺度比参数K一致,得出了采用K值作为边长改正可以最大程度的提高CPⅢ平面网精度的结论。这一结论能为正确进行CPⅢ平面网数据处理提供有益的参考。
In order to discuss the effect of length projection deformation on the accuracy of CPⅢ plane net, three sections of CPⅢ plane net with different lengths were selected as a control, a section of CPⅢ plane net without projection deformation was simulated, then the four sections of CPⅢ plane net were added with different sizes Side projection deformation correction, statistics of different side length projection deformation corrections corresponding CP Ⅲ plane network accuracy and found that the CP Ⅲ plane net accuracy of the best when the edge length correction from the original observation of the free-network adjustment after the coordinate conversion scale The result is consistent with the parameter K, and the conclusion that using the K value as the correction of the side length can greatly improve the precision of the CPⅢ plane net can be obtained. This conclusion can provide a useful reference for the correct data processing of CPIII plane network.