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主要介绍后方交会网络图定位法的三种图解法。作辅助点的网络图定位法;先求偏心距微角的网络图定位法;置仪点在桥中线方向上的后交网络图定位法。并各举一算例予以说明,最后介绍了后方交会法的精度估算。
Mainly introduces the rear intersection network map positioning method of three graphical method. As the auxiliary point of the network map positioning method; first seek eccentricity micro-angle network map positioning method; set the instrument point in the direction of the bridge line after the cross-network map positioning method. And give an example to illustrate each. Finally, the accuracy of the rear intersection method is introduced.