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在1∶10000以上的小比例尺測圖中,作解析圖根点或作导綫与远距离的三角点相联結工作,最便利的方法是后方交会法。尤其在广濶地区使用更为广泛。苏联的工作經驗指出:在草原地区採用后力交会法决定控制点的約佔80％。后方交会点的精度,有时是不高的,有时甚至大大超过規定的誤差范圍。如果佈点时,不能預先防止这种超限現象的出現,和求得最高精度的有利方案,就是最仔細的观測,也难保証得到滿意的結果,和免去需要重測的危險。因此,后方交会点的精度估計工
In the small scale of 1: 10000 or above, the most convenient method is the rear intersection method, which is the root of the analysis diagram or the connection of the wire with the long-distance triangle point. In particular, it is more widely used in Canton area. The Soviet experience shows that about 80% of the control points are decided by the TTC in the grasslands. The accuracy of the rear rendezvous point, sometimes not high, and sometimes even exceeding the provisions of the error range. If deployed, the inability to prevent this overrun in advance and the most advantageous solution for obtaining the highest precision are the most careful observations, the assurance of satisfactory results, and the avoidance of the need to retest. Therefore, the precision of the rear intersection point is estimated