在 A 点安置仪器,以 B 点定向,采用极坐标法 P 点,该点距离测站 A 为 240m 。 1、 请写出 P 点的点位中误差计算公式 (假设控制点 A 、 B 无误差) 。 2、 若测距中误差 ,要求点位中误差 ,则测角中误差 不应超过多少 (仅考虑测角、量距误差) ?
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