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四等水准测量,“后-后-前-前”观测法,后视尺,前视尺,下丝读数1.743,上丝读数1.315,中丝读数1.529,中丝读数6.214,下丝读数1.113,上丝读数0.685,中丝读数0.899,中丝读数5.686,四等水准测量数据,测站编号,点号,后尺,前尺,下丝,上丝,下丝,上丝,后视距,前视距,视距差d(m),d(m),方向及尺号,水准尺读数 ( m),黑面,红面,K+黑-红,平均高差 (m),备注,K1=4.687K2=4.787,四等水准测量记录,(1),(5),(2),(6),(9),(10),(11),(12),后,前,后-前,(3),(7),(4),(8),(15),(16),(13),(14),(17),(18),1,2,1.743,1.315,42.8,0.0,0.625,0.062,56.3,-1.1,1.113,0.685,42.8,0.0,1.034,0.460,57.4,-1.1,后1,前2,后-前,后2,前1,后-前,1.529,0.899,+0.630,6.214,5.686,+0.528,0.366,0.747,-0.381,5.151,5.434,-0.283,+2,0,+2,+0.6290,+2,0,+2,-0.3820,四等水准测量的主要技术依据,