.1. 已知HA=358.236m, HB=632.410m,求hAB和hBA分析:hAB指B点相对于A点高差,即B点比A点高多少(用减法),hBA亦然。解:hAB=HB-HA=632.410-358.236=274.174mhBA=HA-HB=358.236-632.410=-274.174m2. 设A点高程为101.352m,当后视读数为1.154m,前视读数为1.328m时,问高差是多少,待测点B的高程是多少?试绘图示意。分析:高差为后视读数减去前视读数,B点高程可用仪高法或高差法,高差已求,故用后者。解:hAB=1.154-1.328=-0.174mHB=HA+hAB=101.352-0.174=101.178m3. 已知HA=417.502m,a=1.384m,前视B1,B2,B3各点的读数分别为:b1=1.468m,b2=0.974m,b3=1.384m,试用仪高法计算出B1,B2,B3点高程。分析:仪高法先求视线高程,再按分别减去各前视读数,求得高程。解:i=HA+