短语
零线改正
correction of zero line
基线改正
base correction
零[位]线改正
correction of zero line
定直线改正
alignment correction
零位线改正
correctionofzeroline
垂线偏差改正
correctionfordeflectionofthevertical
;
deflection of the vertical correction
等经度改正线
[测]
isolong
改正纬线
rectifying latitude