How do you maintain geometric control during cable-stayed bridge construction?

Bridge geometry control: establish baseline along alignment connected to local control network. Tower verticality monitored by precise total station from multiple positions. Real-time monitoring system tracks tower position during construction. Deck casting/launching requires camber prediction - theoretical profile adjusted for deflections during staged construction. Cable tension monitoring coordinates with geometry. Survey at each stage: before/after segment installation, after cable stressing. Forward prediction based on structural analysis guides pre-camber. Control points on deck for alignment verification. Night observations minimize thermal effects. Closure survey verifies design geometry achieved. As-built documentation for maintenance baseline.