Brief introduction of railway line survey stage and main work

Railway line survey is divided into initial survey, final survey and supplementary survey according to the design stage. The initial survey includes plane and elevation control survey, aerial survey and mapping, hydrological survey and section survey. Fixed survey and supplementary survey include plane and elevation control survey, topographic map verification, midline survey, hydrological survey, section survey, cross survey of roads and wires crossing the line, drilling and punching, etc.