What is the measuring line on the highway? Is it measured by an instrument such as a theodolite?
Put the line is to set the coordinates on the map in the field to go ~ ~ theodolite now has little use, almost eliminated, the total station used a little more
The highway survey and lofting is to calibrate the design coordinates and design elevation of the middle line, the left and right side lines, the road revetment, the retaining wall, the side ditch and so on on the road design and construction drawings, and demarcate them to the actual position of the ground.The instrument can use a lot of road layout, a theodolite and leveling instrument, range finder or steel tape, total station, GPS-RTK, construction units of ordinary common Theodolite Level and measurement ruler, advanced equipment and specialized surveying and mapping units used in the total station and GPS etc..
On line measurement and measurement is different, in general is elevation, instruments or other means of verticality measurement work, put the line is limited to the scope of the construction of buildings, roads, construction plans will reflect to the construction site.Generally use level to determine elevation
