Construction lofting is an application branch of surveying. It requires that the artificially designed points be calibrated on the site by using certain instruments through certain methods. In the past, many conventional lofting methods were used, such as Theodolite intersection lofting, Total station corner lofting, etc. When setting out a design point, it usually requires moving the target back and forth, and 2-3 people to operate. At the same time, it also requires good intervisibility between points during the lofting process, In production applications, the efficiency is not very high. Sometimes, when encountering difficulties in lofting, many methods can be used to loft. If RTK technology is used for lofting, only the designed point coordinates need to be input into the electronic notebook and carried by the GPS receiver. It will remind you to go to the position of the point to be lofted, which is both fast and convenient. Due to GPS's direct lofting through coordinates, and the accuracy is high and even, Therefore, efficiency will be greatly improved in field layout, and only one person is required to operate it

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