The project covers a large area. According to the general layout, Leica TCA2003 total station (measuring angle 0.5 ", ranging 1+1PPM) is used to survey a closed or attached traverse from the advanced starting point in the field area, and then the polar coordinate method is used to determine the vertical and horizontal main axes of the building. After the angle and distance calibration meet the requirements of point location tolerance, it will be used as the first level of the main area
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