A road construction firm needs altitude data of road path before and after the construction and the error should be less then 3cm (2 inch). Normally they put a ground station and workers manually read altitude data every 10 meters. How this precision would be achieved using drones? The rtk receiver on drone only tells the exact location of drone, not the location (altitude) of the ground below the drone. One way that came to my mind is combinig rtk+lidar. The rtk gives altitude of drone and laser tells its distance to ground. but the error in rtk plus error in laser would more likely reach above 3cm. Thus how the drone companies solved this issue?
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