The surveyor establishes aerial targets as the basis for horizontal and vertical control for aerial mapping, which includes analogue and digital photogrammetry and aerial imagery. With the advent of onboard GPS, aerial targeting has become somewhat less critical, but for accuracy and precision targets are still required on most projects.
LiDAR check points are essential to performing quality assurance on LiDAR data sets. Check points are performed at different ground cover locations, including: grass, dirt, vegetated areas, asphalt pavement and concrete pavement. These check points allow the individual processing the LiDAR to check horizontal and vertical accuracy as well as the filtering algorithm’s that were utilized on the project.
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