Aerotec uses two methods to verify the vertical accuracy of its LIDAR collection operations.
Aerotec collects weather data (if applicable) simultaneously with the airborne LIDAR data collection operations to account for the sag present in electrical conductors in the area of interest. The weather data (time dependent) consists of:
Horizontal Ground Control
Aerotec uses NGS monuments (where possible) to provide horizontal control for its airborne LIDAR / FODAR / Imagery data capture operations. The GPS units occupying these monuments record continuously during the airborne data capture operations. Subsequently, the ground GPS data is post-processed against the GPS data collected in the aircraft to produce the most accurate (horizontal and vertical) positioning results possible.