Establishing horizontal and vertical controls is important on your construction project as these control points ensure accuracy on any subsequent surveys including topographic surveys, aerial mapping, deformation monitoring, and others.
Precise control surveys require adjustments for geodetic or atmospheric variances including addressing the curvature of the Earth, optical refraction of sightlines, and horizontal distance scaling.
In addition to these corrections to measurement, Survey Control Networks incorporate many statistical adjustments to prove the repeatable accuracy of the control and to isolate and eliminate other potential sources of measurement error.
Challenger typically uses GPS, Total Stations and Optical Levels to gather this location data and these horizontal and vertical controls are measured in relation to survey monuments or reference points. The established control is monitored and verified throughout a project for any disturbance. Lost or disturbed monuments are adjusted or replaced as needed to maintain the integrity of the network.