Applications: Aerial

Aerial photography is usually collected at larger scales than spaceborne imagery, with more accurate control necessary to meet tighter mapping accuracies. In these cases, Centimeter control is generally required, as current control standards required for control accuracy to be within 1/10,000 of the flying height in vertical, and 1/7,000th of flying height in horizontal.

To meet these requirements for large-scale aerial photography, CompassData uses survey-grade base station receivers to collect data while stationed on a well-known reference point, such as an NGS monument, while collecting Ground Control Points with a GPS rover simultaneously.

Longer occupation times at both the base station as well as with the rover units while collecting GCPs ensures adequate GPS data to support meeting these positional requirements. For larger areas or for those projects requiring very stringent control accuracies, two or more survey-grade GPS receivers may be utilized to guarantee meeting the positional standards derived from flight height and output mapping requirements.