The surveyor plays a critical role in the aerial mapping process. They provide horizontal and vertical control for the mapping and they also provide supplemental information for the aerial mapping. Under the direction of an "aerial mapper", the surveyor places aerial targets on the ground at positions that will provide adequate visual coverage for the photography. The surveyor will then provide the mapper with a list of coordinates and elevations for each aerial target. These are used as a control to set up the photographic model of the site. Supplemental information provided by the surveyor can include manholes, fire hydrants, or other items not visible by photo. In areas of critical match points, the surveyor may be able to provide information that is more precise than what is available by aerial mapping alone.
Other Important Things to Consider
Some companies use of a combination of GPS for horizontal control and traditional methods for vertical control, which allows them to provide the accurate information needed to bring an aerial mapping project to a successful conclusion
Camera systems/photography should be equipped with Forward Motion Compensation and low distortion, high resolution lenses. These aerial mapping cameras are designed for vertical aerial photography in a 9" x 9" format.
Developing a flight plan helps to ensure the flight coverage encompasses the entire mapping boundary.
Film should be processed immediately after the aerial photography has been flown.
