Why Digital Imagery are popular for aerial photogrammetry

Airborne digital cameras for aerial photogrammetry are becoming more common and are anticipated to grow rapidly in the next three years. Digital aerial imagery offers many advantages over film-based cameras. There is a great savings in time because the aerial data can be moved directly to a computer for processing, as there is no need for film processing and scanning. Ortho rectified imagery is available in hours instead of days that allows for rapid response.

The aerial digital camera has a greater dynamic range over film so that shadows can be eliminated and radial balancing is easier. This also allows for more flying days under varying cloud conditions and more flying hours in a day.

The lenses on aerial digital camera sensors produce a flatter or less distorted image. A immeasurable of affordable lenses allow the user to control the field of view and pixel size at a given altitude in order to tailor the imagery to specific project requirements or marry the imagery with other sensors. The longest focal lengths provide the ability to narrow the field of view and produce aerial imagery with less relief displacement than possible with conventional sensors.