Most commonly used cameras in photogrammetry are the aerial and terrestrial cameras. Photos taken with these are mostly used for topographic mapping and other surveying or engineering applications. Cameras used in these applications are termed metric cameras. A metric camera is one in which focal length and internal dimensions are exactly known or can be determined through calibration
Up until 2001, the field of aerial photography for mapping was the sole domain of the analogue aerial camera. ZI Imaging GMBH launched the first commercially available Digital Modular Camera (DMC) for aerial photography in 2001.
THE AERIAL SURVEY CAMERA
The analogue aerial survey camera has all the features of the conventional camera, however, it is much bigger, it is automatic and it has been adapted for its specific task. Because of the size of the camera and because of the fact that the orientation of the photos are important, the camera is mounted in the aircraft. The movement of the camera is mechanically or electrically achieved.
Aerial photography 1918
Digital aerial systems (Cameras/sensors)
With the advent of the digital era and improved technological developments it was inevitable that a digital imaging system would come into being. Due to the versatility of the new system the term “Camera” is no longer a true reflection of the capabilities of system. This is entirely due to the fact that the system can be set up as a “Multispectral” unit which not only capture images in Colour or panchromatic (Black& white) but can also capture other spectral information such as infra red or ultra violet.
Digital Camera in Aircraft
For more information, please visit these external links
http://www.gisdevelopment.net/proceedings/mapafrica/2008/maf08_ZAKIEWICZ.pps (12.8 MB -13,412,864 bytes)