ABSTRACT
A good aerial photograph should satisfy three demands. Firstly, it should furnish maximum information, which necessitates correct choice of optics of the camera used, combination of film and filters and conditions of acquisition. Secondly, the photographs should cover the entire region under study. Thirdly, it should facilitate accurate measurements of length and area, which necessitate metric cameras and precise geometric analysis of the entire sensor-platform system. Special cameras, known as metric cameras, were developed for acquiring aerial photos. They represent cameras for which any geometric and chromatic distortion can be detected and measured. Several types of aerial photos can be distinguished depending on the position of optical axis with respect to the vertical and motion of the aircraft. Two oblique panoramic photographs together with a vertical photograph constitute a trimetrogon system. The photographs should have an overlap for obtaining a stereoscopic view.
