Otimizing the urban photogrammetric digital restitution: the relation between scale fotrograph and the geometric image resolution

Abstract

Nowadays, we can say that a considerable amount of photogrammetric mappings
carried out in the country are still based on digital images proceeding from
analogical aerophotogrammetric cameras and the transformation for the digital form
using the photogrammetric scanners. The reasons for this situation are the high
costs of a metric digital camera, the impossibility of taking photos in all scales, the
existing operational difficulties using non-photogrammetric digital cameras and of
course, the advantages of maintaining the existing technologies in the
photogrammetric mapping companies. Although important changes have happened
added to the analogical-digital productive process, very little has been modified or
proposed regarding the geometric resolution of the image versus mapping scale.
The same concepts and knowledge acquired during the analogical phase are still
being used. Existing variables in the process of generation of digital images from
conventional aerophotos can be combined in order to guarantee a better use of them
when considering the possibility of increasing the benefit/cost relation. As a result,
a new methodology of producing photogrammetric mappings is presented in this
article. The new procedure is based on the performance increasing due to the new
operational flowchart, the less time in the productive process, the necessary positional accuracy and the less cost in generating urban mapping scale 1:2.000.