An important part of the activities of N.A.D.A.R. is dedicated to aerial photography.
Aerial photography is almost as old as the aviation, but its main development occurred during WW2. It did not stop evolving since, with the improvement of films, cameras, planes, navigation systems, etc. The aerial photos acquired with "metric" cameras are ideally analysed using equipment and techniques of photogrammetric compilation, able to determine, with a precision of the order of the centimetre, the position of visible objects on photos, and this in 3 dimensions (the use of stereoscopic pictures allows to determine the height of objects). Regrettably, this very sophisticated technology is also very expensive and rather heavy to implement.
If some applications really require the maximum of performances offered by "metric" aerial photos, many users will only exploit a small part of this potential, to - for example - estimate the density of the vegetation density, to count the number of houses in a settlement, to estimate the damages of a flood, etc. For these users, a precision of location of the order of one metre is more than sufficient, but it is more important for them to work on very recent images and t o be able to repeat the observations in the time.
For all these reasons, we developed a parallel method of acquisition of aerial photos.
These photos can be organized by various manners, according to the needs of the mission.
All photos produced by NADAR are geotagged: they include information about their position. This information greatly facilitates the organisation and consultation of archives.
We photographied so far more than 150 sites to produce different types of results, for different types of applications.