What is Aerial photography?
- Aerial photography is the acquisition of a vertical image with a specialize camera installed on board of an airplane, equipped for this type of work.
- Airborne acquisitions are always performed in such a manner that two consecutive photographs have a side and forward overlap. These overlaps enable a three dimensional (3D) observation of the territory, with the help of a specialized tool. The optical phenomenon, which makes it possible to see in 3D, is called the stereoscopy.
Why use aerial photo?
- An aerial photograph is rich in information. It is possible to pinpoint, amongst others, rivers, ponds, paths and clearings, which are not shown on a map. It is also possible to recognize cuttings and burns, as well as determine changes and types of vegetation. However, the incontestable advantage of aerial photography remains in the possibility of obtaining a three dimensional view of the territory, thus the relief, by stereoscopy.
- The orthophotograph is halfway between the aerial photograph and the topographical map. It offers the aerial photograph’s details and richness, combined with the geometrical precision of a map. Because it is georeferenced, geographical information such as hypsometry (relief representation), toponymy (places names: lakes, rivers, road network) and territorial limits (administrative, recreational and protected).
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