Aerial photography is the art of taking photograph of any feature, landscapes or phenomenon on the earth surface for the purpose of building maps with the help of a camera which may be mounted on any aerial platform or held in hand.
History of Aerial Photography:
In 1858 Persian photographer and balloonist Felix Nadar took the first Aerial Photograph from a air balloon. The airplane was used first by Wilbur Wright for Aerial Photography in 1909
Characteristics of Aerial Photography:
Types of Aerial Photography:
Distortions in Aerial Photography occurs due to change in the location of the photo which alters the basic nature of the photo. The main types of distortions in Aerial Photography are :
Displacement in Aerial Photography is caused by change in the altitude from where the photograph is taken. The main types of displacement in Aerial Photography include :
Types of film used in Aerial Photography :
- Panchromatic which produces black and white images.
- Infrared which is sensitive to infrared rays along with black and white.
- Color film is the same which is used in hand-held camera.
- Camouflage detection which records vegetation in reddish tone. Blue or purple tone are also found in this type of film.
Use of Aerial Photography:
- land-use planning and mapping
- geologic mapping
- environmental mapping
- commercial mapping
Advantages of Aerial Photography :
- Aerial Photograph y provides an ever lasting memorializing of data and the current view of the earth surface.
- The spectral sensitivity is more encompassing than human eyes and the photo is obtained quickly.
- The spatial resolution of Aerial Photography is better than any other imagery.
Disadvantages of Aerial Photography :
- Images cannot be identified without taking stereoscopic views and overlapping photographs.
- Interpretation is difficult in poor light condition.
- To interpret a map proper training is essential.
- Only marginal data is found.
But it can be said that despite of some shortcomings, Aerial Photography is considered as an important tool for map making even today.