Platforms for aerial survey include aircrafts, helicopters and other air vehicles. Aerial images are taken with special digital cameras.
There are two types of aerial survey: vertical and oblique.
The vertical aerial survey it is when images are captured by one or two cameras with a deviation of camera axis less than 3 degrees relative to vertical axis.
The vertical aerial survey is used for:
- urban development and the territory planning;
- land use control;;
- forestry management;
- environmental control;
- disaster and emergency monitoring and etc.
The benefits of the vertical aerial survey application:
- easy to generate high resolution orthophotos;
- high accuracy and detail;
- high performance;
- simultaneous data acquisition in several spectral bands.
Oblique survey it is when the camera axis is deliberately kept tilted from the vertical by a specified angle (more than 3 degrees). These images cannot be used for mapping because of their large-scale errors.
Oblique survey allows to see occluded in vertical images details. The main function of this type of survey is recognition.
The results of aerial survey
According to the acquisition method there are: frame aerial survey, strip aerial survey, general coverage survey.
Frame aerial survey – is the shooting of a series of separate frame images.
Strip aerial survey – is the shooting of a series of longitudinal overlapping images (usually 56-60%) to cover one long object.
General coverage survey – is the shooting of a series of overlapping strips to cover a large territory. The survey is carried out with fore-and-aft overlap of adjusted aerial scenes.
Aerial survey often completes the satellite remote sensing data to obtain more detailed images of particular objects and territories. SOVZOND Company implements individual Aerial survey projects.