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Method of collecting geophysical data from high altitude aircraft From Wikipedia, the free encyclopedia
Aerial survey is a method of collecting geomatics or other imagery data using airplanes, helicopters, UAVs, balloons, or other aerial methods. Typical data collected includes aerial photography, Lidar, remote sensing (using various visible and invisible bands of the electromagnetic spectrum, such as infrared, gamma, or ultraviolet) and geophysical data (such as aeromagnetic surveys and gravity measurements). It can also refer to a chart or map made by analyzing a region from the air. Aerial survey should be distinguished from satellite imagery technologies because of its better resolution, quality, and resistance to atmospheric conditions that can negatively impact and obscure satellite observation. Today, aerial survey is often recognized as a synonym for aerophotogrammetry, a part of photogrammetry where the camera is airborne. Measurements on aerial images are provided by photogrammetric technologies and methods.[1]
Aerial surveys can provide information on many things not visible from the ground.
Aerial surveys are used for:
Aerial surveys use a measuring camera where the elements of its interior orientation are known, but with much larger focal length and film and specialized lenses.
In order to carry out an aerial survey, a sensor needs to be fixed to the interior or exterior of the airborne platform with line-of-sight to the target; it is remotely sensing. With manned aircraft, this is accomplished either through an aperture in the skin of the aircraft or mounted externally on a wing strut. With unmanned aerial vehicles (UAVs), sensors are often mounted under or inside the vehicle, allowing for rapid data collection over challenging terrains, though sometimes with less precision than traditional methods.[3]
Aerial survey systems typically include the following components:
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