Aerial Survey - Terms Used in Aerial Survey

Terms Used in Aerial Survey

  • exposure station or air station
    the position of the optical centre of the camera at the moment of exposure.
  • flying height
    the eleveation of the exposure station above the datum (usually mean sea level).
  • altitude
    the vertical distance of the aircraft above the earth surface.
  • tilt
    the angle between the aerial camera and the line of flight.
  • tip
    the angle between the aerial camera and the horizontal axis perpendicular to the line of flight.
  • principal point
    the point of intersection of the optical axis of the areal camera with the photographical plane
  • isocentre
    the point on the areal photograph in which the bisector of the angle of tilt meets the photograph.
  • nadir point
    the image of the nadir, i.e. the point on the areal photograph where a plumbline dropped from the front nodal point pierces the photograph.
  • scale
    ratio of the focal length of the camera objective and the distance of the exposure station from the ground

Aerial surveys are used for:

  • Archaeology
  • Fishery surveys
  • Hydrocarbon exploration
  • Land survey
  • Mining
  • Monitoring wildlife and insect populations, called aerial census or sampling.
  • Monitoring vegetation and ground cover
  • Reconnaissance
  • Used in Transportation Projects in conjunction with Ground Surveys(Roadway, Bridge, Interstate)

Aerial survey uses a measuring camera where the elements of the interior orientation are known, but a camera that has much larger focal length and film and more lenses are used.

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