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Digital aerial survey

Digital aerial survey is performed with the use of modern topographic mapping aerial survey systems of high productivity, geometric accuracy, spatial resolution and photometric radiometric image quality.

Aerial survey data obtained with the use of full large-format digital aerial cameras is presented in a set of colour and multispectral images in four spectral ranges (red, green, blue, near infrared). Imagery in spectral channels can be used for creation of spectrozonal color-infrared images (conditional false-colour images which reflect consist of near infrared channel and two selected channels of the visible spectral range), which possess high decoding interpretation features ability.

 

Colour aerial image

Conditional colour aerial image

Digital aerial survey is performed with the use of on-board positioning and orientation systems which allow direct in-flight determination of imagery horizontalization exterior orientation parameters and thus cutting of expenses on field aerial  ground control points referencing survey and the timing of work performance.

Apart from field aerial survey performed at the vertical position of a visual optical axis, oblique aerial survey (tilted visual optical axis) can be performed as well, which allows more efficient spotting recognition of objects and analyzing of their relative spatial position.

Digital aerial survey is efficiently applied for solution of the following tasks:

  • creation and updating of topographic and special plans maps;
  • creation of the mapping base for real estate cadastre;
  • ecology and nature management (agriculture and forestry);
  • monitoring of various objects;
  • creation of 3D models of objects and territories;
  • reaction to emergencies;
  • creation of visual information systems.

Advantages of digital aerial survey compared to analogue:

  • No photochemical processing, no need in a photo laboratory;
  • No aerial imagery scanning process;
  • No photo data deformation and geometric distortions of aerial images connected to it caused with it;
  • Higher photometric radiometric quality: no lost details in deep-shadows detalisation;
  • No need in innerior image orientation with use of fiducial marks on collimating points during photogrammetric processing;
  • No traces of mechanical damage and dust on images.