Question

Factors controlling Relief displacement in an aerial photo.

Answer 1

${\huge {\mathfrak {Answer :-}}}$

➡️ Atmospheric conditions : The presence of particles (smoke or dust) and molecules of gases in the atmosphere tends to reduce contrast because of scattering, therefore, the best time photography is when the sky is clear (November-February).

➡️ Scale: Scale is the ratio of distances between two images on an aerial photograph and the actual distance between the same two points/ objects on the ground, in other words the ratio of f/h ( f- focal length of the camera lens and h- flying height above the mean terrain). Due to variations in flying height , the scales of different photographs may vary. Scale may also vary because of the effects of tilt and relief displacements.

➡️ Camera/Film/Filter combination: To ensure good image quality,modern distortion free cameras are used. Depending upon the requirements different lens/ focal length/ film/ filter combinations can be used.

➡️ Flight direction: Aerial photography is flown in strips to cover the designated area. It is advisable to keep the number of strips to minimum. The flight direction of strips is therefore kept along the length of the area.

That's it..