oblique aerial photograph

oblique aerial photograph [De].
Photographic image taken from an aircraft or similar high-level elevated platform where the camera direction is at an angle to the ground beneath. Such photographs do not need special equipment, and using carefully chosen views and good lighting can provide a good impression of a complicated set of remains. However, oblique aerial photographs distort perspective and cannot easily be used for plotting and mapping visible features without rectification. See also VERTICAL AERIAL PHOTOGRAPH.