A photograph taken from an aircraft of the ground below.
noun '''aerial survey
a method of collecting information by utilizing aerial photography. or from remote sensing technology using other bands of the electromagnetic spectrum, such as infrared, gamma-ray, or ultraviolet
a sighting device used for measuring angles
An arc of the horizon intercepted between the meridian of the place and a vertical circle passing through the center of any object; as, the azimuth of a star; the azimuth or bearing of a line surveying.
The quadrant of an azimuth circle.
Instrument for measuring azimuths. It is a graduated circle on a sight, gun carriage, searchlight, etc.