noun

1. A photograph taken from an aircraft of the ground below.

noun '''aerial survey

1. 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

noun

1. An airbase.

noun

1. a sighting device used for measuring angles

noun

1. 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.
2. The quadrant of an azimuth circle.

noun

1. Instrument for measuring azimuths. It is a graduated circle on a sight, gun carriage, searchlight, etc.