apparent thermal inertia (ATI) - An approximation of thermal inertia calculated as one minus albedo divided by the difference between daytime and nighttime

achromatic vision - The perception by the human eye of changes in brightness, often used to describe the perception of monochrome or black and white scenes.

angular resolving power -Minimum separation between two resolvable targets, expressed as angular separation.

atmospheric correction - Image-processing procedure that compensates for effects of selectivity scattered light in multispectral images.

forward overlap - The percent of duplication by successive photographs along a flight line.

geostationary orbit - An orbit at 41 000 km in the direction of the Earth’s rotation, which matches speed so that a satellite remains over a fixed point on the Earth’s surface.