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O

Object Based Image Analysis (OBIA)

OBIA is an image classification technique that segments images and classifies them using spectral, spatial, and relational properties and characteristics.

Off-nadir angle

The angle between the nadir and the ray of light between the sensor and the vertical object.

Off-nadir view

The view of any object not directly beneath a scanner's detectors or camera lens, but rather off at an angle; results in relief displacement.

Orbit

Path of a satellite around a body such as the earth, under the influence of gravity.

Orbit duration

Time elapsed for one complete satellite path around a body such the Earth.

Orthophotography

Aerial photography from which distortions owing to camera orientation and ground relief have been removed. An orthophoto has the same scale throughout and can be used as a map.

Orthorectification

Process by which imagery is geometrically corrected so that coordinates in the imagery accurately represent coordinates on the ground.