measurements conducted on the ground or at sea to calibrate, compare or verify observations made from satellites or aircraft

Verification of the accuracy of data by actual field investigation of areas that have been remotely sensed.

the use of a ground survey to confirm the findings of an aerial survey or to calibrate quantitative aerial observations.

site based verification of a field investigation that occurs simultaneously with remote sensing.

Remote sensing analysts must be sure that their image analysis is accurate. This is done by field where they go out to the actual places shown in the images and confirm that what they think they see on the image is actually true. (Related words: verification, calibration)