Information obtained by direct observation of a real system, as opposed to a model or simulation a set of data that is considered to be accurate and reliable, and is used to calibrate a model, algorithm, procedure, etc. as used to verify or calibrate remotely obtained data.Ģ. In remote sensing: information obtained by direct measurement at ground level, rather than by interpretation of remotely obtained data (as aerial or satellite images, etc.), esp. Also: the real or underlying facts information that has been checked or facts that have been collected at source.Ģ.
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