in situ measurement

(1) a direct measurement of the measurand in its original place
(2) any sub-orbital measurement of the measurand

References: 

(1) ISO/TS 19159-1:2014(en), Geographic information - Calibration and validation of remote sensing imagery sensors and data — Part 1: Optical sensors

(2) CEOS Committee on Earth Observation Satellites (CEOS): Terms and Definitions and other documents and resources publicly available on http://calvalportal.ceos.org

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