This part of ISO 19159 defines the calibration and validation of airborne and spaceborne remote sensing imagery sensors. The term ??calibration?? refers to geometry@ radiometry@ and spectral@ and includes the instrument calibration in a laboratory as well as in situ calibration methods. The validation methods address validation of the calibration information. This part of ISO 19159 also addresses the associated metadata related to calibration and validation which have not been defined in other geographic information International Standards. The specified sensors include optical sensors of the frame camera and line camera types (2D CCD scanners).