JPSS1 VIIRS RSB Sensor Calibration Using Monochromater-based and Laser-based Methods

We report spectral calibration results of visible and near infrared array sensors of JPSS1 VIIRS in the reflective solar band (RSB). The relative and absolute spectral responsivities are studied detector-by-detector, and band-averaging of each band by comparing the results of monochromater-based (SpMA) and laser-based calibration methods (T-SIRCUS). The comparison of spectral responsivities from SpMA and T-SIRCUS is associated with change of spectral shape, difference of central wavelength, and responsivity variation within certain spectral range of interest. The spatial dependence of centroid wavelength over 16 detectors for each band is also examined using the results from the two different calibration approaches. The relative and absolute spectral responsivities from both methods are shown for in-band and out-of-band spectral regions in order to investigate optical and electrical cross-talks since there is a contribution of out-of-band to be roughly up to 3% observed on the SNPP RSB sensors. We will also demonstrate a detailed cross-talk contribution to a specific feature on each band, and consider the correction related to other bands due to band-to-band cross-talk when viewing different scenes.