Extended Pseudo Invariant Calibration Site-Based Trend-to-Trend Cross-Calibration of Optical Satellite Sensors

Satellite sensors have been extremely useful and are in massive demand the understanding of Earth’s surface monitoring changes. For quantitative analysis acquiring consistent measurements, absolute radiometric calibration is necessary. The most common vicarious approach cross-calibration, which helps to tie all a scale for measurement. One traditional methods cross-calibration performed using temporally spectrally stable pseudo-invariant sites (PICS). This technique limited by adequate cloud-free acquisitions would require longer time study differences sensor measurements. To address limitation PICS-based approaches increase opportunity quickly achieving high-quality results, presented here based on extended pseudo invariant (EPICS) over North Africa. With EPICS-based approach, area extent site covers large portion African continent. targets this large, many should image some EPICS nearlydaily, allowing evaluation performance with much greater frequency. By these near-daily trends sensor’s then used evaluate sensor-to-sensor daily cross-calibration. use proposed methodology, dataset increased an order magnitude compared approaches, resulting between any two being detected within shorter time. Using new trend gains were evaluated Landsat 7/8 Sentinel 2A/B, results showing that calibrated 2.5% (within less than 8% uncertainty) or better pairs, what detects. cross-calibrate without requirement coincident near-coincident scene while still similar short