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Radiometric calibration of the RapidEye Multispectral Imager (MSI) as with all other remote sensing instruments is an essential task\udin the quantitative assessment of sensor image quality and the production of accurate data products for a wide range of geo-spatial\udapplications. Spatially and temporally pseudo-invariant terrestrial targets have long been used to quantify and provide a consistent\udrecord of the radiometric performance of Earth observation systems. The RapidEye cross-calibration approach combines temporal\udand relative calibration to ensure temporal stability in spectral response between it's 5 identical MSI over time by using a large\udnumber of repetitive collects of many pseudo-invariant calibration sites. The approach is characterized by its known reliability which\udis based on the purely statistical analysis of many ground collects with ground infrastructure or measurement systems not being\udnecessary. The results show that the in-band percent difference in the measured response among all RapidEye sensors is less than\udtwo percent. Although the results show some offsets between the different sensors, the response of the RapidEye constellation over a\udthree-year period is very stable

the international archives of the photogrammetry, remote sensing and spatial information sciences/international archives of the photogrammetry, remote sensing and spatial information sciences

CROSS-CALIBRATION OF THE RAPIDEYE MULTISPECTRAL IMAGER PAYLOADS USING PSEUDO-INVARIANT TEST SITES