PACE OCI straylight and crosstalk evaluation using Moon

Shihyan Lee; Frederick Patt; Robert E. Eplee; Jeffrey McIntire; Gerhard Meister

doi:10.1117/12.3039149

10 January 2025 PACE OCI straylight and crosstalk evaluation using Moon

Shihyan Lee, Frederick Patt, Robert E. Eplee, Jeffrey McIntire, Gerhard Meister

Author Affiliations +

Proceedings Volume 13267, Earth Observing Missions and Sensors: Development, Implementation, and Characterization VI; 132670E (2025) https://doi.org/10.1117/12.3039149
Event: Asia-Pacific Remote Sensing, 2024, Kaohsiung, Taiwan

Abstract

The Ocean Color Instrument (OCI) onboard NASA’s Plankton, Aerosol, Cloud, ocean Ecosystem (PACE) mission has performed three monthly lunar calibrations. The moon is an extended source over a large dark background, making it an ideal target for evaluating OCI’s straylight and crosstalk performance. The lunar data analysis showed the straylight and crosstalk to be lower than the prelaunch measurements, especially in the along-track direction, where very little straylight is detected. Based on lunar data, the prelaunch measured crosstalk coefficients were reduced, and a crosstalk correction was tested on both lunar and solar calibration data. Applying the revised crosstalk correction, the crosstalk contaminations are significantly reduced to under 0.1% at 2 to 3 pixels away from the lunar boundary for bands above 350nm. Below 350nm, the crosstalk correction residuals gradually increase due to a lack of high-quality prelaunch measurements. Lastly, applying the crosstalk correction changes the calibrated radiance for all science data. This is due to the different spectral shapes between the solar diffuser and the observed scenes. For the moon, the crosstalk correction has an impact of ~0.4% on the overall calibrated radiance for the 400 to 600nm bands and up to 20% impact on the UV bands.

Citation Download Citation

Shihyan Lee, Frederick Patt, Robert E. Eplee, Jeffrey McIntire, and Gerhard Meister "PACE OCI straylight and crosstalk evaluation using Moon", Proc. SPIE 13267, Earth Observing Missions and Sensors: Development, Implementation, and Characterization VI, 132670E (10 January 2025); https://doi.org/10.1117/12.3039149

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