PACE OCI lunar calibration: initial results

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

doi:10.1117/12.3027692

3 October 2024 PACE OCI lunar calibration: initial results

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

Proceedings Volume 13143, Earth Observing Systems XXIX; 131430N (2024) https://doi.org/10.1117/12.3027692
Event: Optical Engineering + Applications, 2024, San Diego, California, United States

Abstract

Launched in February 2024, the Ocean Color Instrument (OCI) onboard NASA’s Plankton, Aerosol, Cloud, ocean Ecosystem (PACE) mission has started performing its monthly lunar calibrations at ±7 degrees lunar phase angle in March 2024. In this paper, we will describe the OCI lunar calibration methodology and show the results of lunar calibration events during the initial months of PACE/OCI operation. A key difference of OCI lunar calibration from heritage sensors is that the lunar disk integrated irradiance is computed from lunar pixel radiance and sampling distance instead of the instrument’s IFOV. PACE provided a near constant sweep rate during lunar calibration allowing accurate determination of OCI pixel sampling extent. OCI performs lunar calibration in baseline science mode with 282 hyperspectral bands from 315 – 895 nm and 7 shortwave infrared bands (940 - 2260 nm). For each OCI band, we compute the integrated lunar disk irradiance, and compare the result with a lunar irradiance model (ROLO) prediction. The early results presented here clearly show that OCI’s lunar image acquisition is working as intended and will provide accurate data for OCI’s on-orbit radiometric characterization. The hyperspectral lunar irradiances provided by OCI are expected to become a valuable dataset for the evaluation of lunar irradiance models.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Shihyan Lee, Frederick Pratt, Robert E. Eplee, Jeffrey McIntire, and Gerhard Meister "PACE OCI lunar calibration: initial results", Proc. SPIE 13143, Earth Observing Systems XXIX, 131430N (3 October 2024); https://doi.org/10.1117/12.3027692

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