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21 December 1998 Characterization of the solar diffuser as the primary standard for onboard calibration of the Moderate Resolution Imaging Spectroradiometer
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Abstract
The Moderate Resolution Imaging Spectroradiometer (MODIS) will employ a solar illuminated diffuser as an on-board calibration device. The solar diffuser is Labsphere SpectralonTM. The bidirectional reflectance factor (BRF) of the solar diffuser panel is needed for the on-orbit reflectance calibrations. The BRF of the solar diffuser panel was measured using the Santa Barbara Remote Sensing scattering goniopolarimeter, which is a relative device, so a known BRF standard was required. The standard was a Spectralon sample that was calibrated by the National Institute of Standards and Technology. Its BRF was calibrated in the 400 to 1800 nm region. Total uncertainty estimates for the MODIS solar diffuser BRF were less than 1.0% for all wavebands other than the longest one, which was centered at 2100 nm. The estimated uncertainty for the 2100-nm waveband was 1.5%. Hapke scattering theory was used to generate models for the BRF. For the MODIS solar diffuser models, the root-mean-square of the fit values were less than 0.3%, for wavebands other than 2100 nm. They were less than 1.1% for the 2100-nm waveband.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Joe A. Walker Jr., Milutin M. Pavlov, and Michael L. Byers "Characterization of the solar diffuser as the primary standard for onboard calibration of the Moderate Resolution Imaging Spectroradiometer", Proc. SPIE 3498, Sensors, Systems, and Next-Generation Satellites II, (21 December 1998); https://doi.org/10.1117/12.333663
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