Characterization of the solar diffuser as the primary standard for onboard calibration of the Moderate Resolution Imaging Spectroradiometer

Details Characterization of the solar diffuser as the primary standard for onboard calibration of the Moderate Resolution Imaging Spectroradiometer Characterization of the solar diffuser as the primary standard for onboard calibration of the Moderate Resolution Imaging Spectroradiometer

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998spie.3498..496w&link_type=abstract

Proc. SPIE Vol. 3498, p. 496-508, Sensors, Systems, and Next-Generation Satellites II, Hiroyuki Fujisada; Ed.

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Scientific paper

The Moderate Resolution Imaging Spectroradiometer (MODIS) will employ a solar illuminated diffuser as an on-board calibration device. The solar diffuser is Labsphere Spectralon(superscript TM). 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.

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