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Proceedings Paper

Low uncertainty measurements of bidirectional reflectance factor on the NPOESS/VIIRS solar diffuser
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Paper Abstract

An illuminated Solar Diffuser is the calibration source for the VIS/NIR bands on the NPOESS/VIIRS sensor. We completed a set of BRF measurements to fully characterize the distribution of scattered light from the solar diffuser. NPOESS/VIIRS has an overall VIS/NIR radiometric calibration uncertainty requirement of 2%(1 sigma), of which 1.32% was allocated to the characterization of the BRF. In order to meet this requirement, we modified the existing goniometer and measurement procedure used on MODIS. Modifications include sample yoke redesign, periodic measurements of the lamp polarization coupled with stability measurements, modifications to source optics, and stray light reduction. We measured BRF in 6 spectral wavebands for 9 out-of-plane illumination angles and 2 view angles. We achieved NIST traceable measurements with an uncertainty ranging from 1.09% to 1.32%. Our measurements of a smaller SpectralonTM sample match NIST measurements of the same sample to better than 0.5%. These requirements are nominally the same as achieved on MODIS. As a result of instrument upgrades, we currently meet this overall uncertainty while having included additional uncertainty terms.

Paper Details

Date Published: 12 October 2007
PDF: 15 pages
Proc. SPIE 6677, Earth Observing Systems XII, 66771O (12 October 2007); doi: 10.1117/12.753243
Show Author Affiliations
Kristen Lessel, Raytheon Santa Barbara Remote Sensing (United States)
Stephen McClain, Raytheon Santa Barbara Remote Sensing (United States)

Published in SPIE Proceedings Vol. 6677:
Earth Observing Systems XII
James J. Butler; Jack Xiong, Editor(s)

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