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Proceedings Paper

Comparison of two methodologies for calibrating satellite instruments in the visible and near infrared
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Paper Abstract

Traditionally, satellite instruments that measure Earth-reflected solar radiation in the visible and near infrared wavelength regions have been calibrated for radiance response in a two-step method. In the first step, the spectral response of the instrument is determined using a nearly monochromatic light source, such as a lamp-illuminated monochromator. Such sources only provide a relative spectral response (RSR) for the instrument, since they do not act as calibrated sources of light nor do they typically fill the field-of-view of the instrument. In the second step, the instrument views a calibrated source of broadband light, such as a lamp-illuminated integrating sphere. In the traditional method, the RSR and the sphere spectral radiance are combined and, with the instrument's response, determine the absolute spectral radiance responsivity of the instrument. More recently, an absolute calibration system using widely tunable monochromatic laser systems has been developed. Using these sources, the absolute spectral responsivity (ASR) of an instrument can be determined on a wavelength-by-wavelength basis. From these monochromatic ASRs, the responses of the instrument bands to broadband radiance sources can be calculated directly, eliminating the need for calibrated broadband light sources such as integrating spheres. Here we describe the laser-based calibration and the traditional broad-band sourcebased calibration of the NPP VIIRS sensor, and compare the derived calibration coefficients for the instrument. Finally, we evaluate the impact of the new calibration approach on the on-orbit performance of the sensor.

Paper Details

Date Published: 28 October 2010
PDF: 19 pages
Proc. SPIE 7862, Earth Observing Missions and Sensors: Development, Implementation, and Characterization, 78620C (28 October 2010); doi: 10.1117/12.868356
Show Author Affiliations
Robert A. Barnes, Science Applications International Corp. (United States)
Steven W. Brown, National Institute of Standards and Technology (United States)
Keith R. Lykke, National Institute of Standards and Technology (United States)
Bruce Guenther, National Oceanic and Atmospheric Administration (United States)
Xiaoxiong Xiong, NASA Goddard Space Flight Ctr. (United States)
James J. Butler, NASA Goddard Space Flight Ctr. (United States)


Published in SPIE Proceedings Vol. 7862:
Earth Observing Missions and Sensors: Development, Implementation, and Characterization
Xiaoxiong Xiong; Choen Kim; Haruhisa Shimoda, Editor(s)

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