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Proceedings Paper

Design of an ultra-portable field transfer radiometer supporting automated vicarious calibration
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Paper Abstract

The University of Arizona Remote Sensing Group (RSG) began outfitting the radiometric calibration test site (RadCaTS) at Railroad Valley Nevada in 2004 for automated vicarious calibration of Earth-observing sensors. RadCaTS was upgraded to use RSG custom 8-band ground viewing radiometers (GVRs) beginning in 2011 and currently four GVRs are deployed providing an average reflectance for the test site. This measurement of ground reflectance is the most critical component of vicarious calibration using the reflectance-based method. In order to ensure the quality of these measurements, RSG has been exploring more efficient and accurate methods of on-site calibration evaluation. This work describes the design of, and initial results from, a small portable transfer radiometer for the purpose of GVR calibration validation on site. Prior to deployment, RSG uses high accuracy laboratory calibration methods in order to provide radiance calibrations with low uncertainties for each GVR. After deployment, a solar radiation based calibration has typically been used. The method is highly dependent on a clear, stable atmosphere, requires at least two people to perform, is time consuming in post processing, and is dependent on several large pieces of equipment. In order to provide more regular and more accurate calibration monitoring, the small portable transfer radiometer is designed for quick, one-person operation and on-site field calibration comparison results. The radiometer is also suited for laboratory calibration use and thus could be used as a transfer radiometer calibration standard for ground viewing radiometers of a RadCalNet site.

Paper Details

Date Published: 8 September 2015
PDF: 9 pages
Proc. SPIE 9607, Earth Observing Systems XX, 960709 (8 September 2015); doi: 10.1117/12.2186894
Show Author Affiliations
Nikolaus Anderson, College of Optical Sciences, The Univ. of Arizona (United States)
Kurtis Thome, NASA Goddard Space Flight Ctr. (United States)
Jeffrey Czapla-Myers, College of Optical Sciences, The Univ. of Arizona (United States)
Stuart Biggar, College of Optical Sciences, The Univ. of Arizona (United States)

Published in SPIE Proceedings Vol. 9607:
Earth Observing Systems XX
James J. Butler; Xiaoxiong (Jack) Xiong; Xingfa Gu, Editor(s)

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