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Absolute Calibration Accuracy for Hyperspectral Imagers in the Solar ReflectiveThe characterization and calibration of hyperspectral imagers is a challenging one that is expected to become even more challenging as needs increase for highly-accurate radiometric data from such systems. The preflight calibration of the Advanced Responsive Tactically Effective Military Imaging Spectrometer (ARTEMIS) is used as an example of the difficulties to calibrate hyperspectrally. Results from a preflight solar radiation-based calibration are presented with a discussion of the uncertainties in such a method including the NISI-traceable and SItraceable aspects. Expansion on the concept of solar-based calibration is given with descriptions of methods that view the solar disk directly, illuminate a solar diffuser that is part of the sensor's inflight calibration, and illuminate an external diffuser that is imaged by the sensor. The results of error analysis show that it is feasible to achieve preflight calibration using the sun as a source at the same level of uncertainty as those of lamp-based approaches. The error analysis is evaluated and verified through the solar-radiation-based calibration of several of laboratory grade radiometers. Application of these approaches to NASA's upcoming CLARREO mission are discussed including proposed methods for significantly reducing the uncertainties to allow CLARREO data to be used for climate data records.
Document ID
20090026974
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Thome, Kurtis
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 24, 2013
Publication Date
June 16, 2009
Subject Category
Solar Physics
Meeting Information
Meeting: 31st Review of the Atmospheric Transmission Models Meeting
Location: Lexington, MA
Country: United States
Start Date: June 16, 2009
End Date: June 17, 2009
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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