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Journal of Applied Remote Sensing

Absolute radiometric calibration of the RapidEye multispectral imager using the reflectance-based vicarious calibration method
Author(s): Denis Naughton; Andreas Brunn; Jeffrey S. Czapla-Myers; Scott Douglass; Michael Thiele; Horst Weichelt; Michael Oxfort
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Paper Abstract

RapidEye AG is a commercial provider of geospatial information products and customized solutions derived from Earth observation image data. The source of the data is the RapidEye constellation consisting of five low-earth-orbit imaging satellites. We describe the rationale, methods, and results of a reflectance-based vicarious calibration campaign that was conducted between April 2009 and May 2010 at Railroad Valley Playa and Ivanpah Playa to determine the on-orbit radiometric accuracy of the RapidEye sensor. In situ surface spectral reflectance measurements of known ground targets and an assessment of the atmospheric conditions above the sites were taken during spacecraft overpasses. The ground data are used as input to a radiative transfer code to compute a band-specific top-of-atmosphere spectral radiance. A comparison of these predicted values based on absolute physical data to the measured at-sensor spectral radiance provide the absolute calibration of the sensor. Initial assessments show that the RapidEye sensor response is within 8% of the predicted values. Outcomes from this campaign are then used to update the calibration parameters in the ground segment processing system. Subsequent verification events confirmed that the measured RapidEye response improved to within 4% of the predictions based on the vicarious calibration method.

Paper Details

Date Published: 1 January 2011
PDF: 24 pages
J. Appl. Rem. Sens. 5(1) 053544 doi: 10.1117/1.3613950
Published in: Journal of Applied Remote Sensing Volume 5, Issue 1
Show Author Affiliations
Denis Naughton, RapidEye AG (Germany)
Andreas Brunn, RapidEye AG (Germany)
Jeffrey S. Czapla-Myers, College of Optical Sciences, The Univ. of Arizona (United States)
Scott Douglass, RapidEye AG (Germany)
Michael Thiele, RapidEye AG (Germany)
Horst Weichelt
Michael Oxfort

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