Research Papers

Absolute radiometric calibration of the RapidEye multispectral imager using the reflectance-based vicarious calibration method

[+] Author Affiliations
Denis Naughton

RapidEye AG, Molkenmarkt 30, 14776 Brandenburg an der Havel, Germanynaughton@rapideye.de

Andreas Brunn, Scott Douglass, Michael Thiele, Horst Weichelt, Michael Oxfort

RapidEye AG, Molkenmarkt 30, 14776 Brandenburg an der Havel, Germanynaughton@rapideye.de

Jeff Czapla-Myers

College of Optical Sciences, University of Arizona, 1630 E. University Boulevard, Tucson, Arizona 85721 j.czapla-myers@optics.arizona.edu

J. Appl. Remote Sens. 5(1), 053544 (August 12, 2011). doi:10.1117/1.3613950
History: Received October 20, 2010; Revised June 17, 2011; Accepted June 28, 2011; Published August 12, 2011; Online August 12, 2011
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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.

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© 2011 Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation

Denis Naughton ; Andreas Brunn ; Jeff Czapla-Myers ; Scott Douglass ; Michael Thiele, et al.
"Absolute radiometric calibration of the RapidEye multispectral imager using the reflectance-based vicarious calibration method", J. Appl. Remote Sens. 5(1), 053544 (August 12, 2011). ; http://dx.doi.org/10.1117/1.3613950


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