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Remote Sens. 2016, 8(5), 405;

First in-Flight Radiometric Calibration of MUX and WFI on-Board CBERS-4

Division of Remote Sensing, National Institute for Space Research—INPE, 12227-010 São José dos Campos, Brazil
Division of Geointelligence (EGI), Institute for Advanced Studies—IEAv/CTA, 12231-970 São José dos Campos, Brazil
Division of Mathematics and Physics, Universidade de Taubaté—UNITAU, 12201-970 Taubaté, Brazil
Office of Engineering Research, College of Engineering, South Dakota State University, Brookings, SD 57007, USA
Author to whom correspondence should be addressed.
Academic Editors: Richard Müller and Prasad S. Thenkabail
Received: 3 February 2016 / Revised: 5 April 2016 / Accepted: 5 May 2016 / Published: 11 May 2016
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Brazil and China have a long-term joint space based sensor program called China-Brazil Earth Resources Satellite (CBERS). The most recent satellite of this program (CBERS-4) was successfully launched on 7 December 2014. This work describes a complete procedure, along with the associated uncertainties, used to calculate the in-flight absolute calibration coefficients for the sensors Multispectral Camera (MUX) and Wide-Field Imager (WFI) on-board CBERS-4. Two absolute radiometric calibration techniques were applied: (i) reflectance-based approach and (ii) cross-calibration method. A specific site at Algodones Dunes region located in the southwestern portion of the United States of America was used as a reference surface. Radiometric ground and atmospheric measurements were carried out on 9 March 2015, when CBERS-4 passed over the region. In addition, a cross-calibration between both MUX and WFI on-board CBERS-4 and the Operational Land Imager (OLI) on-board Landsat-8 was performed using the Libya-4 Pseudo Invariant Calibration Site. The gain coefficients are now available: 1.68, 1.62, 1.59 and 1.42 for MUX and 0.379, 0.498, 0.360 and 0.351 for WFI spectral bands blue, green, red and NIR, respectively, in units of (W/(m2·sr·μm))/DN. These coefficients were determined with uncertainties lower than 3.5%. As a validation of these radiometric coefficients, cross-calibration was also undertaken. An evaluation of radiometric consistency was performed between the two instruments (MUX and WFI) on-board CBERS-4 and with the well calibrated Landsat-7 ETM+. Results show that the reflectance values match in all the analogous spectral bands within the specified calibration uncertainties. View Full-Text
Keywords: absolute calibration; CBERS-4; cross-calibration; Landsat; radiometric calibration; reflectance-based absolute calibration; CBERS-4; cross-calibration; Landsat; radiometric calibration; reflectance-based

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Pinto, C.; Ponzoni, F.; Castro, R.; Leigh, L.; Mishra, N.; Aaron, D.; Helder, D. First in-Flight Radiometric Calibration of MUX and WFI on-Board CBERS-4. Remote Sens. 2016, 8, 405.

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