{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,12,8]],"date-time":"2025-12-08T22:19:05Z","timestamp":1765232345928,"version":"build-2065373602"},"reference-count":46,"publisher":"MDPI AG","issue":"5","license":[{"start":{"date-parts":[[2016,5,11]],"date-time":"2016-05-11T00:00:00Z","timestamp":1462924800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>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\u00b7sr\u00b7\u03bcm))\/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.<\/jats:p>","DOI":"10.3390\/rs8050405","type":"journal-article","created":{"date-parts":[[2016,5,11]],"date-time":"2016-05-11T10:53:59Z","timestamp":1462964039000},"page":"405","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":23,"title":["First in-Flight Radiometric Calibration of MUX and WFI on-Board CBERS-4"],"prefix":"10.3390","volume":"8","author":[{"given":"Cibele","family":"Pinto","sequence":"first","affiliation":[{"name":"Division of Remote Sensing, National Institute for Space Research\u2014INPE, 12227-010 S\u00e3o Jos\u00e9 dos Campos, Brazil"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5993-9053","authenticated-orcid":false,"given":"Fl\u00e1vio","family":"Ponzoni","sequence":"additional","affiliation":[{"name":"Division of Remote Sensing, National Institute for Space Research\u2014INPE, 12227-010 S\u00e3o Jos\u00e9 dos Campos, Brazil"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6873-9854","authenticated-orcid":false,"given":"Ruy","family":"Castro","sequence":"additional","affiliation":[{"name":"Division of Geointelligence (EGI), Institute for Advanced Studies\u2014IEAv\/CTA, 12231-970 S\u00e3o Jos\u00e9 dos Campos, Brazil"},{"name":"Division of Mathematics and Physics, Universidade de Taubat\u00e9\u2014UNITAU, 12201-970 Taubat\u00e9, Brazil"}]},{"given":"Larry","family":"Leigh","sequence":"additional","affiliation":[{"name":"Office of Engineering Research, College of Engineering, South Dakota State University, Brookings, SD 57007, USA"}]},{"given":"Nischal","family":"Mishra","sequence":"additional","affiliation":[{"name":"Office of Engineering Research, College of Engineering, South Dakota State University, Brookings, SD 57007, USA"}]},{"given":"David","family":"Aaron","sequence":"additional","affiliation":[{"name":"Office of Engineering Research, College of Engineering, South Dakota State University, Brookings, SD 57007, USA"}]},{"given":"Dennis","family":"Helder","sequence":"additional","affiliation":[{"name":"Office of Engineering Research, College of Engineering, South Dakota State University, Brookings, SD 57007, USA"}]}],"member":"1968","published-online":{"date-parts":[[2016,5,11]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"373","DOI":"10.1590\/S0001-37652008000200015","article-title":"In-flight absolute calibration of the CBERS-2 CCD sensor data","volume":"80","author":"Ponzoni","year":"2008","journal-title":"Ann. 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