Anais da Academia Brasileira de Ciências
Print version ISSN 0001-3765
PONZONI, Flávio J.; ZULLO JUNIOR, Jurandir and LAMPARELLI, Rubens A.C.. In-flight absolute calibration of the CBERS-2 CCD sensor data. An. Acad. Bras. Ciênc. [online]. 2008, vol.80, n.2, pp. 373-380. ISSN 0001-3765. http://dx.doi.org/10.1590/S0001-37652008000200015.
Since the first images of the sensors on board of CBERS-2 (China-Brazil Earth Resources Satellite) satellite were made available by the National Institute for Space Research (INPE), users have asked information about the conversion of image digital numbers to physical data (radiance or reflectance). This paper describes the main steps that were carried out to calculate the in-flight absolute calibration coefficients for CBERS-2 CCD level 2 (radiometric and geometric correction) images considering the reflectance-based method. Remarks about the preliminary evaluation of these coefficients application are also presented.
Keywords : absolute calibration; CBERS-2; CCD; reflectance.