title: Pre-Launch Absolute Calibration of CCD/CBERS-2B Sensor.
abstract: Pre-launch absolute calibration coefficients for the CCD/CBERS-2B sensor have been calculated from radiometric measurements performed in a satellite integration and test hall in the Chinese Academy of Space Technology (CAST) headquarters, located in Beijing, China. An illuminated integrating sphere was positioned in the test hall facilities to allow the CCD/CBERS-2B imagery of the entire sphere aperture. Calibration images were recorded and a relative calibration procedure adopted exclusively in Brazil was applied to equalize the detectors responses. Averages of digital numbers (DN) from these images were determined and correlated to their respective radiance levels in order to calculate the absolute calibration coefficients. It has been the first time these pre-launch absolute calibration coefficients have been calculated considering the Brazilian image processing criteria. Now it will be possible to compare them to those that will be calculated from vicarious calibration campaigns. This comparison will permit the CCD/CBERS-2B monitoring and the frequently data updating to the user community.
authors.affiliation: Instituto Nacional de Pesquisas Espaciais, Divisão de Sensoriamento Remoto, Avenida dos Astronautas 1758, 12227-010, São José dos Campos, SP, Brazil. flavio@dsr.inpe.br.
authors.forename: Flávio Jorge
authors.initials: FJ
authors.lastname: Ponzoni
authors.affiliation: Instituto Nacional de Pesquisas Espaciais, Divisão de Engenharia Aeroespacial, Avenida dos Astronautas 1758, 12227-010, São José dos Campos, SP, Brazil. braulio@dea.inpe.br.
authors.forename: Bráulio Fonseca Carneiro
authors.initials: BF
authors.lastname: Albuquerque
keywords: Absolute calibration; CCD/CBERS-2B sensor; pre-launch calibration