Radiometric Calibration for AgCam

Remote Sensing

Doug Olsen¹  Changyong Dou³  Xiaodong Zhang¹  Lianbo Hu²  Hojin Kim¹ 

[1] The Northern Great Plains Center for People and the Environment, University of North Dakota, Grand Forks, ND 58202-9011,USA; E-Mails:;Ocean Remote Sensing Institute, Ocean University of China, Qingdao, Shandong, 266003, P.R.China; E-Mail:;Center for Earth Observation and Digital Earth, Chinese Academy of Sciences, Beijing 100012, P.R. China; E-Mail:

关键词: radiometric calibration;    CCD quantum efficiency;    vignetting;    least squares fit;    remote sensing;   

DOI  :  10.3390/rs2020464

来源: mdpi

【 摘 要 】

The student-built Agricultural Camera (AgCam) now onboard the International Space Station observes the Earth surface through two linescan cameras with Charge-Coupled Device (CCD) arrays sensitive to visible and near-infrared wavelengths, respectively. The electro-optical components of the AgCam were characterized using precision calibration equipment; a method for modeling and applying these measurements was derived. Correction coefficients to minimize effects of optical vignetting, CCD non-uniform quantum efficiency, and CCD dark current are separately determined using a least squares fit approach. Application of correction coefficients yields significant variability reduction in flat-field images; comparable results are obtained when applied to ground test images.

【 授权许可】

CC BY   
© 2010 by the authors; licensee Molecular Diversity Preservation International, Basel, Switzerland.