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Radiometric Calibration for AgCam
The Northern Great Plains Center for People and the Environment, University of North Dakota, Grand Forks, ND 58202-9011,USA
Center for Earth Observation and Digital Earth, Chinese Academy of Sciences, Beijing 100012, P.R. China
Ocean Remote Sensing Institute, Ocean University of China, Qingdao, Shandong, 266003, P.R.China
Airborne Science and Technology Laboratory, NASA Ames Research Center, Moffett Field, CA 94035, USA
This work was done while Changyong Dou was a visiting student at the University of North Dakota, USA
* Author to whom correspondence should be addressed.
Received: 8 January 2010; in revised form: 25 January 2010 / Accepted: 26 January 2010 / Published: 1 February 2010
Abstract: 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.
Keywords: radiometric calibration; CCD quantum efficiency; vignetting; least squares fit; remote sensing
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Cite This Article
MDPI and ACS Style
Olsen, D.; Dou, C.; Zhang, X.; Hu, L.; Kim, H.; Hildum, E. Radiometric Calibration for AgCam. Remote Sens. 2010, 2, 464-477.
Olsen D, Dou C, Zhang X, Hu L, Kim H, Hildum E. Radiometric Calibration for AgCam. Remote Sensing. 2010; 2(2):464-477.
Olsen, Doug; Dou, Changyong; Zhang, Xiaodong; Hu, Lianbo; Kim, Hojin; Hildum, Edward. 2010. "Radiometric Calibration for AgCam." Remote Sens. 2, no. 2: 464-477.