0

Full Content is available to subscribers

Subscribe/Learn More  >
Proceedings Article

SeaWiFS Detector and Gain Calibrations: Four Years of On-Orbit Stability

[+] Author Affiliations
Robert E. Eplee, Jr., Robert A. Barnes

Science Applications International Corp. and NASA Goddard Space Flight Ctr. (USA)

Charles R. McClain

NASA Goddard Space Flight Ctr. (USA)

Proc. SPIE 4814, Earth Observing Systems VII, 282 (September 25, 2002); doi:10.1117/12.450565
Text Size: A A A
From Conference Volume 4814

  • Earth Observing Systems VII
  • William L. Barnes
  • Seattle, WA | July 07, 2002

abstract

The SeaWiFS Project uses daily on-orbit detector and gain calibrations to address issues which arise from the bilinear gain in the SeaWiFS radiometric response function. The bilinear gains provide high sensitivity over the ocean while preventing saturation over clouds or land. The bilinear gains are implemented by averaging the output from three high-sensitivity ocean detectors and one low-sensitivity cloud detector for each band. The calibration issues are: 1) the applicability of time corrections computed from lunar data obtained at one set of instrument gains to ocean data obtained at a different set of gains; and 2) the applicability of time corrections computed from data obtained with all four detectors in each band to the cloud detector alone. The Project uses the gain calibration to monitor the SeaWiFS gain ratios over time. The gain ratios for each detector are computed from measurements at each gain of a constant voltage injected into the post-detector electronics. The gain ratios are stable to within 0.1% over the course of the mission. The Project uses the detector calibrations to compare the response of individual detectors within each band to the response of the four detectors in that band. The detector response is monitored during a modified solar calibration where measurements are obtained from each detector. The departure of the cloud detectors from the four detectors is less than 0.5% for all eight bands. These analyses show that, for SeaWiFS, the time corrections derived from lunar calibrations are applicable to both ocean and land data.

© (2002) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Robert E. Eplee, Jr. ; Robert A. Barnes and Charles R. McClain
"SeaWiFS Detector and Gain Calibrations: Four Years of On-Orbit Stability", Proc. SPIE 4814, Earth Observing Systems VII, 282 (September 25, 2002); doi:10.1117/12.450565; http://dx.doi.org/10.1117/12.450565


Access This Article
Sign In to Access Full Content
Please Wait... Processing your request... Please Wait.
Sign in or Create a personal account to Buy this article ($15 for members, $18 for non-members).
 

Figures

Tables

NOTE:
Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging & repositioning the boxes below.

Related Book Chapters

Topic Collections

Advertisement


Buy this article ($18 for members, $25 for non-members).
Sign In