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You searched on: Author: Bettye Johnson

Displaying records 1 to 10 of 158 records.
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1. CALIBRATION AND CHARACTERIZATION OF A SEAPRISM RADIOMETER FOR AERONET-OC
Published: 6/19/2015
Authors: Bettye C Johnson, Steven W Brown, John Taylor Woodward IV, Keith R Lykke, Giuseppe Zibordi
Abstract: The global Aerosol Robotic Network for Ocean Color (AERONET-OC) program utilizes AERONET CE-318 sun photometers (termed ,SeaPRISMsŠ) modified for in-air observations of ocean waters situated on oil drilling rigs, off-shore lighthouses, or other platf ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=918818

2. Dedicated NOAA/JPSS VIIRS Ocean Color Calibration/Validation Cruise
Published: 6/12/2015
Authors: Bettye C Johnson, Michael Ondrusek, Eric Stengel, Veronica P. Lance, Menghua Wang, Kenneth Voss, Giuseppe Zibordi, Marko Talone, Zhongping Lee, Jianwei Wei, Junfang Lin, Chuanmin Hu, David English, Charles Kovach, Jennifer Cannizzaro, Alex Gilerson, Sam Ahmed, Ahmed El-Habashi, Robert Foster, Robert Arnone, Ryan Vandermeulen, Sherwin Ladner, Wesley Goode, Joaquim I Goes, Helga de Rosario Gomes, Alex Chekalyuk, Kali McKee, Scott Freeman, Aimee Neeley, Amir Ibrahim
Abstract: The NOAA/STAR Ocean Color team is focused on ,end-to-endŠ production of ocean color satellite products. In situ validation of satellite data is essential to producing the high-quality products required and expected by the international ocean color re ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=918908

3. System Vicarious Calibration for Ocean Color Climate Change Applications: Requirements for In Situ Data
Published: 3/15/2015
Authors: Giuseppe Zibordi, Frederic Melin, Kenneth Voss, Bettye C Johnson, Bryan Franz, Ewa Kwiatkowska, J. P. Huot, Menghua Wang, David Antoine
Abstract: System Vicarious Calibration (SVC) ensures a relative radiometric calibration to satellite ocean color sensors that minimizes uncertainties in the water-leaving radiance Lw derived from the top of atmosphere radiance LT. This is achieved through the ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=917320

4. Principles of Optical Radiometry and Measurement Uncertainty
Published: 11/27/2014
Authors: Bettye C Johnson, Howard W Yoon, Joseph Paul Rice, Albert C Parr
Abstract: The fundamental concepts of optical radiometry are developed from basic principles, with detailed explanations for radiance, irradiance, and reflectance. Examples of radiometric standards, in particular radiometers and reference sources are given, an ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915699

5. Validation of Spectral Radiance Assignments to Integrating Sphere Radiance Standards for the Advanced Baseline Imager
Published: 9/22/2014
Authors: Bettye C Johnson, Stephen E Maxwell, Eric L Shirley, Kim Slack, Gary Graham
Abstract: The Advanced Baseline Imager (ABI) is the next generation imaging sensor for NOAA‰s operational meteorological satellites in geostationary orbit. One pathway for traceability of the visible and near infrared radiometric response for ABI is to a 1.65 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=916420

6. Optical Passive Sensor Calibration for Satellite Remote Sensing and the Legacy of NOAA and NIST Cooperation
Series: Journal of Research (NIST JRES)
Report Number: 119.008
Published: 6/26/2014
Authors: Raju VSNU Datla , Michael Weinreb, Joseph Paul Rice, Bettye C Johnson, Eric L Shirley, Changyong Cao
Abstract: This paper traces the cooperative effort of the scientists at the National Oceanic and Atmospheric Administration (NOAA) and the National Institute of Standards and Technology (NIST) for improving the calibration of operational satellite sensors ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914026

7. Results of aperture area comparisons for exo-atmospheric total solar irradiance measurements
Published: 11/13/2013
Authors: Bettye C Johnson, Maritoni Abatayo Litorja, Joel B. Fowler, Eric L Shirley, James J Butler, Robert A Barnes
Abstract: Exo-atmospheric solar irradiance measurements made by the solar irradiance community since 1978 incorporate limiting apertures with diameters measured by a number of metrology laboratories using a variety of techniques. Knowledge of the aperture are ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913537

8. Validation of the dissemination of spectral irradiance values using FEL lamps
Published: 9/27/2012
Authors: Bettye C Johnson, Gary D. Graham, Robert D. Saunders, Howard W Yoon, Eric L Shirley
Abstract: Scales of spectral irradiance are disseminated from NIST by assignment of values to FEL-type lamp standards for defined conditions. These lamp standards can be used for absolute calibration of irradiance radiometers, or more typically, be used in con ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911954

9. Stray light correction algorithm for multi-spectral hyperspectral spectrographs
Published: 6/1/2012
Authors: Michael Feinholz, Stephanie J Flora, Steven W Brown, Yuqin Zong, Keith R Lykke, Mark A. Yarbrough, Bettye C Johnson, D. K. Clark
Abstract: An algorithm is developed to correct a multi-channel fiber-coupled spectrograph for stray or scattered light within the system. The efficacy of the algorithm is evaluated based on a series of validation measurements of sources with different spectra ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909987

10. The use of filtered photodetectors for radiance measurement
Series: Journal of Research (NIST JRES)
Report Number: 116.018
Published: 10/31/2010
Authors: Albert C Parr, Bettye C Johnson
Abstract: A methodology for using a calibrated filter radiometer to measure and monitor the spectral radiance of calibration sources is described. An example using a calibration sphere used by NIST for its remote sensing program is presented.
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907775



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