Dr. Boryana V. Efremova Profile

Dr. Boryana V. Efremova

Systems Engineer at GeoThinkTank LLC

SPIE Involvement:

Author

Publications (20)

Proceedings Article | 3 October 2024 Presentation + Paper

GSFC Calibration Laboratory improvement of broadband source calibration through continuous monitoring

Nathan Kelley, Boryana Efremova, Julia Barsi, Brendan McAndrew

Proceedings Volume 13143, 1314309 (2024) https://doi.org/10.1117/12.3029419

KEYWORDS: Lamps, Calibration, Optical spheres, Spectrometers, Free electron lasers, Equipment, Sensors, Radiometry, Radiometric calibration, Integrating spheres

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Proceedings Article | 3 October 2024 Presentation + Paper

A vacuum-compatible, spectrally tuneable, flat panel uniform source for testing large aperture earth observation systems

Jeffrey Holt, Julia Barsi, Theodore Schwarz, Eugene Waluschka, Mark Schwarz, Robert Bousquet, Craig Kent, Paul Mascia, Robert Lambeck, Luke Dobrowski, Boryana Efremova, Dan Scharpf

Proceedings Volume 13143, 1314306 (2024) https://doi.org/10.1117/12.3023845

KEYWORDS: Vacuum, Equipment, Satellites, Light emitting diodes, Vacuum chambers, Light sources and illumination, Spectrometers, Optical spheres, Light sources, Calibration

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Proceedings Article | 4 October 2023 Presentation + Paper

GSFC Calibration Laboratory capabilities and future plans overview

Nathan Kelley, Joel McCorkel, Erich Wanzek, Georgie Georgiev, Julia Barsi, Brendan McAndrew, Boryana Efremova

Proceedings Volume 12685, 126850B (2023) https://doi.org/10.1117/12.2681380

KEYWORDS: Calibration, Optical spheres, Lamps, Radiometry, Diffusers, Radiometric calibration, Equipment, Tunable lasers, Spectral calibration, Free electron lasers

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SPIE Journal Paper | 13 September 2022

Geostationary operational environmental satellite-R advanced baseline imager reflective solar band absolute validation using Sonoran desert scenes

Aaron Pearlman, Francis Padula, Monica Cook, Boryana Efremova, Joel McCorkel, Xiaoxiong Xiong

JARS, Vol. 16, Issue 03, 034530, (September 2022) https://doi.org/10.1117/12.10.1117/1.JRS.16.034530

KEYWORDS: Satellites, Bidirectional reflectance transmission function, Reflectivity, Sensors, Satellite imaging, MODIS, Imaging systems, Clouds, Earth observing sensors, Radiative transfer

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Proceedings Article | 20 September 2020 Presentation + Paper

Mitigating the GOES-17 ABI thermal anomaly using predictive calibration

David Pogorzala, Jon Fulbright, Elizabeth Kline, Boryana Efremova, Joel McCorkel, John Van Naarden

Proceedings Volume 11530, 115300O (2020) https://doi.org/10.1117/12.2574160

KEYWORDS: Calibration, Sensors, Temperature metrology, Imaging systems, Cooling systems, Detection and tracking algorithms, Image quality

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The GOES-17 Advanced Baseline Imager (ABI) has an anomaly with its on-board cooling system that prevents it from maintaining its Focal Plane Modules (FPMs) at cold, optimal temperatures. Because of this, during certain times of the year the FPMs and their detectors warm and cool throughout the day. Changing the detectors’ temperature changes their response to incoming radiance, which leads to calibration errors over time and degrades the imagery. Numerous mitigation strategies have been implemented to reduce the solar insolation on the instrument and to mitigate image degradation, including semi-annual yaw flips and changing the integration time of the detectors twice daily. These and other mitigations all work with the baseline calibration algorithms currently in place on the GOES-R Ground System. In an attempt to reduce the image degradation even further, the ABI vendor designed a new calibration scheme that predicts key parameters forward in time to account for the drifting FPM temperatures. These parameters, the linear gain term and dark current scene, are nominally updated on orbit every 5 minutes and 30 seconds, respectively. However, even at these relatively short cadences the detectors can change temperature, thereby rendering the parameters invalid for accurate calibration. By projecting these parameters forward in time the radiometric bias is reduced and image quality improves. This Predictive Calibration modification was deployed to operations on July 25, 2019, following several months of extensive testing and optimization by the GOES-R science teams. During this time several parameters and thresholds were tuned to ensure Predictive Calibration was turning on and off at the optimal times. Since going into operations users have seen noticeable improvement to the imagery and its calibration. This paper will discuss the fundamental assumptions behind the baseline equations and highlight the changes introduced by Predictive Calibration. Results will show the improvements to the calibration of the operational L1b products and reduction in image degradation.

Proceedings Article | 14 September 2020 Presentation + Paper

Validation of GOES-17 ABI reflective channels performance: Salar de Uyuni 2018 field campaign results

Boryana Efremova, Joel McCorkel, Alexander Krimchansky, Jason Hair, Marcos Andrade

Proceedings Volume 11501, 115011B (2020) https://doi.org/10.1117/12.2568601

KEYWORDS: Reflectivity, Atmospheric modeling, Calibration, Sensors, Imaging systems, In situ metrology, Radiative transfer, Target detection

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Proceedings Article | 7 September 2018 Presentation + Paper

Landsat 9 Thermal Infrared Sensor 2 pre-launch characterization: initial imaging and spectral performance results

Aaron Pearlman, Joel McCorkel, Matthew Montanaro, Boryana Efremova, Brian Wenny, Allen Lunsford, Amy Simon, Jason Hair, Dennis Reuter

Proceedings Volume 10764, 1076406 (2018) https://doi.org/10.1117/12.2321084

KEYWORDS: Stray light, Signal detection, Sensors, Earth observing sensors, Landsat, Calibration, Infrared sensors, Spectral calibration, Spatial analysis, Image resolution

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Proceedings Article | 5 September 2017 Presentation + Paper

Early radiometric calibration performances of GOES-16 advanced baseline imager

Fangfang Yu, Xiangqian Wu, Xi Shao, Boryana Efremova, Hyelim Yoo, Haifeng Qian, Bob Iacovazzi

Proceedings Volume 10402, 104020S (2017) https://doi.org/10.1117/12.2275195

KEYWORDS: Calibration, Satellites, Imaging systems, Meteorological satellites, Weather forecasting, Environmental sensing, Climatology, Diffusers, Black bodies, Visible radiation

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Proceedings Article | 19 September 2016 Presentation + Paper

Detector level ABI spectral response function: FM4 analysis and comparison for different ABI modules

Boryana Efremova, Aaron Pearlman, Frank Padula, Xiangqian Wu

Proceedings Volume 9972, 99720S (2016) https://doi.org/10.1117/12.2238090

KEYWORDS: Sensors, Calibration, Imaging systems, Fermium, Reflectivity, Lithium, Liquid crystals, Spectral calibration, Vegetation, Surface plasmons

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Proceedings Article | 8 September 2015 Paper

JPSS-1 VIIRS pre-launch radiometric performance

Hassan Oudrari, Jeff McIntire, Xiaoxiong Xiong, James Butler, Boryana Efremova, Qiang Ji, Shihyan Lee, Tom Schwarting

Proceedings Volume 9607, 960710 (2015) https://doi.org/10.1117/12.2188257

KEYWORDS: Sensors, Calibration, Signal to noise ratio, Polarization, Seaborgium, Reflectivity, Attenuators, Long wavelength infrared, Stray light, Infrared sensors

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Proceedings Article | 8 September 2015 Paper

A robust method for determining calibration coefficients for VIIRS reflective solar bands

Qiang Ji, Jeffrey McIntire, Boryana Efremova, Thomas Schwarting, Hassan Oudrari, Jinan Zeng, Xiaoxiong Xiong

Proceedings Volume 9607, 960719 (2015) https://doi.org/10.1117/12.2188443

KEYWORDS: Calibration, Sensors, Attenuators, Light sources, Transmittance, Reflectivity, Visualization, Satellite imaging, Satellites, Imaging systems

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Proceedings Article | 19 November 2014 Paper

The solar vector error within the SNPP Common GEO code, the correction, and the effects on the VIIRS SDR RSB calibration

Jon Fulbright, Samuel Anderson, Ning Lei, Boryana Efremova, Zhipeng Wang, Jeffrey McIntire, Kwofu Chiang, Xiaoxiong Xiong

Proceedings Volume 9264, 92641T (2014) https://doi.org/10.1117/12.2074598

KEYWORDS: Calibration, Space operations, Sun, Sensors, Short wave infrared radiation, Bidirectional reflectance transmission function, Vignetting, Diffusers, Reflectivity, Data processing

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Proceedings Article | 26 September 2014 Paper

Using the moon to evaluate the radiometric calibration performance of S-NPP VIIRS thermal emissive bands

Zhipeng Wang, Xiaoxiong Xiong, Boryana Efremova, Hongda Chen

Proceedings Volume 9218, 92181W (2014) https://doi.org/10.1117/12.2062210

KEYWORDS: Calibration, Sensors, MODIS, Reflectivity, Sun, Black bodies, Satellites, Long wavelength infrared, Solar energy, Infrared imaging

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Proceedings Article | 26 September 2014 Paper

Relative spectral response corrected calibration inter-comparison of S-NPP VIIRS and Aqua MODIS thermal emissive bands

Boryana Efremova, Aisheng Wu, Xiaoxiong Xiong

Proceedings Volume 9218, 92180G (2014) https://doi.org/10.1117/12.2061917

KEYWORDS: MODIS, Calibration, Temperature metrology, Satellites, Infrared radiation, Visible radiation, Infrared imaging, Spectral calibration, Radiometry, Black bodies

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Proceedings Article | 26 September 2014 Paper

CLARREO calibration uncertainty assessment tool: status and path forward

Boryana Efremova, Aisheng Wu, Xiaoxiong Xiong, James Butler

Proceedings Volume 9218, 92181U (2014) https://doi.org/10.1117/12.2061962

KEYWORDS: Sensors, Sun, Reflectivity, Calibration, Remote sensing, Attenuators, Stray light, Climate change, Environmental sensing, Climatology

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Proceedings Article | 23 September 2013 Paper

Improving the characterization and performance of the Suomi-NPP VIIRS solar diffuser stability monitor

Jon Fulbright, Ning Lei, Jeffrey McIntire, Boryana Efremova, Xuexia Chen, Xiaoxiong Xiong

Proceedings Volume 8866, 88661J (2013) https://doi.org/10.1117/12.2024322

KEYWORDS: Sun, Sensors, Signal to noise ratio, Diffusers, Calibration, Bidirectional reflectance transmission function, Vignetting, Detection and tracking algorithms, Ultraviolet radiation, Aerospace engineering

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Proceedings Article | 19 November 2012 Paper

Calibration of NPP VIIRS fire detection band using lunar observations

Jeff McIntire, Boryana Efremova, Xiaoxiong Xiong

Proceedings Volume 8533, 85331B (2012) https://doi.org/10.1117/12.971228

KEYWORDS: Calibration, Sensors, Flame detectors, Black bodies, Space operations, Sun, Thermography, Radiometry, Visible radiation, Infrared detectors

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Proceedings Article | 19 November 2012 Paper

Comparison of MODIS and VIIRS On-board blackbody Performance

Xiaoxiong Xiong, Jim Butler, Aisheng Wu, Kwofu Chiang, Boryana Efremova, Sriharsha Madhavan, Jeff McIntire, Hassan Oudrari

Proceedings Volume 8533, 853318 (2012) https://doi.org/10.1117/12.977560

KEYWORDS: MODIS, Calibration, Sensors, Black bodies, Temperature metrology, Staring arrays, Space operations, Radiometry, Mirrors

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Proceedings Article | 15 October 2012 Paper

Analysis of Suomi–NPP VIIRS vignetting functions based on yaw maneuver data

Jeff McIntire, Boryana Efremova, David Moyer, Shihyan Lee, Xiaoxiong Xiong

Proceedings Volume 8510, 85101K (2012) https://doi.org/10.1117/12.930127

KEYWORDS: Sensors, Calibration, Bidirectional reflectance transmission function, Vignetting, Reflectivity, Signal attenuation, Radiometry, Sun, Ultraviolet radiation, MODIS

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Proceedings Article | 15 October 2012 Paper

VIIRS thermal emissive bands calibration algorithm and on-orbit performance

D. Moyer, J. McIntire, F. De Luccia, B. Efremova, K. Chiang, X. Xiong

Proceedings Volume 8510, 85101D (2012) https://doi.org/10.1117/12.930145

KEYWORDS: Calibration, Sensors, Temperature metrology, Black bodies, Reflectivity, Detection and tracking algorithms, Space operations, Atmospheric sensing, Sensor performance, Staring arrays

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Showing 5 of 20 publications

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