Dr. Allen W. Lunsford Profile

Dr. Allen W. Lunsford

at NASA Goddard Space Flight Ctr

SPIE Involvement:

Author

Publications (10)

Proceedings Article | 26 October 2018 Presentation + Paper

Nature of and lessons learned from Lunar Ice Cube and the first deep space cubesat 'cluster'

Pamela Clark, Robert MacDowall, William Farrell, Cliff Brambora, Al Lunsford, Terry Hurford, David Folta, Benjamin Malphrus, Matt Grubb, Sarah Wilzcewski, Emily Bujold

Proc. SPIE. 10769, CubeSats and NanoSats for Remote Sensing II

KEYWORDS: Staring arrays, Imaging systems, Spectroscopy, Control systems, Infrared spectroscopy, Data archive systems, Telecommunications, Space operations, Solar processes, Absorption

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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

Proc. SPIE. 10764, Earth Observing Systems XXIII

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

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Proceedings Article | 26 September 2017 Presentation

Imaging and spectral performance of the New Horizons Ralph instrument during the 2015 Pluto encounter (Conference Presentation)

Allen Lunsford, Dennis Reuter, Donald Jennings, Catherine Olkin, S. Alan Stern, Gerald Weigle

Proc. SPIE. 10401, Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems

KEYWORDS: Staring arrays, Telescopes, Visible radiation, Fabry–Perot interferometers, Imaging systems, Cameras, Data processing, Spectral resolution, Imaging arrays, Pluto

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Proceedings Article | 2 October 2014 Paper

Chasing the TIRS ghosts: calibrating the Landsat 8 thermal bands

John Schott, Aaron Gerace, Nina Raqueno, Emmett Ientilucci, Rolando Raqueno, Allen Lunsford

Proc. SPIE. 9218, Earth Observing Systems XIX

KEYWORDS: Telescopes, Statistical analysis, Landsat, Sensors, Calibration, Solids, Black bodies, Chemical elements, Stray light, Earth observing sensors

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The Thermal Infrared Sensor (TIRS) on board Landsat 8 has exhibited a number of anomalous characteristics that have made it difficult to calibrate. These anomalies include differences in the radiometric appearance across the blackbody pre- and post-launch, variations in the cross calibration ratios between detectors that overlap on adjacent arrays (resulting in banding) and bias errors in the absolute calibration that can change spatially/temporally. Several updates to the TIRS calibration procedures were made in the months after launch to attempt to mitigate the impact of these anomalies on flat fielding (cosmetic removal of banding and striping) and mean level bias correction. As a result, banding and striping variations have been reduced but not eliminated and residual bias errors in band 10 should be less than 2 degrees for most targets but can be significantly more in some cases and are often larger in band 11. These corrections have all been essentially ad hoc without understanding or properly accounting for the source of the anomalies, which were, at the time unknown. This paper addresses the procedures that have been undertaken to; better characterize the nature of these anomalies, attempt to identify the source(s) of the anomalies, quantify the phenomenon responsible for them, and develop correction procedures to more effectively remove the impacts on the radiometric products. Our current understanding points to all of the anomalies being the result of internal reflections of energy from outside the target detector’s field-of-view, and often outside the telescope field-of-view, onto the target detector. This paper discusses how various members of the Landsat calibration team discovered the clues that led to how; these “ghosts” were identified, they are now being characterized, and their impact can hopefully eventually be corrected. This includes use of lunar scans to generate initial maps of influence regions, use of long path overlap ratios to explore sources of change and use of variations in bias calculated from truth sites to quantify influences from the surround on absolute bias errors.

Proceedings Article | 2 October 2014 Paper

Performance of the Thermal Infrared Sensor on-board Landsat 8 over the first year on-orbit

Matthew Montanaro, Julia Barsi, Allen Lunsford, Scott Rohrbach, Brian Markham

Proc. SPIE. 9218, Earth Observing Systems XIX

KEYWORDS: Staring arrays, Infrared sensors, Landsat, Data modeling, Sensors, Calibration, Stray light, Signal detection, Earth observing sensors, Temperature metrology

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Proceedings Article | 23 September 2013 Paper

Preliminary on-orbit performance of the Thermal Infrared Sensor (TIRS) on board Landsat 8

Matthew Montanaro, Zelalem Tesfaye, Allen Lunsford, Brian Wenny, Dennis Reuter, Brian Markham, Ramsey Smith, Kurtis Thome

Proc. SPIE. 8866, Earth Observing Systems XVIII

KEYWORDS: Infrared sensors, Landsat, Sensors, Calibration, Space telescopes, Black bodies, Signal detection, Quantum well infrared photodetectors, Earth observing sensors, Temperature metrology

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Proceedings Article | 15 October 2012 Paper

Instrumentation and first results of the reflected solar demonstration system for the Climate Absolute Radiance and Refractivity Observatory

J. McCorkel, K. Thome, J. Hair, B. McAndrew, D. Jennings, D. Rabin, A. Daw, A. Lunsford

Proc. SPIE. 8510, Earth Observing Systems XVII

KEYWORDS: Sensors, Calibration, Spectroscopy, Remote sensing, Silicon, Reflectivity, Climate change, Radiometry, Climatology, Environmental sensing

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Proceedings Article | 20 May 2011 Paper

Spectral analysis of the primary flight focal plane arrays for the thermal infrared sensor

Matthew Montanaro, Dennis Reuter, Brian Markham, Kurtis Thome, Allen Lunsford, Murzy Jhabvala, Scott Rohrbach, Aaron Gerace

Proc. SPIE. 8048, Algorithms and Technologies for Multispectral, Hyperspectral, and Ultraspectral Imagery XVII

KEYWORDS: Infrared sensors, Optical filters, Landsat, Sensors, Calibration, Digital imaging, Black bodies, Atmospheric sensing, Quantum well infrared photodetectors, Earth observing sensors

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Proceedings Article | 20 May 2011 Paper

The Operational Land Imager (OLI) and the Thermal Infrared Sensor (TIRS) on the Landsat Data Continuity Mission (LDCM)

Dennis Reuter, James Irons, Allen Lunsford, Matthew Montanaro, Fernando Pellerano, Cathleen Richardson, Ramsey Smith, Zelalem Tesfaye, Kurtis Thome

Proc. SPIE. 8048, Algorithms and Technologies for Multispectral, Hyperspectral, and Ultraspectral Imagery XVII

KEYWORDS: Staring arrays, Infrared sensors, Observatories, Landsat, Imaging systems, Sensors, Calibration, Spatial resolution, Space operations, Earth observing sensors

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Proceedings Article | 20 May 2011 Paper

Calibration plan for the Thermal Infrared Sensor on the Landsat Data Continuity Mission

K. Thome, A. Lunsford, M. Montanaro, D. Reuter, R. Smith, Z. Tesfaye, B. Wenny

Proc. SPIE. 8048, Algorithms and Technologies for Multispectral, Hyperspectral, and Ultraspectral Imagery XVII

KEYWORDS: Staring arrays, Mirrors, Electronics, Landsat, Sensors, Calibration, Black bodies, Monochromators, Stray light, Earth observing sensors

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Showing 5 of 10 publications

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