Mr. Daniel O. Link Profile

Daniel O. Link

Senior Research Scientist at Science Systems and Applications Inc

SPIE Involvement:

Author

Publications (39)

Proceedings Article | 19 October 2023 Poster + Paper

NOAA-21 VIIRS day-night band on-orbit calibration and performance in early mission

H. Chen, J. Sun, D. Link, C. Sun, K. Chiang, X. Xiong

Proceedings Volume 12729, 127291G (2023) https://doi.org/10.1117/12.2678663

KEYWORDS: Calibration, Contamination, Magnesium, Equipment, Space operations, Sun, Signal detection, Satellites, Displays, Diffusers

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SPIE Journal Paper | 3 August 2023

Aqua MODIS: 20 years of on-orbit calibration and performance

Xiaoxiong Xiong, Amit Angal, Tiejun Chang, Emily Aldoretta, Xu Geng, Daniel Link, Junqiang Sun, Kevin Twedt, Aisheng Wu

JARS, Vol. 17, Issue 03, 037501, (August 2023) https://doi.org/10.1117/12.10.1117/1.JRS.17.037501

KEYWORDS: MODIS, Calibration, Crosstalk, Space operations, Equipment, Long wavelength infrared, Signal to noise ratio, Reflectivity, Mirrors, Sensors

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Proceedings Article | 28 October 2022 Presentation

Twenty years of Aqua MODIS on-orbit calibration, performance, and improvements

Xiaoxiong Xiong, Amit Angal, Tiejun Chang, Emily Aldoretta, Xu Geng, Daniel Link, Junqiang Sun, Kevin Twedt, Aisheng Wu

Proceedings Volume PC12264, PC122640B (2022) https://doi.org/10.1117/12.2635957

KEYWORDS: Calibration, MODIS, Sensors, Sensor calibration, Visible radiation, Remote sensing, Reflectivity, Long wavelength infrared, Infrared radiation, Environmental sensing

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Proceedings Article | 3 October 2022 Presentation

Uncertainty analysis for SNPP and NOAA-20 VIIRS day-night band

Junqiang Sun, Hongda Chen, Gal Sarid, Chengbo Sun, Daniel Link, Xiaoxiong Xiong

Proceedings Volume 12232, 122320O (2022) https://doi.org/10.1117/12.2632306

KEYWORDS: Uncertainty analysis, Sensors, Calibration, Reflectivity, Mirrors, Magnesium, Diffusers, Americium

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Proceedings Article | 30 September 2022 Presentation + Paper

The MODIS reflective solar band short-term stability assessment using the Spectro-Radiometric Calibration Assembly

Emily Aldoretta, Daniel Link, Xiaoxiong Xiong

Proceedings Volume 12232, 122320F (2022) https://doi.org/10.1117/12.2632457

KEYWORDS: Calibration, MODIS, Signal to noise ratio, Reflectivity, Sensors

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Proceedings Article | 30 September 2022 Presentation + Paper

Assessment of the pre-launch JPSS-4 VIIRS near-field response in an ambient environment

Daniel Link, Thomas Schwarting, Amit Angal, Xiaoxiong Xiong

Proceedings Volume 12232, 1223203 (2022) https://doi.org/10.1117/12.2632485

KEYWORDS: Sensors, Near field, Spatial resolution, Sensor performance

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Proceedings Article | 30 September 2022 Poster + Paper

Pre-launch characterization of VIIRS straylight

Qiang Ji, Jeffrey McIntire, Daniel Link, Xiaoxiong Xiong

Proceedings Volume 12232, 122321B (2022) https://doi.org/10.1117/12.2633181

KEYWORDS: Sensors, Satellites, Stray light

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Proceedings Article | 30 September 2022 Paper

Mitigation of sample dependent non-linearity in JPSS VIIRS day-night band radiometric calibration

Thomas Schwarting, Daniel Link, Chengbo Sun, Jeffrey McIntire, Xiaoxiong Xiong

Proceedings Volume 12232, 1223204 (2022) https://doi.org/10.1117/12.2633751

KEYWORDS: Calibration, Sensors, Diffusers, Satellites

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Proceedings Article | 30 September 2022 Presentation + Paper

S-NPP and NOAA-20 VIIRS day-night band on-orbit calibration and performance

H. Chen, C. Sun, D. Link, G. Sarid, J. Sun, X. Xiong

Proceedings Volume 12232, 122320P (2022) https://doi.org/10.1117/12.2632310

KEYWORDS: Sensors, Calibration, Contamination, Signal to noise ratio, Satellites, Diffusers

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Proceedings Article | 1 August 2021 Presentation + Paper

JPSS-3 VIIRS day-night band pre-launch radiometric characterization

Thomas Schwarting, Daniel Link, Chengbo Sun, Jeffrey McIntire, Xiaoxiong Xiong

Proceedings Volume 11829, 118290M (2021) https://doi.org/10.1117/12.2595044

KEYWORDS: Calibration, Lamps, Sensors, Charge-coupled devices, Magnesium, Signal to noise ratio, Photodiodes, Free electron lasers, Silicon, Satellites

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SPIE Journal Paper | 27 October 2020 Open Access

Terra MODIS: 20 years of on-orbit calibration and Performance (Erratum)

Xiaoxiong Xiong, Emily Aldoretta, Amit Angal, Tiejun Chang, Xu Geng, Daniel Link, Vincent Salomonson, Kevin Twedt, Aisheng Wu

JARS, Vol. 14, Issue 04, 049902, (October 2020) https://doi.org/10.1117/12.10.1117/1.JRS.14.049902

KEYWORDS: MODIS, Calibration, Remote sensing

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Proceedings Article | 6 October 2020 Presentation + Paper

Eighteen years of Aqua MODIS on-orbit operation, calibration, and performance

X. Xiong, E. Aldoretta, A. Angal, T. Chang, X. Geng, D. Link, J. Sun, K. Twedt, A. Wu

Proceedings Volume 11530, 1153013 (2020) https://doi.org/10.1117/12.2574995

KEYWORDS: Calibration, MODIS, Sensors, Earth's atmosphere, Atmospheric sciences, Remote sensing system design, Reflectivity, Remote sensing, Environmental sensing, Climatology

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SPIE Journal Paper | 1 September 2020

NOAA-20 Visible Infrared Imaging Radiometer Suite day–night band on-orbit calibration and performance

Hongda Chen, Xiaoxiong Xiong, Daniel Link, Chengbo Sun, Kwofu Chiang

JARS, Vol. 14, Issue 03, 034516, (September 2020) https://doi.org/10.1117/12.10.1117/1.JRS.14.034516

KEYWORDS: Calibration, Sensors, Visible radiation, Radiometry, Infrared imaging, Magnesium, Signal to noise ratio, Contamination, Space operations, Sun

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Proceedings Article | 20 August 2020 Poster + Paper

The MODIS RSB calibration and look-up table delivery process for collections 6 and 6.1

Emily Aldoretta, Amit Angal, Kevin Twedt, Hongda Chen, Yonghong Li, Daniel Link, Qiaozhen Mu, Kevin Vermeesch, Xiaoxiong Xiong

Proceedings Volume 11501, 115011Q (2020) https://doi.org/10.1117/12.2570785

KEYWORDS: MODIS, Calibration, Sensors, Reflectivity, Mirrors

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Proceedings Article | 20 August 2020 Poster + Paper

Twenty years of Terra MODIS spatial performance using the spectro-radiometric calibration assembly

Daniel Link, Emily Aldoretta, Kevin Twedt, Xiaoxiong Xiong

Proceedings Volume 11501, 115011I (2020) https://doi.org/10.1117/12.2568047

KEYWORDS: Spatial analysis, Calibration, MODIS, Sensors, Lamps, Signal detection, Long wavelength infrared, Spectral calibration, Reticles

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Proceedings Article | 20 August 2020 Presentation + Paper

Measuring crosstalk in MODIS spectral bands on-orbit using the SRCA

Daniel Link, Emily Aldoretta, Truman Wilson, Xiaoxiong Xiong

Proceedings Volume 11501, 115010E (2020) https://doi.org/10.1117/12.2568084

KEYWORDS: MODIS, Sensors, Calibration, Contamination, Space operations, Lamps, Signal detection

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Proceedings Article | 20 August 2020 Presentation + Paper

Twenty years of Terra MODIS spectral performance using the spectro-radiometric calibration assembly

Emily Aldoretta, Daniel Link, Kevin Twedt, Xiaoxiong Xiong

Proceedings Volume 11501, 115010D (2020) https://doi.org/10.1117/12.2570782

KEYWORDS: MODIS, Lamps, Calibration, Spectral calibration, Sensors, Reflectivity, Near infrared, Monochromators

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SPIE Journal Paper | 8 August 2020

Terra MODIS: 20 years of on-orbit calibration and performance

Xiaoxiong Xiong, Emily Aldoretta, Amit Angal, Tiejun Chang, Xu Geng, Daniel Link, Vincent Salomonson, Kevin Twedt, Aisheng Wu

JARS, Vol. 14, Issue 03, 037501, (August 2020) https://doi.org/10.1117/12.10.1117/1.JRS.14.037501

KEYWORDS: Equipment, Crosstalk, Short wave infrared radiation, Calibration, MODIS, Sensors, Long wavelength infrared, Staring arrays, Signal to noise ratio, Algorithm development

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Since its launch in December 1999, Terra Moderate Resolution Imaging Spectroradiometer (MODIS) has successfully operated for more than 20 years, with its observations generating a broad range of science data products that have greatly enabled the remote sensing community and users worldwide in their studies of many key geophysical parameters of the Earth’s systems. MODIS collects data in 36 spectral bands, covering wavelengths from 0.41 to 14.4 μm, which are calibrated by a set of onboard calibrators (OBCs). Also contributing to the sensor’s mission-long on-orbit calibration and characterization are near-monthly scheduled lunar observations and multiple time series of the sensor’s responses over select ground targets at a variety of scan angles. To a large extent, the quality of MODIS data products relies strongly on the dedicated efforts to operate and calibrate the instrument, to derive and update calibration parameters, and to develop and implement new calibration strategies and algorithms in response to on-orbit changes of the sensor’s characteristics and its OBC functions. We provide an overview of the Terra MODIS on-orbit operation and calibration activities over the last 20 years, including changes made to extend and preserve the instrument and OBC functions and their operation strategies. It also illustrates the sensor’s on-orbit performance with results derived from its OBC, lunar observations, and select ground targets and discusses major changes in sensor characteristics and corrections applied to the L1B algorithms as well as calibration lookup table updates. To date, the Terra MODIS instrument and its OBCs continue to operate and function normally. Except for those identified prelaunch, most spectral bands and detectors continue to meet their specified calibration requirements. Also discussed in our paper are lessons learned from Terra MODIS operation and calibration, as well as future efforts to further extend and maintain the quality of its long-term data records.

Proceedings Article | 9 September 2019 Presentation + Paper

Terra MODIS: 20 years of on-orbit calibration and performance

Xiaoxiong Xiong, Emily Aldoretta, Amit Angal, Tiejun Chang, Xu Geng, Dan Link, Vincent Salomonson, Kevin Twedt, Aisheng Wu

Proceedings Volume 11127, 1112714 (2019) https://doi.org/10.1117/12.2531933

KEYWORDS: Calibration, MODIS, Sensors, Diffusers, Earth's atmosphere, Visible radiation, Long wavelength infrared, Infrared radiation, Reflectivity, Black bodies

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Proceedings Article | 11 October 2018 Paper

JPSS-2 VIIRS day-night band pre-launch characterization

Thomas Schwarting, Daniel Link, Chengbo Sun, Jeffrey McIntire, Hassan Oudrari, Xiaoxiong Xiong

Proceedings Volume 10785, 1078511 (2018) https://doi.org/10.1117/12.2326711

KEYWORDS: Calibration, Sensors, Charge-coupled devices, Magnesium, Lamps, Signal to noise ratio, Photodiodes, Logic, Particles, Reflectivity

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Proceedings Article | 7 September 2018 Presentation + Paper

Assessment of the on-orbit MODIS SRCA spectral uncertainty

Emily Aldoretta, Daniel Link, Kevin Twedt, Xiaoxiong Xiong

Proceedings Volume 10764, 1076412 (2018) https://doi.org/10.1117/12.2321149

KEYWORDS: MODIS, Calibration, Reflectivity, Diffraction gratings, Spectral calibration, Diffraction

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Proceedings Article | 11 October 2017 Paper

Assessment of MODIS reflective solar bands calibration stability

X. Xiong, A. Angal, D. Link, A. Wu

Proceedings Volume 10423, 1042318 (2017) https://doi.org/10.1117/12.2277988

KEYWORDS: Calibration, MODIS, Reflectivity, Sensors, Bidirectional reflectance transmission function, Lamps, Diffusers, Domes, Signal to noise ratio, Polarization

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Proceedings Article | 5 September 2017 Presentation + Paper

Assessment of S-NPP VIIRS band-to-band registration using Earth-scene features

Daniel Link, Zhipeng Wang, Xiaoxiong Xiong

Proceedings Volume 10402, 1040221 (2017) https://doi.org/10.1117/12.2273057

KEYWORDS: Image registration, Image resolution, Spatial resolution, Calibration, Visible radiation, Infrared imaging, Radiometry, Space operations, Spectral resolution, Staring arrays

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Proceedings Article | 5 September 2017 Paper

Status of the MODIS spatial and spectral characterization and performance after recent SRCA operational changes

Daniel Link, Zhipeng Wang, Kevin Twedt, Xiaoxiong Xiong

Proceedings Volume 10402, 104022G (2017) https://doi.org/10.1117/12.2273053

KEYWORDS: MODIS, Lamps, Calibration, Space operations, Sensors, Spectral calibration, Sensor performance, Satellites

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Proceedings Article | 14 December 2016 Paper

Sixteen years of Terra MODIS on-orbit operation, calibration, and performance

X. Xiong, A. Angal, A. Wu, D. Link, X. Geng, W. Barnes, V. Salomonson

Proceedings Volume 10000, 100000V (2016) https://doi.org/10.1117/12.2241352

KEYWORDS: Calibration, MODIS, Sensors, Long wavelength infrared, Diffusers, Space operations, Electronics, Staring arrays, Signal to noise ratio, Photovoltaics

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Proceedings Article | 19 September 2016 Paper

Calibration improvements in the detector-to-detector differences for the MODIS ocean color bands

Yonghong Li, Amit Angal, Aisheng Wu, Xu Geng, Daniel Link, Xiaoxiong Xiong

Proceedings Volume 9972, 99721V (2016) https://doi.org/10.1117/12.2236920

KEYWORDS: MODIS, Sensors, Calibration, Diffusers, Satellites, Reflectivity, Visible radiation, Near infrared, Detection and tracking algorithms, Mirrors

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Proceedings Article | 19 September 2016 Presentation + Paper

Assessment of MODIS on-orbit calibration using a deep convective cloud technique

Qiaozhen Mu, Aisheng Wu, Tiejun Chang, Amit Angal, Daniel Link, Xiaoxiong Xiong, David Doelling, Rajendra Bhatt

Proceedings Volume 9972, 997210 (2016) https://doi.org/10.1117/12.2237047

KEYWORDS: MODIS, Calibration, Clouds, Sensors, Diffusers, Reflectivity, Short wave infrared radiation, Mirrors, Absorption, Infrared radiation

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Proceedings Article | 19 September 2016 Paper

Improvement in the characterization of MODIS subframe difference

Yonghong Li, Amit Angal, Na Chen, Xu Geng, Daniel Link, Zhipeng Wang, Aisheng Wu, Xiaoxiong Xiong

Proceedings Volume 9972, 99720W (2016) https://doi.org/10.1117/12.2238636

KEYWORDS: MODIS, Calibration, Satellites, Spatial resolution, Spectral calibration, Sensors, Mirrors, Data analysis, Reflectivity, Near infrared

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Proceedings Article | 17 May 2016 Paper

Tracking the on-orbit spatial performance of MODIS using ground targets

Daniel Link, Jake Brinkmann, Xiaoxiong Xiong, Zhipeng Wang

Proceedings Volume 9840, 984029 (2016) https://doi.org/10.1117/12.2223980

KEYWORDS: MODIS, Calibration, Sensors, Space operations, Image registration, Spectral calibration, Staring arrays, Reflectivity, Spatial resolution, Image resolution

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Proceedings Article | 2 May 2016 Paper

On-orbit performance and calibration improvements for the reflective solar bands of Terra and Aqua MODIS

Amit Angal, Xiaoxiong (Jack) Xiong, Aisheng Wu, Hongda Chen, Xu Geng, Daniel Link, Yonghong Li, Andrew Wald, Jake Brinkmann

Proceedings Volume 9881, 98811F (2016) https://doi.org/10.1117/12.2223912

KEYWORDS: MODIS, Calibration, Reflectivity, Diffusers, Sensors, Mirrors, Short wave infrared radiation, Signal to noise ratio, Neodymium, Detection and tracking algorithms

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Moderate Resolution Imaging Spectroradiometer (MODIS) is the keystone instrument for NASA’s EOS Terra and Aqua missions, designed to extend and improve heritage sensor measurements and data records of the land, oceans and atmosphere. The reflective solar bands (RSB) of MODIS covering wavelengths from 0.41 μm to 2.2 μm, are calibrated on-orbit using a solar diffuser (SD), with its on-orbit bi-directional reflectance factor (BRF) changes tracked using a solar diffuser stability monitor (SDSM). MODIS is a scanning radiometer using a two-sided paddle-wheel mirror to collect earth view (EV) data over a range of ±55° off instrument nadir. In addition to the solar calibration provided by the SD and SDSM system, lunar observations at nearly constant phase angles are regularly scheduled to monitor the RSB calibration stability. For both Terra and Aqua MODIS, the SD and lunar observations are used together to track the on-orbit changes of RSB response versus scan angle (RVS) as the SD and SV port are viewed at different angles of incidence (AOI) on the scan mirror. The MODIS Level 1B (L1B) Collection 6 (C6) algorithm incorporated several enhancements over its predecessor Collection 5 (C5) algorithm. A notable improvement was the use of the earth-view (EV) response trends from pseudo-invariant desert targets to characterize the on-orbit RVS for select RSB (Terra bands 1-4, 8, 9 and Aqua bands 8, 9) and the time, AOI, and wavelength-dependent uncertainty. The MODIS Characterization Support Team (MCST) has been maintaining and enhancing the C6 algorithm since its first update in November, 2011 for Aqua MODIS, and February, 2012 for Terra MODIS. Several calibration improvements have been incorporated that include extending the EV-based RVS approach to other RSB, additional correction for SD degradation at SWIR wavelengths, and alternative approaches for on-orbit RVS characterization. In addition to the on-orbit performance of the MODIS RSB, this paper also discusses in detail the recent calibration improvements implemented in the MODIS L1B C6.

Proceedings Article | 2 May 2016 Paper

Status of MODIS spatial and spectral characterization and performance

Dan Link, Zhipeng Wang, Xiaoxiong Xiong

Proceedings Volume 9881, 98811G (2016) https://doi.org/10.1117/12.2224307

KEYWORDS: Diffusers, MODIS, Calibration, Sensors, Lamps, Spectral calibration, Modulation transfer functions, Mirrors, Reflectivity

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Proceedings Article | 12 October 2015 Paper

Cross-calibration of the reflective solar bands of Terra MODIS and Landsat 7 Enhanced Thematic Mapper plus over PICS using different approaches

Amit Angal, Jake Brinkmann, Nischal Mishra, Daniel Link, Xiaoxiong Xiong, Dennis Helder

Proceedings Volume 9639, 963911 (2015) https://doi.org/10.1117/12.2195170

KEYWORDS: Earth observing sensors, MODIS, Calibration, Reflectivity, Sensors, Bidirectional reflectance transmission function, Photonic integrated circuits, Landsat, Neodymium, Short wave infrared radiation

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Proceedings Article | 12 October 2015 Paper

Assessment of MODIS on-orbit spatial performance

Daniel Link, Xiaoxiong Xiong, Zhipeng Wang

Proceedings Volume 9639, 963910 (2015) https://doi.org/10.1117/12.2194114

KEYWORDS: MODIS, Calibration, Sensors, Lamps, Staring arrays, Modulation transfer functions, Spatial resolution, Reticles, Satellites, Spectral calibration

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Proceedings Article | 19 November 2014 Paper

On-orbit performance of the MODIS SWIR bands

Amit Angal, Aisheng Wu, Xiaoxiong Xiong, Xu Geng, Daniel Link, Hongda Chen

Proceedings Volume 9264, 92641Q (2014) https://doi.org/10.1117/12.2069308

KEYWORDS: MODIS, Short wave infrared radiation, Reflectivity, Calibration, Sensors, Diffusers, Mid-IR, Neodymium, Mirrors, Near infrared

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Proceedings Article | 2 October 2014 Paper

Status of Terra MODIS operation, calibration, and performance

Xiaoxiong Xiong, Brian Wenny, Aisheng Wu, Amit Angal, Xu Geng, Hongda Chen, Jennifer Dodd, Daniel Link, Sriharsha Madhavan, Na Chen, Yonghong Li, Sean Iacangelo, William Barnes, Vince Salomonson

Proceedings Volume 9218, 92180O (2014) https://doi.org/10.1117/12.2062645

KEYWORDS: MODIS, Calibration, Sensors, Long wavelength infrared, Space operations, Mirrors, Diffusers, Electronics, Signal to noise ratio, Near infrared

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Proceedings Article | 25 September 2014 Paper

Status of time-dependent response versus scan-angle (RVS) for Terra and Aqua MODIS reflective solar bands

Xu Geng, Amit Angal, Junqiang Sun, Hongda Chen, Aisheng Wu, Yonghong Li, Daniel Link, Xiaoxiong Xiong

Proceedings Volume 9218, 92181P (2014) https://doi.org/10.1117/12.2061098

KEYWORDS: MODIS, Calibration, Reflectivity, Algorithm development, Mirrors, Sensors, Detection and tracking algorithms, Diffusers, Visible radiation, Near infrared

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Proceedings Article | 16 October 2013 Paper

Status of MODIS on-orbit calibration and characterization

X. Xiong, B. Wenny, J. Sun, A. Angal, A. Wu, H. Chen, X. Geng, T. Choi, S. Madhavan, D. Link, W. Barnes, Vincent Salomonson

Proceedings Volume 8889, 88890U (2013) https://doi.org/10.1117/12.2028953

KEYWORDS: MODIS, Calibration, Sensors, Staring arrays, Long wavelength infrared, Mirrors, Space operations, Sensor calibration, Near infrared, Neodymium

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Proceedings Article | 3 June 2013 Paper

Terra and Aqua MODIS on-orbit spectral characterization for reflective solar bands

Taeyoung (Jason) Choi, Xiaoxiong (Jack) Xiong, Zhipeng Wang, Daniel Link

Proceedings Volume 8724, 87240Y (2013) https://doi.org/10.1117/12.2016640

KEYWORDS: MODIS, Calibration, Short wave infrared radiation, Lamps, Spectral calibration, Sensors, Reflectivity, Diffraction gratings, Diffraction

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Proceedings Article | 19 November 2012 Paper

Overview of Aqua MODIS 10-year on-orbit calibration and performance

X. Xiong, B. Wenny, J. Sun, A. Angal, A. Wu, H. Chen, T. Choi, S. Madhavan, X. Geng, D. Link, Z. Wang, G. Toller, W. Barnes, V. Salomonson

Proceedings Volume 8533, 853316 (2012) https://doi.org/10.1117/12.973769

KEYWORDS: Calibration, MODIS, Sensors, Long wavelength infrared, Staring arrays, Near infrared, Sensor calibration, Reflectivity, Diffusers, Spectral calibration

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Showing 5 of 39 publications

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