Ms. Emily J. Aldoretta Profile

Emily J. Aldoretta

Scientific Analyst at Science Systems and Applications Inc

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Author

Publications (18)

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 | 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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SPIE Journal Paper | 1 July 2022

Terra and Aqua MODIS collection 7 level 1B algorithm

Amit Angal, Xiaoxiong Xiong, Tiejun Chang, Kevin Twedt, Xu Geng, Aisheng Wu, Emily Aldoretta

JARS, Vol. 16, Issue 03, 037502, (July 2022) https://doi.org/10.1117/12.10.1117/1.JRS.16.037502

KEYWORDS: MODIS, Calibration, Sensors, Reflectivity, Short wave infrared radiation, Long wavelength infrared, Detection and tracking algorithms, Polarization, Mirrors, Algorithm development

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Proceedings Article | 12 September 2021 Presentation + Paper

MODIS reflective solar bands calibration improvements for Collection 7

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

Proceedings Volume 11858, 118580S (2021) https://doi.org/10.1117/12.2597551

KEYWORDS: Calibration, Reflectivity, MODIS, Sensors, Short wave infrared radiation, Mirrors, Polarization, Image quality, Remote sensing

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Proceedings Article | 1 August 2021 Presentation + Paper

MODIS reflective solar band calibration improvements using pseudo-invariant desert targets

H. Chen, K. Twedt, K. Vermeesch, E. Aldoretta, A. Angal, X. Xiong

Proceedings Volume 11829, 118290Z (2021) https://doi.org/10.1117/12.2593364

KEYWORDS: Calibration, MODIS, Reflectivity, Sensors, Polarization, Satellites, Data processing, Bidirectional reflectance transmission function

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To provide the best science data quality, an accurate characterization of the response versus scan angle (RVS) function is critical for the MODIS reflective solar bands (RSB) on-orbit calibration. In every MODIS operational scan, the Earth’s surface, referred to here as Earth view (EV), the space view (SV) port, and the onboard calibrators are viewed via a twosided scan mirror. The RVS is defined as the sensor’s relative response as a function the angle of incidence (AOI) to the scan mirror. Many different approaches have been developed to derive the time-dependent RVS and its look-up table (LUT) applied to MODIS Level 1B (L1B) products since calibration Collection 4. For most MODIS RSB, the on-board calibrators can reasonably track the RVS change with time. In practice, their RVS is derived using data from on-board calibrators and the EV mirror side ratio (for mirror side 2). For Terra bands 1-4, 8-10 and Aqua bands 1-4, 8-9, an enhancement has been employed in Collections 6 and 6.1 (C6/C6.1) by using Earth scene response trending from pseudoinvariant desert sites in addition to the onboard calibrators. The current C6/C6/1 RVS algorithm is focused on fitting the EV data at each AOI over time and then deriving the relative change at different AOI. The EV response trending is currently fitted with multiple segments over time. Alternatively, the EV responses can be fit first as a function of AOI before fitting temporally in order to reduce the dependence on the stability of the desert site. These pre-treatment methods on the EV data provide improvement in the derived calibration coefficients. However, evidence of insufficient calibration is still observed in the MODIS L1B reflectance data, especially in the form of differences between the mirror sides. In this paper, we review the current methodologies that utilize the EV response trends from the pseudo-invariant Libyan desert targets to supplement the gain derived from the onboard calibrators. An improvement is then proposed and investigated such that a sliding window average (SWA) is used to pre-process the raw EV data. The SWA parameters are carefully selected using trade-off studies to accurately track the Earth scene response trending in multiple cases to overcome the reflectance differences between two mirror sides. Calibration results show improvements for both Aqua and Terra MODIS RSB L1B data products. This new adjustment has been included in the recently delivered Collection 7 LUT that will be evident in the L1B products expected to be released in late 2021.

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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Proceedings Article | 20 September 2020 Presentation + Paper

Analysis of the on-orbit response-versus-scan-angle for the MODIS SWIR bands derived from lunar observations

Truman Wilson, Emily Aldoretta, Amit Angal, Xu Geng, Kevin Twedt, Xiaoxiong Xiong

Proceedings Volume 11530, 115301E (2020) https://doi.org/10.1117/12.2572877

KEYWORDS: MODIS, Short wave infrared radiation, Calibration, Sensors, Contamination, Mirrors, Reflectivity, Photonic integrated circuits, Electronic components

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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 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 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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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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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 | 7 September 2018 Paper

On-orbit performance of the Terra and Aqua MODIS solar diffuser stability monitor

Emily Aldoretta, Kevin Twedt, Amit Angal, Hongda Chen, Xiaoxiong Xiong

Proceedings Volume 10764, 107641O (2018) https://doi.org/10.1117/12.2321163

KEYWORDS: Signal to noise ratio, Calibration, MODIS, Sensors, Diffusers, Reflectivity, Signal detection, Interference (communication), Space operations, Sun

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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 | 24 July 2014 Paper

MWC 314: binary results from optical interferometry compared with spectroscopy and photometry

Noel Richardson, Anthony F. J. Moffat, Raphael Maltais-Tariant, Herbert Pablo, Douglas Gies, Nicole St-Louis, Gail Schaefer, Anatoly Miroshnichenko, Chris Farrington, Emily Aldoretta, Etienne Artigau, Tabetha Boyajian, Katie Gordon, P. Goldfinger, Jeremy Jones, Rachel Matson, Harold McAlister, David O'Brien, Deepak Raghavan, Tahina Ramiaramanantsoa, Stephen Ridgway, Nic Scott, Judit Sturmann, Laszlo Sturmann, Theo ten Brummelaar, Joshua Thomas, Nils Turner, Norm Vargas, Sergey Zharikov

Proceedings Volume 9146, 91460G (2014) https://doi.org/10.1117/12.2055364

KEYWORDS: Stars, Spectroscopy, Interferometry, Photometry, Absorption, Telescopes, Calibration, Spectrophotometry, Binary data, Observatories

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Showing 5 of 18 publications

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