Dr. I-Wen Mike Chu Profile

Dr. I-Wen Mike Chu

Scientist at Ctr for Satellite Applications and Research

Publications (15)

Proceedings Article | 12 September 2019 Presentation

On aspects of on-orbit RSB calibration of SNPP VIIRS and other similar mulitspectral sensors. (Conference Presentation)

I-Wen Mike Chu, Junqiang Sun, Menghua Wang

Proceedings Volume 11127, 1112719 (2019) https://doi.org/10.1117/12.2529487

KEYWORDS: Calibration, Sensor calibration, Sensors, MODIS

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Proceedings Article | 9 September 2019 Presentation + Paper

Evaluating crosstalk-induced radiometric deviations in Terra MODIS Band 29, 31, and 32

Mike Chu

Proceedings Volume 11127, 111271E (2019) https://doi.org/10.1117/12.2529559

KEYWORDS: MODIS, Contamination, Modulation, Long wavelength infrared, Photovoltaics, Calibration, Sensors, Solids, Analytical research, Clouds

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Proceedings Article | 9 September 2019 Paper

The continual evaluation of NOAA-20 VIIRS RSB radiometric performance using intercomparison with Aqua MODIS

Mike Chu, Menghua Wang

Proceedings Volume 11127, 111272A (2019) https://doi.org/10.1117/12.2529480

KEYWORDS: MODIS, Calibration, Satellites, Sensors, Spatial resolution, Stars, Reflectivity, Diffusers, Satellite imaging, Bidirectional reflectance transmission function

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Proceedings Article | 9 September 2019 Presentation + Paper

On-orbit calibration performance of Sentinel-3A OLCI referencing to SNPP VIIRS: 2-year result

Mike Chu, Menghua Wang

Proceedings Volume 11127, 111270R (2019) https://doi.org/10.1117/12.2529469

KEYWORDS: Calibration, Satellites, Sensors, MODIS, Reflectivity, Modulation, Satellite imaging, Near infrared, Spatial resolution, Imaging systems

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Proceedings Article | 7 September 2018 Presentation + Paper

Evaluation of early NOAA-20 VIIRS RSB radiometric performance using intercomparison with Aqua MODIS

Mike Chu, Junqiang Sun, Menghua Wang

Proceedings Volume 10764, 107640W (2018) https://doi.org/10.1117/12.2321095

KEYWORDS: MODIS, Calibration, Satellites, Sensors, Satellite imaging, Bidirectional reflectance transmission function

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Proceedings Article | 7 September 2018 Paper

On-orbit RSB calibration of SNPP VIIRS using the full illumination profile of solar diffuser

Junqiang Sun, Mike Chu, Menghua Wang

Proceedings Volume 10764, 107641D (2018) https://doi.org/10.1117/12.2320828

KEYWORDS: Calibration, Sensors, Diffusers, Reflectivity, Sun, Satellites, Modulation, Solids, Light scattering, Space operations

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Proceedings Article | 5 September 2017 Presentation + Paper

The inter-sensor radiometric comparison of SNPP VIIRS reflective solar bands with Aqua MODIS updated through June 2017

Mike Chu, Junqiang Sun, Menghua Wang

Proceedings Volume 10402, 1040222 (2017) https://doi.org/10.1117/12.2272437

KEYWORDS: MODIS, Calibration, Statistical analysis, Satellites, Sensors, Sun

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Proceedings Article | 5 September 2017 Presentation + Paper

RSB calibration of SNPP VIIRS using solar diffuser illuminated by scattered light

Junqiang Sun, Mike Chu, Menghua Wang

Proceedings Volume 10402, 104021Y (2017) https://doi.org/10.1117/12.2272898

KEYWORDS: Calibration, Diffusers, Light scattering, Reflectivity, Satellites, Light, MODIS, Remote sensing, Data processing, Sensor calibration

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Proceedings Article | 5 September 2017 Paper

The curious case of the intersensor radiometric comparison of SNPP VIIRS M11 with Aqua MODIS B7

Mike Chu, Junqiang Sun, Menghua Wang

Proceedings Volume 10402, 104022E (2017) https://doi.org/10.1117/12.2272434

KEYWORDS: MODIS, Calibration, Satellites, Spatial resolution, Reflectivity, Sun, Sensors, Data centers, Satellite imaging, Solids

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Proceedings Article | 19 September 2016 Presentation + Paper

An exposition on the solar diffuser degradation non-uniformity effect for SNPP VIIRS and Terra/Aqua MODIS

Junqiang Sun, Mike Chu, Menghua Wang

Proceedings Volume 9972, 99721E (2016) https://doi.org/10.1117/12.2236991

KEYWORDS: Calibration, Diffusers, MODIS, Bidirectional reflectance transmission function, Reflectivity, Satellites, Sensors, Calibration, MODIS, Reflectivity, Satellites, Satellite imaging, Mirrors, Space operations

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Proceedings Article | 19 September 2016 Paper

Radiometric evaluation of the SNPP VIIRS reflective solar band sensor data records via inter-sensor comparison with Aqua MODIS

Mike Chu, Juniqiang Sun, Menghua Wang

Proceedings Volume 9972, 99721R (2016) https://doi.org/10.1117/12.2236942

KEYWORDS: Calibration, MODIS, Satellites, Reflectivity, Satellite imaging, Sensors, Statistical analysis, Sun, Spatial resolution, Data centers

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The Visible Infrared Imaging Radiometer Suite (VIIRS) in the Suomi National Polar-orbiting Partnership (SNPP) satellite has been on orbit for nearly five years since its launch on 28 October 2011. The NOAA Ocean Color (OC) Team through the investigations of Sun and Wang has recently achieved robust calibration of the VIIRS reflective solar bands (RSBs) and generated its own version of the sensor data records (SDRs) with accuracy sufficient for ocean color applications. For the purpose of making a direct evaluation of the SDR performance, for both the OC version and the official Interface Processing Data Segment (IDPS) version, we utilize an inter-sensor radiometric comparison of SNPP VIIRS against the MODerate-resolution Imaging Spectroradiometer (MODIS) onboard the Aqua satellite for the spectrally matching RSBs. The VIIRS RSBs M1–M8, from 410 to 1238 nm in the spectral range, are tested. Except for the VIIRS M1 versus MODIS Band 8 result, the radiance comparison time series shows that the OC SDRs demonstrate good agreement with Aqua MODIS and overall better results than the IDPS SDRs, such as less variation, no large discrepancy at the beginning of the VIIRS mission, and no long-term drift. The VIIRS M1 versus MODIS Band 8 trend is the lone exception showing a drift in the OC SDR-based trends, but eventually a downward drift of 1% in Aqua MODIS Band 8 is identified to be the cause. It is readily concluded that the inter-comparison result directly demonstrates the OC SDRs to be correct within statistics, especially considering that the ocean color products derived from the OC SDRs have already matured and demonstrated good agreement with in situ data. On the other hand, the IDPS SDR results demonstrably expose the known inherent growing bias in RSB calibration that affects any versions of the SNPP VIIRS SDRs not using the correctly mitigated calibration baseline. The inter-comparison of two moderate resolution sensors is also an exercise in statistics, and we briefly discuss key points of the pixel-based analysis that establishes the precision and the reliability of the result

Proceedings Article | 23 September 2013 Paper

On-orbit calibration performance of MODIS TDI bands

Mike Chu, Junqiang Sun, Amit Angal, Hongda Chen, Xu Geng, Taeyoung Choi, Xiaoxiang (Jack) Xiong

Proceedings Volume 8866, 886605 (2013) https://doi.org/10.1117/12.2024864

KEYWORDS: Calibration, MODIS, Sensors, Signal detection, Mirrors, Satellites, Environmental monitoring, Diffusers, Reflectivity, Imaging systems

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Proceedings Article | 23 September 2013 Paper

Assessment of the MODIS RSB detector differences using earth-view targets

Amit Angal, Junqiang Sun, Xu Geng, Mike Chu, Xiaoxiong Xiong

Proceedings Volume 8866, 88661T (2013) https://doi.org/10.1117/12.2023636

KEYWORDS: Sensors, MODIS, Calibration, Mirrors, Reflectivity, Space operations, Neodymium, Target detection, Diffusers, Sun

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Proceedings Article | 28 November 2012 Paper

MODIS reflective solar bands calibration improvements in Collection 6

Junqiang Sun, Amit Angal, Xiaoxiong Xiong, Hongda Chen, Xu Geng, Aisheng Wu, Taeyoung Choi, Mike Chu

Proceedings Volume 8528, 85280N (2012) https://doi.org/10.1117/12.979733

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

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Proceedings Article | 14 October 2010 Paper

Tracking long-term stability of the response versus angle for the MODIS thermal emissive bands with observations over clear ocean

Aisheng Wu, I-Wen Chu, Xiaoxiong Xiong

Proceedings Volume 7826, 78261Z (2010) https://doi.org/10.1117/12.864639

KEYWORDS: MODIS, Calibration, Mid-IR, Mirrors, Long wavelength infrared, Space operations, Infrared radiation, Sensors, Black bodies, Atmospheric sensing

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Showing 5 of 15 publications

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