Ms. Na Chen Profile

Na Chen

at Science Systems and Applications Inc

SPIE Involvement:

Author

Publications (22)

Proceedings Article | 12 September 2021 Presentation + Paper

MODIS thermal emissive bands calibration improvements for Collection 7

Tiejun Chang, Ashish Shrestha, Carlos Perez Diaz, Na Chen, Aisheng Wu, Truman Wilson, Yonghong Li, Xiaoxiong Xiong

Proceedings Volume 11858, 118580R (2021) https://doi.org/10.1117/12.2597523

KEYWORDS: MODIS, Calibration, Sensors, Contamination, Image quality

Read Abstract +

Proceedings Article | 1 August 2021 Poster + Paper

Impact of mirror-side correlated noise on radiometric calibration of MODIS thermal emissive bands

Aisheng Wu, Na Chen, Ashish Shrestha, Xiaoxiong Xiong

Proceedings Volume 11829, 118291A (2021) https://doi.org/10.1117/12.2594210

KEYWORDS: Mirrors, Calibration, MODIS, Sensors, Switches, Mid-IR, Diffusers, Temperature metrology, Spectral calibration, Space operations

Read Abstract +

Proceedings Article | 12 April 2021 Presentation + Paper

Status of the moderate-resolution imaging spectroradiometer level 1B algorithm

Kevin Vermeesch, Xu Geng, Na Chen

Proceedings Volume 11727, 117270H (2021) https://doi.org/10.1117/12.2586008

KEYWORDS: MODIS, Calibration, Reflectivity, Space operations, Sensors, Remote sensing, Ranging, Earth's atmosphere

Read Abstract +

SPIE Journal Paper | 23 March 2021

On-orbit calibration and performance assessments of Terra and Aqua MODIS thermal emissive bands

Xiaoxiong Xiong, Aisheng Wu, Tiejun Chang, Truman Wilson, Yonghong Li, Na Chen, Ashish Shrestha, Carlos Pérez Díaz

JARS, Vol. 15, Issue 01, 014520, (March 2021) https://doi.org/10.1117/12.10.1117/1.JRS.15.014520

KEYWORDS: MODIS, Calibration, Sensors, Long wavelength infrared, Space operations, Photovoltaics, Mirrors, Contamination, Clouds, Temperature metrology

Read Abstract +

Terra and Aqua MODIS have successfully operated for more than 20 and 18 years, respectively, and far exceeded their designed lifetimes of 6 years. MODIS has 36 spectral bands, among which 16 are the thermal emissive bands (TEB) covering a wavelength range from 3.75 to 14.24 μm. Observations from the MODIS TEB have been used to generate a number of data products, such as surface/cloud/atmospheric temperatures, cloud top altitude, and water vapor properties. To a large extent, the quality of the MODIS L1B radiance product has been maintained through the entirety of each mission via extensive on-orbit calibration and validation efforts. MODIS TEB calibration uses a quadratic algorithm and is referenced to an on-board blackbody with its temperature measurements traceable to the NIST standard. We provide an overview of the MODIS instrument operations, key TEB calibration activities, and algorithms used in the latest L1B data Collection 6.1 (C6.1) and describe the TEB on-orbit performance for both Terra and Aqua MODIS. The TEB gain trends have been stable to within 5% over the Terra mission after 2003 under the same electronic configuration, except for bands 27 to 30, and within 3% over the Aqua mission. The Terra MODIS optical crosstalk correction implemented right after launch has been very effective in removing the ghost images in its photoconductive detector bands 32 to 36. Starting from C6.1, an electronic crosstalk correction algorithm has also been applied to the Terra MODIS photovoltaic detector long-wave infrared bands 27 to 30. The noise characterization performance remains stable with most TEB detectors continuously meeting their design requirements. A gradual loss of the Aqua MODIS radiative cooler margin reached its maximum in 2013 and has been slowly recovering since then. On-orbit changes in TEB response versus scan angle are extremely small based on pitch maneuver observations and assessments using vicarious approaches. The remaining challenges in TEB calibration and proposed improvements for the upcoming data collection with L1B data production and reprocessing are discussed.

Proceedings Article | 20 August 2020 Poster + Paper

MODIS TEB calibration algorithm improvements for future L1B collection

Tiejun Chang, Ashish Shrestha, Carlos Perez Diaz, Yonghong Li, Na Chen, Aisheng Wu, Xiaoxiong Xiong

Proceedings Volume 11501, 115011H (2020) https://doi.org/10.1117/12.2567226

KEYWORDS: Calibration, MODIS, Sensors, Mid-IR

Read Abstract +

Proceedings Article | 20 August 2020 Poster + Paper

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

Ashish Shrestha, Tiejun Chang, Aisheng Wu, Yonghong Li, Carlos Perez Diaz, Na Chen, Xiaoxiong Xiong

Proceedings Volume 11501, 115011R (2020) https://doi.org/10.1117/12.2570823

KEYWORDS: MODIS, Calibration, Sensors, Long wavelength infrared, Algorithm development

Read Abstract +

Proceedings Article | 23 October 2018 Paper

Prelaunch and on-orbit electronic calibration for Earth-observing instruments

Amit Angal, Xiaoxiong Xiong, Jeff McIntire, Na Chen, Hassan Oudrari

Proceedings Volume 10781, 107811D (2018) https://doi.org/10.1117/12.2500057

KEYWORDS: MODIS, Sensors, Calibration, Photovoltaics, Long wavelength infrared, Signal processing, Analog electronics, Staring arrays, Earth observing sensors, Signal detection

Read Abstract +

Proceedings Article | 25 September 2018 Presentation + Paper

Assessment of Terra MODIS thermal emissive band calibration using cold targets and measurements in lunar roll events

Tiejun Chang, Xiaoxiong Xiong, Ashish Shrestha, Aisheng Wu, Na Chen, Yonghong Li, Qiaozhen Mu

Proceedings Volume 10785, 107851C (2018) https://doi.org/10.1117/12.2325378

KEYWORDS: Calibration, Mirrors, MODIS, Long wavelength infrared, Sensors

Read Abstract +

Terra MODIS has provided continuous global observations for science research and applications for more than 18 years. The MODIS Thermal emissive bands (TEB) radiometric calibration uses a quadratic function for instrument response. The calibration coefficients are updated using the response of an on-board blackbody (BB) in quarterly warm-up and cool-down (WUCD) events. As instrument degradation and electronic crosstalk of long-wave infrared (LWIR) bands 27 to 30 developed substantial issues, accurate calibration is crucial for a high-quality L1B product. The on-board BB WUCD temperature ranges from 270 K to 315 K and the derived nonlinear response has a relatively large uncertainty for the offset, especially for these LWIR bands, which affects the measurements of low brightness temperature (BT) scenes. In this study, the TEB radiometric calibration impact on the L1B product is assessed using selected cold targets and the measurements during regular lunar rolls. The cold targets include Antarctic Dome Concordia (Dome-C) and deep convective clouds (DCC) for the calibration assessment, focusing on bands 27 to 30. Dome-C area is covered with uniformly-distributed permanent snow, and the atmospheric effect is small and relatively constant. Usually the DCC is treated as an invariant earth target to evaluate the reflective solar band calibration. The DCC can also be treated as a stable target to assess the performance of TEB calibration. During a scheduled lunar observation event with a spacecraft roll maneuver to view the moon through the space view port, the instrument cavity provides a stable reference for calibration assessment. The long-term trending of BT measurements and the relative difference between scan mirror sides and detectors are used for the assessment of the calibration consistency and stability. The comparison of L1B products over the selected targets before and after the calibration coefficients update can be used to assess the impact of a calibration look-up table (LUT) update. This assessment is beneficial for future calibration algorithm and LUT update procedure improvements for enhancing the L1B product quality.

Proceedings Article | 29 September 2017 Paper

Cross comparison of the Collection 6 and Collection 6.1 Terra and Aqua MODIS Bands 1 and 2 using AVHRR N15 and N19

Xuexia Chen, Aisheng Wu, Xiaoxiong Xiong, Na Chen

Proceedings Volume 10423, 104231X (2017) https://doi.org/10.1117/12.2277857

KEYWORDS: MODIS, Calibration, Sensors, Reflectivity, Satellites, Remote sensing, Imaging systems, Radiometry, Earth sciences, Satellite imaging

Read Abstract +

Proceedings Article | 19 September 2016 Paper

Assessments and applications of Terra and Aqua MODIS on-orbit electronic calibration

Xiaoxiong Xiong, Na Chen, Yonghong Li, Truman Wilson

Proceedings Volume 9972, 99720X (2016) https://doi.org/10.1117/12.2238603

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

Read Abstract +

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

Read Abstract +

Proceedings Article | 2 May 2016 Paper

MODIS on-orbit thermal emissive bands lifetime performance

Sriharsha Madhavan, Aisheng Wu, Na Chen, Xiaoxiong Xiong

Proceedings Volume 9881, 98811X (2016) https://doi.org/10.1117/12.2222310

KEYWORDS: MODIS, Calibration, Sensors, Black bodies, Temperature metrology, Sensor calibration, Imaging systems, Space operations, Thermography, Infrared radiation, Long wavelength infrared, Electronics

Read Abstract +

Proceedings Article | 8 September 2015 Paper

Implementation of electronic crosstalk correction for terra MODIS PV LWIR bands

Xu Geng, Sriharsha Madhavan, Na Chen, Xiaoxiong Xiong

Proceedings Volume 9607, 960725 (2015) https://doi.org/10.1117/12.2185961

KEYWORDS: Sensors, MODIS, Calibration, Long wavelength infrared, Photovoltaics, Infrared radiation, Image processing, Mirrors, Diffusers, Electronic components

Read Abstract +

Proceedings Article | 2 December 2014 Paper

Adjusting Aqua MODIS TEB nonlinear calibration coefficients using iterative solution

Aisheng Wu, Zhipeng Wang, Yonghong Li, Sriharsha Madhavan, Brian Wenny, Na Chen, Xiaoxiong Xiong

Proceedings Volume 9264, 92640R (2014) https://doi.org/10.1117/12.2069246

KEYWORDS: MODIS, Calibration, Sensors, Satellites, Temperature metrology, Black bodies, Infrared radiation, Domes, Curium, Mirrors

Read Abstract +

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

Read Abstract +

Proceedings Article | 19 November 2012 Paper

MODIS TEB calibration approach in collection 6

Brian Wenny, Aisheng Wu, Sriharsha Madhavan, Zhipeng Wang, Yonghong Li, Na Chen, Kwo-Fu Chiang, Xiaoxiong Xiong

Proceedings Volume 8533, 85331M (2012) https://doi.org/10.1117/12.974231

KEYWORDS: Calibration, MODIS, Sensors, Algorithm development, Staring arrays, Mirrors, Long wavelength infrared, Black bodies, Detection and tracking algorithms, Temperature metrology

Read Abstract +

Proceedings Article | 28 August 2010 Paper

MODIS calibration algorithm improvements developed for Collection 6 Level-1B

Brian Wenny, Junqiang Sun, Xiaoxiong Xiong, Aisheng Wu, Hongda Chen, Amit Angal, Taeyoung Choi, Na Chen, Sriharsha Madhavan, Xu Geng, James Kuyper, Liqin Tan

Proceedings Volume 7807, 78071F (2010) https://doi.org/10.1117/12.860892

KEYWORDS: MODIS, Sensors, Calibration, Algorithm development, Mirrors, Detection and tracking algorithms, Space operations, Temperature metrology, Data processing, Reflectivity

Read Abstract +

Proceedings Article | 27 September 2007 Paper

Improvement of low temperature estimation for MODIS thermal emissive bands by adjusting calibration offset and nonlinear terms

A. Wu, X. Xiong, B. Wenny, C. Moeller, N. Chen, K. Chiang

Proceedings Volume 6677, 66771H (2007) https://doi.org/10.1117/12.730478

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

Read Abstract +

Proceedings Article | 7 September 2006 Paper

Results and lessons from MODIS thermal emissive bands calibration: pre-launch to on-orbit

X. Xiong, K. Chiang, N. Chen, S. Xiong, W. Barnes, B. Guenther

Proceedings Volume 6296, 62960A (2006) https://doi.org/10.1117/12.680992

KEYWORDS: Calibration, MODIS, Sensors, Mirrors, Temperature metrology, Electronics, Space operations, Staring arrays, Long wavelength infrared, Black bodies

Read Abstract +

Proceedings Article | 22 August 2005 Paper

Performance of the Terra MODIS on-board blackbody

X. Xiong, N. Chen, S. Xiong, K. Chiang, W. Barnes

Proceedings Volume 5882, 58820U (2005) https://doi.org/10.1117/12.615431

KEYWORDS: MODIS, Sensors, Calibration, Black bodies, Electronics, Mirrors, Space operations, Reflectivity, Temperature metrology, Radiometry

Read Abstract +

Proceedings Article | 10 November 2003 Paper

Detector stability of the Terra MODIS thermal emissive bands

Xiaoxiong Xiong, Kwo-Fu Chiang, Na Chen, S. Xiong, Aisheng Wu, Farida Adimi, William Barnes

Proceedings Volume 5151, (2003) https://doi.org/10.1117/12.504827

KEYWORDS: Sensors, Calibration, MODIS, Black bodies, Long wavelength infrared, Near infrared, Mirrors, Electronics, Signal to noise ratio, Spatial resolution

Read Abstract +

Proceedings Article | 24 September 2002 Paper

Aqua MODIS thermal emissive bands calibration algorithm and preliminary results

Xiaoxiong Xiong, Vincent Chiang, Na Chen, William Barnes

Proceedings Volume 4814, (2002) https://doi.org/10.1117/12.451986

KEYWORDS: Sensors, MODIS, Calibration, Mirrors, Black bodies, Space operations, Imaging systems, Algorithm development, Space mirrors, Detection and tracking algorithms

Read Abstract +

Showing 5 of 22 publications

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Keywords/Phrases

Search In:

Publication Years