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  • 1
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    Pre-Launch Radiometric Characterization of JPSS-1 VIIRS Thermal Emissive Bands (2016)
    In:  CASI
    Details
    Publication Date: 2019-05-21
    Description: Pre-launch characterization and calibration of the thermal emissive spectral bands on the Joint Polar Satellite System (JPSS-1) Visible Infrared Imaging Radiometer Suite (VIIRS) is critical to ensure high quality data products for environmental and climate data records post-launch. A comprehensive test program was conducted at the Raytheon El Segundo facility in 2013-2014, including extensive environmental testing. This work is focused on the thermal band radiometric performance and stability, including evaluation of a number of sensor performance metrics and estimation of uncertainties. Analysis has shown that JPSS-1 VIIRS thermal bands perform very well in relation to their design specifications, and comparisons to the Suomi National Polar-orbiting Partnership (SNPP) VIIRS instrument have shown their performance to be comparable.
    Keywords: Earth Resources and Remote Sensing
    Type: GSFC-E-DAA-TN29811 , Remote Sensing (ISSN 2072-4292); 8; 1; 47
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  • 2
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    MODIS Solar Calibration Simulation Assisted Refinement (2004)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: A detailed optical radiometric model has been created of the MODIS instruments solar calibration process. This model takes into account the orientation and distance of the spacecraft with respect to the sun, the correlated motions of the scan mirror and the sun, all of the optical elements, the detector locations on the visible and near IR focal planes, the solar diffuser and the attenuation screen with all of its hundreds of pinholes. An efficient computational scheme, takes into account all of these factors and has produced results which reproduce the observed time dependent intensity variations on the two focal planes with considerable fidelity. This agreement between predictions and observations, has given insight to the causes of some small time dependent variations and how to incorporate them into the overall calibration scheme. The radiometric model is described and modeled and actual measurements are presented and compared.
    Keywords: Earth Resources and Remote Sensing
    Type: SPIE Conference; Nov 08, 2004 - Nov 12, 2004; Honolulu, HI; United States
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  • 3
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    Polarization Ray Trace Model of the MODIS Instrument (2004)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: Sunlight reflected from the earth is, to a certain extent, polarized. Radiometers, such as the MODIS instrument on board the TERRA and AQUA spacecraft, are to a certain extent polarizers. Accurate radiometric measurements must take into account both the polarization state of the scene and the polarization sensitivity of the measuring instrument. The measured polarization characteristics of the MODIS instruments are contained in various radiometric models. Continued use of these radiometric math models, over a number of years, have shown where these models can be improved. Currently a MODIS polarization ray trace model has been created which models the thin film structure on the optical elements. This approach is described and modeled and measured instrument polarization sensitivity results presented.
    Keywords: Earth Resources and Remote Sensing
    Type: 2004 Conference on Characterization and Radiometry Calibration for Remote Sensing; Aug 01, 2004; UT; United States
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  • 4
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    Polarization Modeling of the MODIS Instrument (2004)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: Sunlight reflected from the earth is, to a certain extent, polarized. Radiometers, such as the MODIS instrument on board the TERRA and AQUA spacecraft, are to a certain extent polarizers. Accurate radiometric measurements must take into account both the polarization state of the scene and the polarization sensitivity of the measuring instrument. The measured polarization characteristics of the MODIS instruments are contained in various radiometric models. Continued use of these radiometric math models, over a number of years, have shown where these models can be improved. The current MODIS polarization modeling effort is discussed in the context and limitations of past modeling efforts.
    Keywords: Earth Resources and Remote Sensing
    Type: SPIE-Optical Science and Technology Annual Meeting; Aug 02, 2004 - Aug 06, 2004; Denver, CO; United States
    Format: text
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  • 5
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    JPSS-2 VIIRS Polarization Sensitivity Performance Comparison with Heritage VIIRS Sensors (2018)
    In:  CASI
    Details
    Publication Date: 2019-07-20
    Description: The Joint Polar Satellite System 2 (JPSS-2) is the follow-on for the Suomi-National Polar-orbiting Partnership (S-NPP) and Joint Polar Satellite System 1 (JPSS-1) missions. These spacecrafts provide critical weather and global climate products to the user community. A primary sensor on both JPSS and S-NPP is the Visible-Infrared Imaging Radiometer Suite (VIIRS) with Earth observations covering the Reflective Solar Band (RSB), Thermal Emissive Band (TEB) and Day Night Band (DNB) spectral regions. The VIIRS Sensor Data Records (SDRs) contain the calibrated Earth observations that are used in Environmental Data Record (EDR) products such as Ocean Color/Chlorophyll (OCC) and Sea Surface Temperature (SST). This SDR calibration is performed using unpolarized sources such as the Solar Diffuser (SD) for the RSBs and an On-Board Calibrator BlackBody (OBCBB) for the TEBs. Therefore, polarized Earth scenes will have radiometric bias errors within the SDRs based on how sensitive VIIRS is to polarized illumination and is corrected in some EDR algorithms. This paper will discuss the JPSS-2 VIIRS polarization characterization methodology, polarization sensitivity results and compare its performance to its predecessors S-NPP and JPSS-1 VIIRS. Optical modifications to the JPSS-2 VIIRS sensor to address heritage polarization sensitivity issues will be discussed.
    Keywords: Earth Resources and Remote Sensing
    Type: GSFC-E-DAA-TN64677 , SPIE Asia-Pacific Remote Sensing 2018; Sep 24, 2018 - Sep 26, 2018; Honolulu, HI; United States
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  • 6
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    JPSS-1 VIIRS Version 2 At-Launch Relative Spectral Response Characterization and Performance (2017)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The relative spectral response (RSR) characterization of the JPSS-1 VIIRS spectral bands has achieved at launch status in the VIIRS Data Analysis Working Group February 2016 Version 2 RSR release. The Version 2 release improves upon the June 2015 Version 1 release by including December 2014 NIST TSIRCUS spectral measurements of VIIRS VisNIR bands in the analysis plus correcting CO2 influence on the band M13 RSR. The T-SIRCUS based characterization is merged with the summer 2014 SpMA based characterization of VisNIR bands (Version 1 release) to yield a fused RSR for these bands, combining the strengths of the T-SIRCUS and the SpMA measurement systems. The M13 RSR is updated by applying a model-based correction to mitigate CO2 attenuation of the SpMA source signal that occurred during M13 spectral measurements. The Version 2 release carries forward the Version 1 RSR for those bands that were not updated (M8-M12, M14-M16AB, I3-I5, DNBMGS). The Version 2 release includes band average (overall detectors and subsamples) RSR plus supporting RSR for each detector and subsample. The at-launch band average RSR have been used to populate Look-Up Tables supporting the sensor data record and environmental data record at-launch science products. Spectral performance metrics show that JPSS-1VIIRS RSR are compliant on specifications with a few minor exceptions. The Version 2 release, which replaces the Version 1 release, is currently available on the password-protected NASA JPSS-1 eRooms under EAR99 control.
    Keywords: Earth Resources and Remote Sensing
    Type: GSFC-E-DAA-TN44311 , Earth Observing Systems XXI Conference; Aug 28, 2016; San Diego, CA; United States|SPIE Proceedings (ISSN 0277-786X) (e-ISSN 1996-756X); 9972; 997203
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