VIIRS Calibration Events log
The Visible Infrared Imaging Radiometer Suite (VIIRS) is one of the key instruments onboard Suomi National Polar-Orbiting
Partnership (SNPP), NOAA-20, as well as future JPSS spacecraft. The VIIRS instrument provides moderate-resolution,
radiometrically accurate global images using 22 visible/near-infrared and infrared bands covering wavelengths from
0.41 to 12.5 microns. With NOAA-20 and SNPP spacecraft being operational and 50 minutes apart along the same sun-synchronous
orbit, the VIIRS instruments ensure a continuation of the Earth system observations. This page provides a summary of the
calibration activities and anomalies monitoring/resolution performed by NOAA/STAR VIIRS Cal/Val Team on the on-orbit
calibration/validation, data verification and long term monitoring of the VIIRS on both SNPP and NOAA-20.
| Event | StartDate | EndDate | Notes |
|---|---|---|---|
| VIIRS Lunar Calibration | 2/23/2021 | 2/23/2021 | No Roll centered at 3:58. Calculated lunar F-factors using GIRO model |
| VIIRS Lunar Calibration | 1/24/2021 | 1/24/2021 | Roll angle was -3.29 centered at 08:25 with sector rotation. Moonappreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 12/25/2020 | 12/25/2020 | Roll angle was -8.18 centered at 11:18 with sector rotation. Moonappreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 11/25/2020 | 11/25/2020 | Roll angle was -4.51 centered at 15:56 with sector rotation. Moonappreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 6/2/2020 | 6/2/2020 | No Roll centered at 00:45 with sector rotation. Moonappreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 5/3/2020 | 5/3/2020 | Roll angle was -1.87 centered at 18:34 with sector rotation. Moonappreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 4/4/2020 | 4/4/2020 | No Roll centered at 10:44 with sector rotation. Moonappreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 3/5/2020 | 3/5/2020 | No Roll centered at 21:49 with sector rotation. Moonappreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 2/5/2020 | 2/5/2020 | Roll angle was -1.57 centered at 09:04 with sector rotation. Moonappreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 1/6/2020 | 1/6/2020 | Roll angle was -6.45 centered at 15:18 with sector rotation. Moonappreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 12/7/2019 | 12/7/2019 | Roll angle was -6.315 centered at 19:55 with sector rotation. Moonappreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 11/7/2019 | 11/7/2019 | No sector roation perfomed. No lunar observation. |
| VIIRS Lunar Calibration | 6/13/2019 | 5/14/2019 | No Roll centered at 3:26 with sector rotation. Moonappreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 5/14/2019 | 5/14/2019 | Roll angle was -3.1 centered at 21:18 with sector rotation. Moonappreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 4/15/2019 | 4/15/2019 | No Roll centered at 16:48 with sector rotation. Moonappreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 3/17/2019 | 3/17/2019 | No Roll centered at 9:01 with sector rotation. Moonappreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 2/15/2019 | 2/15/2019 | Roll angle was -1.677 centered at 21:53 with sector rotation. Moonappreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 1/17/2019 | 1/17/2019 | Roll angle was -5.848 centered at 9:08 with sector rotation. Moonappreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 12/18/2018 | 12/18/2018 | Roll angle was -7.545 centered at 18:48 with sector rotation. Moonappreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 6/23/2018 | 6/23/2018 | No Roll centered at 12:52 with sector rotation. Moonappreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 5/25/2018 | 5/25/2018 | Roll angle was -2.13 centered at 5:03 with sector rotation. Moonappreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 4/25/2018 | 4/25/2018 | Roll angle was -3.06 centered at 19:30 with sector rotation. Moonappreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 2/26/2018 | 2/26/2018 | Roll angle was -1.13 centered at 5:37 with sector rotation. Moonappreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 1/27/2018 | 1/27/2018 | Roll angle was -4.223 centered at 20:13 with sector rotation. Moonappreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 12/29/2017 | 12/29/2017 | Roll angle was -7.6185 centered at 9:13 with sector rotation. Moonappreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 11/29/2017 | 11/29/2017 | Roll angle was -6.0426 centered at 20:34 with sector rotation. Moonappreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 10/31/2017 | 10/31/2017 | centered at 6:12 with sector rotation. Moonappreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 6/4/2017 | 6/4/2017 | Roll angle was -1.243 centered at 19:35 with sector rotation. Moonappreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 5/6/2017 | 5/6/2017 | Roll angle was -3.311 centered at 6:41 with sector rotation. Moonappreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 4/6/2017 | 4/6/2017 | Roll angle was -2.6382 centered at 19:28 with sector rotation. Moonappreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 3/8/2017 | 3/8/2017 | Roll angle was -1.8989 centered at 09:59 with sector rotation. Moonappreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 2/7/2017 | 2/7/2017 | Roll angle was -3.794 centered at 00:33 with sector rotation. Moonappreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 1/8/2017 | 1/8/2017 | Roll angle was -5.5713 centered at 18:35 with sector rotation. Moonappreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 12/10/2016 | 12/10/2016 | Roll angle was -7.6607 centered at 7:37 with sector rotation. Moonappreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 11/10/2016 | 11/10/2016 | Roll angle was -3.7351 centered at 20:39 with sector rotation. Moonappreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 6/15/2016 | 6/15/2016 | No roll centered at 18:36 with sector rotation. Moonappreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 5/17/2016 | 5/17/2016 | Roll angle was -2.6395 centered at 4:01 with sector rotation. Moonappreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 4/17/2016 | 4/17/2016 | Roll angle was -3.6343 centered at 11:43 with sector rotation. Moonappreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 3/18/2016 | 3/18/2016 | Roll angle was -2.8601 centered at 21:08 with sector rotation. Moonappreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 2/18/2016 | 2/18/2016 | Roll angle was -3.3312 centered at 8:18 with sector rotation. Moonappreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 1/19/2016 | 1/19/2016 | Roll angle was -5.3022 centered at 22:55 with sector rotation. Moonappreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 12/21/2015 | 12/21/2015 | Roll angle was -7.176 centered at 13:36 with sector rotation. Moonappreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 11/22/2015 | 11/22/2015 | Roll angle was -7.1705 centered at 04:20 with sector rotation. Moonappreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 10/23/2015 | 10/23/2015 | Roll angle was -1.668 with sector rotation. Moonappreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 6/27/2015 | 6/27/2015 | No Roll centered at 14:17z with sector rotation. Moonappreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 5/29/2015 | 5/29/2015 | Roll angle was -2.306 at 4:47z with sector rotation. Moonappreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 4/29/2015 | 4/29/2015 | Roll angle was -4.701 at 12:29z with sector rotation. Moonappreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 3/30/2015 | 3/30/2015 | Roll angle was -5.238 at 16:49z with sector rotation. Moonappreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 3/1/2015 | 3/1/2015 | Roll angle was -4.048 at 0:34z with sector rotation. Moonappreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 1/30/2015 | 1/30/2015 | Roll angle was -5.674 at 8:22z with sector rotation. Moonappreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 12/31/2014 | 12/31/2014 | Roll angle was -8.982 at 19:38z with sector rotation. Moon appreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 12/2/2014 | 12/2/2014 | Roll angle was -10.841 at 8:41z with sector rotation. Moon appreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 11/3/2014 | 11/3/2014 | Roll angle was -6.090 at 1:08z with sector rotation. Moon appreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 10/4/2014 | 10/4/2014 | No roll centered at 17:29z with sector rotation. Moon appreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 6/9/2014 | 6/9/2014 | No roll centered at 3:48z with sector rotation. Moon appreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 5/10/2014 | 5/10/2014 | Roll angle was -4.178 and centered at 13:13z with sector rotation. Moon appreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 4/10/2014 | 4/10/2014 | Roll angle was -4.977 and centered at 20:53z with sector rotation. Moon appreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 3/12/2014 | 3/12/2014 | Roll angle was -3.945 and centered at 1:12z with sector rotation. Moon appreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 2/10/2014 | 2/10/2014 | Roll angle was -3.714 and centered at 5:34z with sector rotation. Moon appreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 1/11/2014 | 1/11/2014 | Roll angle was -6.728 and centered at 9:59z with sector rotation. Moon appreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 12/12/2013 | 12/12/2013 | Roll angle was -9.440 and centered at 19:35z with sector rotation. Moon appreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 11/13/2013 | 11/13/2013 | Roll angle was -7.9808 and centered at 6:57z with sector rotation. Moon appreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 10/14/2013 | 10/14/2013 | Roll angle was -1.305 and centered at 21:39z with sector rotation. Moon appreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 5/21/2013 | 5/21/2013 | No roll centered at 8:43z with sector rotation. Moon appreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 4/21/2013 | 4/21/2013 | Roll angle was -3.8818 degrees centered at 19:42z with sector rotation. Moon appreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 3/23/2013 | 3/23/2013 | Roll angle was -3.3196 degrees centered at 3:29z with sector rotation. Moonappreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 2/21/2013 | 2/21/2013 | Roll angle was -1.7121 degrees centered at 9:31z with sector rotation. Moon appreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 1/23/2013 | 1/23/2013 | Roll angle was -3.3826 degrees centered at 12:13z with sector rotation. Moon appreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 12/23/2012 | 12/23/2012 | Roll angle was -7.7668 degrees centered at 15:01z with sector rotation. Moon appreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 11/23/2012 | 11/23/2012 | Roll angle was -9.4289 degrees centered at 21:18z with sector rotation. Moon appreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 10/25/2012 | 10/25/2012 | Roll angle was -4.0485 degrees centered at 6:258z with sector rotation. Moon appreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 5/31/2012 | 5/31/2012 | No roll and centered at 14:47. |
| VIIRS Lunar Calibration | 4/2/2012 | 4/2/2012 | Roll angle was -3.9893 degrees centered at 23:06 with sector rotation. Moon appreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 4/2/2012 | 4/2/2012 | Roll angle was -3.2275 degrees centered at 10:20z with sector rotation. Moon appreared in the middle of EV sector. Calculated lunar F-factor using GIRO. |
| VIIRS Lunar Calibration | 3/3/2012 | 3/3/2012 | Roll angle was -6.1512 degrees without sector rotation. Moon only appreared in SV. Cannot be used for lunar Cal. |
| VIIRS Lunar Calibration | 2/3/2012 | 2/3/2012 | Roll angle was -5.4452 degrees without sector rotation. Moon only appreared in SV. Cannot be used for lunar Cal. |
| VIIRS Lunar Calibration | 1/4/2012 | 1/4/2012 | Roll angle was -9.488 degrees without sector rotation. Moon only appreared in SV. Cannot be used for lunar Cal. |
| DNB Stray Light Correction | 7/1/2021 | 7/6/2021 | Detected and initiated correction of using in IDPS the June DNB Stray Light Correction LUT in July |
| DNB Stray Light Correction | 4/3/2020 | Prepare and update VIIRS-SDR-DNB-STRAY-LIGHT-CORRECTION LUT with DNB observations around new moon day (4/3/2020 4:09:00 PM) | |
| DNB Stray Light Correction | 3/6/2020 | Prepare and update VIIRS-SDR-DNB-STRAY-LIGHT-CORRECTION LUT with DNB observations around new moon day (3/6/2020 1:24:00 PM) | |
| DNB Stray Light Correction | 2/14/2020 | Prepare and update VIIRS-SDR-DNB-STRAY-LIGHT-CORRECTION LUT with DNB observations around new moon day (2/14/2020 12:24:00 PM) | |
| DNB Stray Light Correction | 1/30/2020 | Prepare and update VIIRS-SDR-DNB-STRAY-LIGHT-CORRECTION LUT with DNB observations around new moon day (1/30/2020 8:43:00 PM) | |
| DNB Stray Light Correction | 1/10/2020 | Prepare and update VIIRS-SDR-DNB-STRAY-LIGHT-CORRECTION LUT with DNB observations around new moon day (1/10/2020 1:21:00 PM) | |
| DNB Stray Light Correction | 12/13/2019 | Prepare and update VIIRS-SDR-DNB-STRAY-LIGHT-CORRECTION LUT with DNB observations around new moon day (12/13/2019 1:39:00 PM) | |
| DNB Stray Light Correction | 11/8/2019 | Prepare and update VIIRS-SDR-DNB-STRAY-LIGHT-CORRECTION LUT with DNB observations around new moon day (11/8/2019 1:09:00 PM) | |
| DNB Stray Light Correction | 10/11/2019 | Prepare and update VIIRS-SDR-DNB-STRAY-LIGHT-CORRECTION LUT with DNB observations around new moon day (10/11/2019 11:04:00 AM) | |
| DNB Stray Light Correction | 9/13/2019 | Prepare and update VIIRS-SDR-DNB-STRAY-LIGHT-CORRECTION LUT with DNB observations around new moon day (9/13/2019 12:10:00 PM) | |
| DNB Stray Light Correction | 8/8/2019 | Prepare and update VIIRS-SDR-DNB-STRAY-LIGHT-CORRECTION LUT with DNB observations around new moon day (8/8/2019 6:45:00 PM) | |
| DNB Stray Light Correction | 7/12/2019 | Prepare and update VIIRS-SDR-DNB-STRAY-LIGHT-CORRECTION LUT with DNB observations around new moon day (7/12/2019 2:58:00 PM) | |
| DNB Stray Light Correction | 6/13/2019 | Prepare and update VIIRS-SDR-DNB-STRAY-LIGHT-CORRECTION LUT with DNB observations around new moon day (6/13/2019 8:23:00 PM) | |
| DNB Stray Light Correction | 5/17/2019 | Prepare and update VIIRS-SDR-DNB-STRAY-LIGHT-CORRECTION LUT with DNB observations around new moon day (5/17/2019 5:02:00 PM) | |
| DNB Gain Ratio & Dark Offset Calibration | 2/11/2021 | 2/18/2021 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 1/13/2021 | 1/21/2021 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 12/13/2020 | 12/28/2020 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 11/15/2020 | 11/25/2020 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 10/17/2020 | 10/23/2020 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 9/17/2020 | 9/24/2020 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 8/19/2020 | 8/27/2020 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 7/20/2020 | 7/30/2020 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 6/21/2020 | 7/2/2020 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 5/22/2020 | 6/4/2020 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 4/23/2020 | 5/7/2020 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 3/24/2020 | 4/3/2020 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 2/23/2020 | 3/6/2020 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 1/24/2020 | 1/30/2020 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 12/26/2019 | 1/10/2020 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 11/25/2019 | 12/13/2019 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 10/28/2019 | 11/8/2019 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 9/28/2019 | 10/11/2019 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 8/30/2019 | 9/13/2019 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 8/1/2019 | 8/8/2019 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 7/2/2019 | 7/12/2019 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 6/3/2019 | 6/13/2019 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 5/4/2019 | 5/17/2019 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 4/5/2019 | 4/12/2019 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 3/6/2019 | 3/15/2019 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 2/4/2019 | 2/15/2019 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 1/5/2019 | 1/18/2019 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 12/7/2018 | 12/14/2018 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 11/7/2018 | 11/16/2018 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 10/8/2018 | 10/19/2018 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 9/9/2018 | 9/20/2018 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 8/11/2018 | 8/23/2018 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 7/13/2018 | 7/26/2018 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 6/13/2018 | 6/22/2018 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 5/15/2018 | 5/24/2018 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 4/15/2018 | 4/27/2018 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 3/17/2018 | 3/30/2018 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 2/15/2018 | 2/23/2018 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 1/16/2018 | 1/26/2018 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 12/18/2017 | 12/28/2017 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 11/18/2017 | 11/30/2017 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 10/19/2017 | 11/3/2017 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 9/20/2017 | 10/6/2017 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 8/21/2017 | 9/7/2017 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 7/23/2017 | 8/9/2017 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 6/24/2017 | 7/6/2017 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 5/25/2017 | 6/16/2017 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 4/26/2017 | 5/18/2017 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 3/28/2017 | 4/20/2017 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 2/26/2017 | 3/16/2017 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 1/28/2017 | 3/8/2017 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 12/29/2016 | 1/12/2017 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| Event | Category | StartDate | EndDate | Notes |
|---|---|---|---|---|
| OBC BB WUCD | TEB Calibration | 3/15/2021 | 3/17/2021 | The onboard blackbody warm-up/cool-down test was performed. TEB offset (c0) and nonlinearity (c2) coefficients were characterized and compared with prelaunch values. |
| Cloud IDPS Block 2.3_Mx0 Transition to Operations | Sofware/LUT Update | 2/4/2021 | VIIRS SDR Geolocation Algorithm Correction (VIGMU), to resolve a discrepency in the VIIRS optical model (ADR 9171). The quality of VIIRS geolocation products is not significantly affected. | |
| IDPS Block 2.2_Mx1.0 Transition to Operations | Sofware/LUT Update | 7/28/2020 | Terrain Corrected Geo-locations for VIIRS Imagery EDRs (CCR 4646) - S-NPP and NOAA-20 VIIRS Imagery EDRs will not display navigation shifts of environmental features in higher elevations with the new Terrain Corrected geo-locations software applied. | |
| OBC BB WUCD | TEB Calibration | 3/10/2020 | 3/12/2020 | The onboard blackbody warm-up/cool-down test was performed. TEB offset (c0) and nonlinearity (c2) coefficients were characterized and compared with prelaunch values. |
| IDPS Block 2.1_Mx8.0 Transition to Operations | Sofware/LUT Update | 1/29/2020 | Operational implementation of the CrIS Polarization Correction (ADR 8760) Small changes in VIIRS-CrIS BT biases (<0.01 K) expected. | |
| Solar vector anomaly | Anomaly | 1/16/2020 | 1/17/2020 | The JPL planetary ephemeris ancillary file was corrupted in the binary LUT. The duplicated records led to a failure in indexing and time interpolation. It was corrected and became normal. |
| DNB Electronic bias change | Anomaly | 1/8/2020 | Unexpected sudden change of the HGS electronic bias after a flight software update, yielding increased striping in DNB SDRs in particular at high scan angles. Striping was resolved by the following Monthly LUT update in late Jan 2020 | |
| IDPS Block 2.1_Mx7 Transition to Operations | Sofware/LUT Update | 10/15/2019 | 1. VIIRS geolocation code and LUT change to replace hard coded GEO parameters and to enable support of both sides of the scan control electronics (ADR# 8788, CCR# 4185) 2. Remove obsolete VIIRS SDR COEFF-A, COEEF-B, and GAIN LUTs to reduce risk of future processing failures (ADR# 8785, CCR# 4148) VIIRS GEO and SDR products are not affected by these code and LUT changes. | |
| IDPS Block 2.1_Mx6 Transition to Operations | Sofware/LUT Update | 7/25/2019 | VIIRS SDR code and Emissive LUT were changed to correct TEB calibration biases during WUCD events (ADR# 8731, CCR# 4068) Impacts to TEB SDRs during WUCD: up to 0.1 K (daily averaged) for S-NPP; up to 0.05 K (daily averaged) for NOAA-20. | |
| SDSM collection freqeuncy change | Misc | 5/13/2019 | Changed to once a week | |
| IDPS Block 2.1_Mx5 Transition to Operations | Sofware/LUT Update | 3/25/2019 | VIIRS SDR code and QA LUT changes to improve VIIRS radiance limit verification and RSB saturation rollover flagging 9ADR# 8197/8575, CCR# 3966) Major impacts: 1. Improved M6 saturation rollover flagging for NOAA-20 and S-NPP. 2. Improved RSB reflectance verification at twilight regions for NOAA-20 and S-NPP. 3. Address TEB radiance and brightness temperature mismatch issue, especially at cold scene temperatures, for NOAA-20 TEBs. | |
| OBC BB WUCD | TEB Calibration | 3/19/2019 | 3/21/2019 | The onboard blackbody warm-up/cool-down test was performed. TEB offset (c0) and nonlinearity (c2) coefficients were characterized and compared with prelaunch values. |
| signal drops in SD and SDSM observations | Anomaly | 2/24/2019 | The H factors dropped similarly. The F factors also changed initially, but then returned to near the original levels after the updated H factors were applied. SWIR bands (I3, M8-M11) still have the increased F factors (by about 0.5%) | |
| DNB Electronic status change | Anomaly | 1/21/2019 | 2/4/2019 | Unexpected sudden change of the HGS electronic bias after a flight software update, yielding increased striping in DNB SDRs in particular at high scan angles. Image quality restored after the HGS electronic bias back to the normal level on 2/4/2019. |
| IDPS Block 2.1_Mx4 Transition to Operations | Sofware/LUT Update | 12/17/2018 | Updated Emissive LUT to accommodate platform-dependent cold FPA temperature setpoints (ADR#8295, CCR# 3965) | |
| IDPS Block 2.1_Mx3 Transition to Operations | Sofware/LUT Update | 10/3/2018 | No change to VIIRS SDR algorithms | |
| IDPS Block 2.1_Mx2 Transition to Operations | Sofware/LUT Update | 7/2/2018 | Corrected errors of VIIRS SDR RSBAutoCal offset & scale factors, which were applied in wrong order (ADR #8281, 474-CCR-17-3494) Fixed potential over indexing in VIIRS GTM Imagery causing 1958 dates during some maneuvers. Updated CFG file to enable monthly use of VIIRS SDR DNB Stray Light LUT (DR #8562) | |
| OBC BB WUCD | TEB Calibration | 6/18/2018 | 6/20/2018 | The onboard blackbody warm-up/cool-down test was performed. TEB offset (c0) and nonlinearity (c2) coefficients were characterized and compared with prelaunch values. |
| IDPS Block 2.1_Mx1 Transition to Operations | Sofware/LUT Update | 4/30/2018 | Updated VIIRS product dictionary (increased M6 maximum radiance) to improve M6 saturation rollover flagging (ADR #8393, 474-CCR-17-3468) | |
| OBC BB WUCD | TEB Calibration | 3/12/2018 | 3/14/2018 | The onboard blackbody warm-up/cool-down test was performed. TEB offset (c0) and nonlinearity (c2) coefficients were characterized and compared with prelaunch values. |
| IDPS Block 2.1_Mx0 Transition to Operations | Sofware/LUT Update | 3/5/2018 | No change to VIIRS SDR algorithms | |
| F-factor drops in M4 and M5 | Anomaly | 2/16/2018 | 3/7/2018 | F-factor drops for bands M4 and M5 on 2/16/2018 were caused by the a Data Acquisition Schedule (DAS) error during DNB calibration |
| OBC BB WUCD | TEB Calibration | 12/18/2017 | 12/20/2017 | The onboard blackbody warm-up/cool-down test was performed. TEB offset (c0) and nonlinearity (c2) coefficients were characterized and compared with prelaunch values. |
| OBC BB WUCD | TEB Calibration | 9/18/2017 | 9/20/2017 | The onboard blackbody warm-up/cool-down test was performed. TEB offset (c0) and nonlinearity (c2) coefficients were characterized and compared with prelaunch values. |
| IDPS Block 2.0 Mx_3 Transition to Operations | Sofware/LUT Update | 7/28/2017 | Updated PRO to expect VIIRS M11 channel at Night on J01 per 472-CCR-14-0802. | |
| OBC BB WUCD | TEB Calibration | 6/19/2017 | 6/21/2017 | The onboard blackbody warm-up/cool-down test was performed. TEB offset (c0) and nonlinearity (c2) coefficients were characterized and compared with prelaunch values. |
| IDPS Block 2.0 Mx_2 Transition to Operations | Sofware/LUT Update | 5/30/2017 | No change to VIIRS SDR algorithms | |
| IDPS Block 2.0 Mx_1 Transition to Operations | Sofware/LUT Update | 4/10/2017 | No change to VIIRS SDR algorithms | |
| OBC BB WUCD | TEB Calibration | 3/13/2017 | 3/15/2017 | The onboard blackbody warm-up/cool-down test was performed. TEB offset (c0) and nonlinearity (c2) coefficients were characterized and compared with prelaunch values. |
| IDPS Block 2.0 Mx_0 Transition to Operations | Sofware/LUT Update | 3/8/2017 | VIIRS GEO code and LUT changes to accommodate J1 DNB aggregation mode change (ADR# 8160, CCR# 2890). | |
| DNB Special collection over the South Atlantic Anomaly region | Misc | 1/27/2017 | 1/27/2017 | Special operating procedure VROPs were performed over the South Atlantic Anomaly region. Following data analysis verified DNB HGS pixels hit by high energy particles are detected and eliminated by the DNB HGS/B thresholding algorithm. |
| OBC BB WUCD | TEB Calibration | 12/12/2016 | 12/14/2016 | The onboard blackbody warm-up/cool-down test was performed. TEB offset (c0) and nonlinearity (c2) coefficients were characterized and compared with prelaunch values. |
| OBC BB WUCD | TEB Calibration | 9/19/2016 | 9/21/2016 | The onboard blackbody warm-up/cool-down test was performed. TEB offset (c0) and nonlinearity (c2) coefficients were characterized and compared with prelaunch values. |
| OBC BB WUCD | TEB Calibration | 6/13/2016 | 6/15/2016 | The onboard blackbody warm-up/cool-down test was performed. TEB offset (c0) and nonlinearity (c2) coefficients were characterized and compared with prelaunch values. |
| OBC BB WUCD | TEB Calibration | 3/14/2016 | 3/16/2016 | The onboard blackbody warm-up/cool-down test was performed. TEB offset (c0) and nonlinearity (c2) coefficients were characterized and compared with prelaunch values. |
| IDPS Mx_8.11 Transition to Operations | Sofware/LUT Update | 12/17/2015 | No change to VIIRS SDR algorithms | |
| OBC BB WUCD | TEB Calibration | 12/14/2015 | 12/16/2015 | The onboard blackbody warm-up/cool-down test was performed. TEB offset (c0) and nonlinearity (c2) coefficients were characterized and compared with prelaunch values. |
| OBC BB WUCD | TEB Calibration | 9/14/2015 | 9/16/2015 | The onboard blackbody warm-up/cool-down test was performed. TEB offset (c0) and nonlinearity (c2) coefficients were characterized and compared with prelaunch values. |
| IDPS Mx_8.9/8.10 Transition to Operations | Sofware/LUT Update | 6/22/2015 | Updated S-NPP EBBT LUT change to address discrepencies between TEB radiance and BT limits. | |
| OBC BB WUCD | TEB Calibration | 6/17/2015 | 6/19/2015 | The onboard blackbody warm-up/cool-down test was performed. TEB offset (c0) and nonlinearity (c2) coefficients were characterized and compared with prelaunch values. |
| OBC BB WUCD | TEB Calibration | 3/16/2015 | 3/18/2015 | The onboard blackbody warm-up/cool-down test was performed. TEB offset (c0) and nonlinearity (c2) coefficients were characterized and compared with prelaunch values. |
| OBC BB WUCD | TEB Calibration | 12/15/2014 | 12/17/2014 | The onboard blackbody warm-up/cool-down test was performed. TEB offset (c0) and nonlinearity (c2) coefficients were characterized and compared with prelaunch values. |
| OBC BB WUCD | TEB Calibration | 9/15/2014 | 9/17/2014 | The onboard blackbody warm-up/cool-down test was performed. TEB offset (c0) and nonlinearity (c2) coefficients were characterized and compared with prelaunch values. |
| OBC BB WUCD | TEB Calibration | 6/23/2014 | 6/25/2014 | The onboard blackbody warm-up/cool-down test was performed. TEB offset (c0) and nonlinearity (c2) coefficients were characterized and compared with prelaunch values. |
| SDSM collection duration change | Misc | 5/23/2014 | Changed to 8min to 5min SDSM operation to redude SDSM motor movements | |
| SDSM collection freqeuncy change | Misc | 5/16/2014 | Changed to 3 times per week (Mon/Wed/Fri) | |
| OBC BB WUCD | TEB Calibration | 3/17/2014 | 3/19/2014 | The onboard blackbody warm-up/cool-down test was performed. TEB offset (c0) and nonlinearity (c2) coefficients were characterized and compared with prelaunch values. |
| H-factor flattening anomaly | Anomaly | 2/4/2014 | 5/19/2014 | Solar Diffuser degradation (H-factor) went into flattening mode which cause sudden updates of F-factors. It also affected DNBLGS gain calibration. Reference: Shao, X., et al. (2019). "Surface Roughness-Induced Spectral Degradation of Multi-Spaceborne Solar Diffusers Due to Space Radiation Exposure." IEEE Transactions on Geoscience and Remote Sensing: 1-14. |
| OBC BB WUCD | TEB Calibration | 12/16/2013 | 12/18/2013 | The onboard blackbody warm-up/cool-down test was performed. TEB offset (c0) and nonlinearity (c2) coefficients were characterized and compared with prelaunch values. |
| OBC BB WUCD | TEB Calibration | 9/16/2013 | 9/18/2013 | The onboard blackbody warm-up/cool-down test was performed. TEB offset (c0) and nonlinearity (c2) coefficients were characterized and compared with prelaunch values. |
| OBC BB WUCD | TEB Calibration | 6/17/2013 | 6/19/2013 | The onboard blackbody warm-up/cool-down test was performed. TEB offset (c0) and nonlinearity (c2) coefficients were characterized and compared with prelaunch values. |
| Modulated RSR update | Sofware/LUT Update | 4/4/2013 | The modulated VIIRS RSRs that capture changes in RSR shape due to the RTA throughput degradation anomaly as of 1 February 2013 went into operations on 4 April 2013, in an updated version of VIIRS-SDR-RSR-LUT. https://ncc.nesdis.noaa.gov/VIIRS/index.php | |
| OBC BB WUCD | TEB Calibration | 3/18/2013 | 3/20/2013 | The onboard blackbody warm-up/cool-down test was performed. TEB offset (c0) and nonlinearity (c2) coefficients were characterized and compared with prelaunch values. |
| OBC BB WUCD | TEB Calibration | 12/17/2012 | 12/19/2012 | The onboard blackbody warm-up/cool-down test was performed. TEB offset (c0) and nonlinearity (c2) coefficients were characterized and compared with prelaunch values. |
| OBC BB WUCD | TEB Calibration | 9/10/2012 | 9/12/2012 | The onboard blackbody warm-up/cool-down test was performed. TEB offset (c0) and nonlinearity (c2) coefficients were characterized and compared with prelaunch values. |
| OBC BB WUCD | TEB Calibration | 5/22/2012 | 5/25/2012 | The onboard blackbody warm-up/cool-down test was performed. TEB offset (c0) and nonlinearity (c2) coefficients were characterized and compared with prelaunch values. |
| Spacecraft Sun point Anomaly | Anomaly | 3/24/2012 | 3/26/2012 | SD F-factor dropped in most of RSB bands. |
| SDSM collection freqeuncy change | Misc | 2/28/2012 | 5/15/2014 | Changed to once per day |
| SDSM collection freqeuncy change | Misc | 2/24/2012 | 2/28/2012 | Changed to every orbit |
| Yaw Maneuvers | Maneuver | 2/15/2012 | 2/16/2012 | 15 yaw maneuvers perfomed to estimate on-orbit screen transmittance functions and BRDF functions for accurate H-factor estimations. Reference: Choi, T. and C. Cao (2019). "S-NPP VIIRS On-Orbit Calibration Coefficient Improvements With Yaw Maneuver Reanalysis." IEEE Transactions on Geoscience and Remote Sensing 57(10): 7460-7465. |
| OBC BB WUCD | TEB Calibration | 2/6/2012 | 2/10/2012 | The onboard blackbody warm-up/cool-down test was performed. TEB offset (c0) and nonlinearity (c2) coefficients were characterized and compared with prelaunch values. |
| SWIR, TEB, and DNB data avaiable | Misc | 1/20/2012 | Reached opertaional temps. Of S/M IR(79K), LW IR (79.9K), DNB(247K) | |
| SDSM collection freqeuncy change | Misc | 1/19/2012 | 1/24/2012 | Changed to once per day |
| VIIRS Cryo-Cooler Door Open | Misc | 1/18/2012 | Before Cryo-cooler door open, the SWIR, TEB, and DNB bands data were not avaiable because of high noise. | |
| Nadir Door Open | Misc | 11/21/2011 | VIIRS started Earth View observations. | |
| VIIRS Activation | Misc | 11/8/2011 | VIIRS was powered and started producing on-orbit calibrator observations. Provides BB and SD observations. | |
| SDSM Collection Start | Misc | 11/8/2011 | 1/19/2012 | Solar Diffuser Stablity Monitor (SDSM) started collections in every orbit for H-factor calcuation. |
| Event | StartDate | EndDate | Notes |
|---|---|---|---|
| VIIRS Lunar Calibration | 2/23/2021 | 2/23/2021 | No Roll centered at 3:08. Calculated lunar F-factors using GIRO model |
| VIIRS Lunar Calibration | 1/24/2021 | 1/24/2021 | Roll angle -2.97 centered at 9:17. Calculated lunar F-factors using GIRO model |
| VIIRS Lunar Calibration | 12/25/2020 | 12/25/2020 | Roll angle -7.79 centered at 12:09. Calculated lunar F-factors using GIRO model |
| VIIRS Lunar Calibration | 11/25/2020 | 11/25/2020 | Roll angle -4.666 centered at 15:05. Calculated lunar F-factors using GIRO model |
| VIIRS Lunar Calibration | 6/1/2020 | 6/2/2020 | Roll angle -2.43 centered at 23:54. Calculated lunar F-factors using GIRO model |
| VIIRS Lunar Calibration | 5/3/2020 | 5/3/2020 | Roll angle -2.43 centered at 17:44. Calculated lunar F-factors using GIRO model |
| VIIRS Lunar Calibration | 4/4/2020 | 4/4/2020 | No Roll centered at 09:54. Calculated lunar F-factors using GIRO model |
| VIIRS Lunar Calibration | 3/6/2020 | 3/6/2020 | No Roll centered at 22:44. Calculated lunar F-factors using GIRO model |
| VIIRS Lunar Calibration | 2/5/2020 | 2/5/2020 | Roll angle -2.03 centered at 08:14. Calculated lunar F-factors using GIRO model |
| VIIRS Lunar Calibration | 12/7/2019 | 12/7/2019 | Roll angle -6.57 centered at 19:05. Calculated lunar F-factors using GIRO model |
| VIIRS Lunar Calibration | 11/7/2019 | 11/7/2019 | No Roll centered at 23:40. Calculated lunar F-factors using GIRO model |
| VIIRS Lunar Calibration | 6/13/2019 | 6/13/2019 | No Roll centered at 04:20. Calculated lunar F-factors using GIRO model |
| VIIRS Lunar Calibration | 5/14/2019 | 5/14/2019 | Roll angle -2.67 centered at 22:09. Calculated lunar F-factors using GIRO model. Ref. Choi, T., et al. (2020). "NOAA-20 VIIRS Reflective Solar Band Postlaunch Calibration Updates Two Years In-Orbit." IEEE Transactions on Geoscience and Remote Sensing: 1-10. |
| VIIRS Lunar Calibration | 4/15/2019 | 4/15/2019 | Roll angle -1.37 centered at 16:00. Calculated lunar F-factors using GIRO model |
| VIIRS Lunar Calibration | 3/17/2019 | 3/17/2019 | No Roll centered at 08:10. Calculated lunar F-factors using GIRO model |
| VIIRS Lunar Calibration | 2/15/2019 | 2/15/2019 | Roll angle -1.35 centered at 22:44. Calculated lunar F-factors using GIRO model |
| VIIRS Lunar Calibration | 1/17/2019 | 12/18/2018 | Roll angle -5.425 centered at 09:58. Calculated lunar F-factors using GIRO model |
| VIIRS Lunar Calibration | 1/6/2019 | 1/6/2019 | Roll angle -6.061 centered at 16:09. Calculated lunar F-factors using GIRO model |
| VIIRS Lunar Calibration | 12/18/2018 | 12/18/2018 | Roll angle -7.868 centered at 17:56. Calculated lunar F-factors using GIRO model |
| VIIRS Lunar Calibration | 11/19/2018 | 11/19/2018 | Roll angle -2.802 centered at 1:54. Calculated lunar F-factors using GIRO model |
| VIIRS Lunar Calibration | 6/23/2018 | 6/23/2018 | No Roll centered at 13:42. Calculated lunar F-factors using GIRO model |
| VIIRS Lunar Calibration | 5/25/2018 | 5/25/2018 | Roll angle -1.58 centered at 05:53. Calculated lunar F-factors using GIRO model |
| VIIRS Lunar Calibration | 4/25/2018 | 4/25/2018 | Roll angle -2.54 centered at 20:21. Calculated lunar F-factors using GIRO model |
| VIIRS Lunar Calibration | 3/27/2018 | 3/27/2018 | Roll angle -1.29 centered at 12:35. Calculated lunar F-factors using GIRO model |
| VIIRS Lunar Calibration | 2/26/2018 | 2/26/2018 | Roll angle -1.52 centered at 4:46. Calculated lunar F-factors using GIRO model |
| VIIRS Lunar Calibration | 1/27/2018 | 1/27/2018 | Roll angle -4.683 centered at 19:22. SWIR data available. |
| VIIRS Lunar Calibration | 12/29/2017 | 12/29/2017 | Roll angle -7.2016. The SWIR band images were not avaiable. |
| DNB Stray Light Correction | 12/13/2019 | Prepare and update VIIRS-SDR-DNB-STRAY-LIGHT-CORRECTION LUT with DNB observations around new moon day (12/13/2019 1:39:00 PM) | |
| DNB Stray Light Correction | 11/8/2019 | Prepare and update VIIRS-SDR-DNB-STRAY-LIGHT-CORRECTION LUT with DNB observations around new moon day (11/8/2019 1:09:00 PM) | |
| DNB Stray Light Correction | 10/11/2019 | Prepare and update VIIRS-SDR-DNB-STRAY-LIGHT-CORRECTION LUT with DNB observations around new moon day (10/11/2019 11:03:00 AM) | |
| DNB Stray Light Correction | 9/13/2019 | Prepare and update VIIRS-SDR-DNB-STRAY-LIGHT-CORRECTION LUT with DNB observations around new moon day (9/13/2019 12:10:00 PM) | |
| DNB Stray Light Correction | 8/8/2019 | Prepare and update VIIRS-SDR-DNB-STRAY-LIGHT-CORRECTION LUT with DNB observations around new moon day (8/8/2019 6:45:00 PM) | |
| DNB Stray Light Correction | 7/12/2019 | Prepare and update VIIRS-SDR-DNB-STRAY-LIGHT-CORRECTION LUT with DNB observations around new moon day (7/12/2019 12:02:00 PM) | |
| DNB Stray Light Correction | 6/13/2019 | Prepare and update VIIRS-SDR-DNB-STRAY-LIGHT-CORRECTION LUT with DNB observations around new moon day (6/13/2019 8:23:00 PM) | |
| DNB Stray Light Correction | 5/17/2019 | Prepare and update VIIRS-SDR-DNB-STRAY-LIGHT-CORRECTION LUT with DNB observations around new moon day (5/17/2019 5:17:00 PM) | |
| DNB Stray Light Correction | 4/18/2019 | Prepare and update VIIRS-SDR-DNB-STRAY-LIGHT-CORRECTION LUT with DNB observations around new moon day (4/18/2019 10:51:00 AM) | |
| DNB Stray Light Correction | 3/15/2019 | Prepare and update VIIRS-SDR-DNB-STRAY-LIGHT-CORRECTION LUT with DNB observations around new moon day (3/15/2019 4:38:00 PM) | |
| DNB Stray Light Correction | 2/15/2019 | Prepare and update VIIRS-SDR-DNB-STRAY-LIGHT-CORRECTION LUT with DNB observations around new moon day (2/15/2019 4:35:00 PM) | |
| DNB Stray Light Correction | 1/18/2019 | Prepare and update VIIRS-SDR-DNB-STRAY-LIGHT-CORRECTION LUT with DNB observations around new moon day (1/18/2019 2:14:00 PM) | |
| DNB Stray Light Correction | 12/20/2018 | Prepare and update VIIRS-SDR-DNB-STRAY-LIGHT-CORRECTION LUT with DNB observations around new moon day (12/20/2018 3:56:00 PM) | |
| DNB Stray Light Correction | 11/16/2018 | Prepare and update VIIRS-SDR-DNB-STRAY-LIGHT-CORRECTION LUT with DNB observations around new moon day (11/16/2018 7:57:00 PM) | |
| DNB Stray Light Correction | 10/19/2018 | Prepare and update VIIRS-SDR-DNB-STRAY-LIGHT-CORRECTION LUT with DNB observations around new moon day (10/19/2018 11:51:00 AM) | |
| DNB Stray Light Correction | 9/20/2018 | Prepare and update VIIRS-SDR-DNB-STRAY-LIGHT-CORRECTION LUT with DNB observations around new moon day (9/20/2018 4:42:00 PM) | |
| DNB Gain Ratio & Dark Offset Calibration | 2/11/2021 | 2/18/2021 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 1/13/2021 | 1/21/2021 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 12/14/2020 | 12/28/2020 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 11/15/2020 | 11/25/2020 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 10/16/2020 | 10/23/2020 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 9/17/2020 | 9/24/2020 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 8/19/2020 | 8/27/2020 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 7/20/2020 | 7/30/2020 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 6/21/2020 | 7/2/2020 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 5/22/2020 | 6/4/2020 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 4/23/2020 | 5/7/2020 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 3/24/2020 | 4/3/2020 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 2/23/2020 | 3/6/2020 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 1/24/2020 | 1/30/2020 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 12/26/2019 | 1/10/2020 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 11/26/2019 | 12/13/2019 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 10/28/2019 | 11/8/2019 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 9/28/2019 | 10/11/2019 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 8/30/2019 | 9/13/2019 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 8/1/2019 | 8/8/2019 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 7/2/2019 | 7/12/2019 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 6/3/2019 | 6/13/2019 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 5/4/2019 | 5/17/2019 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 4/5/2019 | 4/12/2019 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 3/6/2019 | 3/15/2019 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 2/4/2019 | 2/15/2019 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 1/5/2019 | 1/18/2019 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 12/7/2018 | 12/14/2018 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 11/7/2018 | 11/16/2018 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 10/8/2018 | 10/19/2018 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 9/9/2018 | 9/20/2018 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 8/11/2018 | 8/23/2018 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 7/13/2018 | 7/26/2018 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 6/13/2018 | 6/22/2018 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 5/15/2018 | 5/24/2018 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 4/15/2018 | 4/27/2018 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 3/17/2018 | 3/30/2018 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 2/15/2018 | 2/26/2018 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| DNB Gain Ratio & Dark Offset Calibration | 1/17/2018 | 2/8/2018 | DNB DN0 and Gain Ratios LUT update based on the data collected from special operating procedure VROPs |
| Event | Category | StartDate | EndDate | Notes |
|---|---|---|---|---|
| NOAA-20 RTA Anomaly | Anomaly | 2/14/2021 | 2/15/2021 | The NOAA-20 Rotating Telescope Assembly (RTA) stopped rotating on 14 Feb 2021 around 19:16 UTC. During this anomaly, which lasted for about six hours, VIIRS science data were permanently lost. Upon instrument recovery (~01:12 UTC on 15 Feb 2021), the VIIRS SDR team verified the return of the various SDR products to nominal |
| Cloud IDPS Block 2.3_Mx0 Transition to Operations | Software/LUT Update | 2/4/2021 | VIIRS SDR Geolocation Algorithm Correction (VIGMU), to resolve a discrepency in the VIIRS optical model (ADR 9171). The quality of VIIRS geolocation products is not significantly affected (2/4/2021 16:10 UTC) | |
| DNB calibration update | Software/LUT Update | 1/20/2021 | 2/4/2021 | VIIRS-SDR-DNB-LGS-GAINS-LUT updated to reduce residual striping in certain aggregation zones |
| IDPS Block 2.2_Mx1.0 Transition to Operations | Software/LUT Update | 7/28/2020 | Terrain Corrected Geo-locations for VIIRS Imagery EDRs (CCR 4646) - S-NPP and NOAA-20 VIIRS Imagery EDRs will not display navigation shifts of environmental features in higher elevations with the new Terrain Corrected geo-locations software applied (7/28/2020 14:15:00 UTC) | |
| Solar calibration update | Software/LUT Update | 7/2/2020 | 9/29/2020 | Five RSBAUTOCAL LUTs updated to improve solar data usability and include the 2-year SDSM analysis |
| OBC BB WUCD | TEB Calibration | 3/17/2020 | 3/19/2020 | The onboard blackbody warm-up/cool-down test was performed. TEB offset (c0) and nonlinearity (c2) coefficients were characterized and compared with prelaunch values. |
| IDPS Block 2.1_Mx8.0 Transition to Operations | Software/LUT Update | 1/29/2020 | Operational implementation of the CrIS Polarization Correction (ADR 8760) Small changes in VIIRS-CrIS BT biases (<0.01 K) expected. | |
| Solar vector anomaly | Anomaly | 1/16/2020 | 1/17/2020 | The JPL planetary ephemeris ancillary file was corrupted in the binary LUT. The duplicated records led to a failure in indexing and time interpolation. It was corrected and became normal. |
| IDPS Block 2.1_Mx7 Transition to Operations | Software/LUT Update | 10/15/2019 | 1. VIIRS geolocation code and LUT change to replace hard coded GEO parameters and to enable support of both sides of the scan control electronics (ADR# 8788, CCR# 4185) 2. Remove obsolete VIIRS SDR COEFF-A, COEEF-B, and GAIN LUTs to reduce risk of future processing failures (ADR# 8785, CCR# 4148) VIIRS GEO and SDR products are not affected by these code and LUT changes. | |
| IDPS Block 2.1_Mx6 Transition to Operations | Software/LUT Update | 7/25/2019 | VIIRS SDR code and Emissive LUT were changed to correct TEB calibration biases during WUCD events (ADR# 8731, CCR# 4068) Impacts to TEB SDRs during WUCD: up to 0.1 K (daily averaged) for S-NPP; up to 0.05 K (daily averaged) for NOAA-20. | |
| IDPS Block 2.1_Mx5 Transition to Operations | Software/LUT Update | 3/25/2019 | VIIRS SDR code and QA LUT changes to improve VIIRS radiance limit verification and RSB saturation rollover flagging 9ADR# 8197/8575, CCR# 3966) Major impacts: 1. Improved M6 saturation rollover flagging for NOAA-20 and S-NPP. 2. Improved RSB reflectance verification at twilight regions for NOAA-20 and S-NPP. 3. Address TEB radiance and brightness temperature mismatch issue, especially at cold scene temperatures, for NOAA-20 TEBs. | |
| OBC BB WUCD | TEB Calibration | 3/19/2019 | 3/21/2019 | The onboard blackbody warm-up/cool-down test was performed. TEB offset (c0) and nonlinearity (c2) coefficients were characterized and compared with prelaunch values. |
| SDSM observation freqeuncy change | Misc | 2/28/2019 | Once per week (every Monday) to reduce the motor movements. | |
| IDPS Block 2.1_Mx4 Transition to Operations | Software/LUT Update | 12/17/2018 | Updated Emissive LUT to to accommodate platform-dependent cold FPA temperature setpoints (ADR#8295, CCR# 3965) | |
| IDPS Block 2.1_Mx3 Transition to Operations | Software/LUT Update | 10/3/2018 | No change to VIIRS SDR algorithms | |
| IDPS Block 2.1_Mx2 Transition to Operations | Software/LUT Update | 7/2/2018 | Corrected errors of VIIRS SDR RSBAutoCal offset & scale factors, which were applied in wrong order (ADR #8281, 474-CCR-17-3494) Fixed potential over indexing in VIIRS GTM Imagery causing 1958 dates during some maneuvers. Updated CFG file to enable monthly use of VIIRS SDR DNB Stray Light LUT (DR #8562) | |
| OBC BB WUCD | TEB Calibration | 6/18/2018 | 6/20/2018 | The onboard blackbody warm-up/cool-down test was performed. TEB offset (c0) and nonlinearity (c2) coefficients were characterized and compared with prelaunch values. |
| Geolocation LUT update | Software/LUT Update | 5/11/2018 | 5/24/2018 | Post-MMOG update of the mounting matrix in the VIIRS-SDR-GEO-…-PARAM LUTs |
| IDPS Block 2.1_Mx1 Transition to Operations | Software/LUT Update | 4/30/2018 | Updated VIIRS product dictionary (increased M6 maximum radiance) to improve M6 saturation rollover flagging (ADR #8393, 474-CCR-17-3468) | |
| N20 RSB/DNB calibration update | Software/LUT Update | 4/12/2018 | 4/27/2018 | NOAA-20 VIIRS-SDR-F-PREDICTED-LUT and VIIRS-SDR-DNB-LGS-GAINS-LUT were updated by averaging results from offline RSBautocal calculations that used the solar diffuser degradation estimates (the H factors) based on the transmission/BRDF tables derived from the yaw maneuver measurements and from all SDSM measurements until February 28, 2018 (ADR 8655) |
| OBC BB WUCD | TEB Calibration | 4/9/2018 | 4/11/2018 | The onboard blackbody warm-up/cool-down test was performed. TEB offset (c0) and nonlinearity (c2) coefficients were characterized and compared with prelaunch values. |
| RSB calibration update | Software/LUT Update | 3/8/2018 | 3/23/2018 | VIIRS-SDR-F-PREDICTED-LUT updated using initial yaw maneuver analysis |
| IDPS Block 2.1_Mx0 Transition to Operations | Software/LUT Update | 3/5/2018 | No change to VIIRS SDR algorithms | |
| TEB response degradation | misc | 2/15/2018 | 3/15/2018 | Unexpected degradation in radiometric response of the LWIR bands was detected and investigated, ending with mid-mission outgassing |
| DNB onboard tables update | Software/LUT Update | 2/12/2018 | 2/12/2018 | DNB onboard offset table update for all gain stages in the IDPS based on the data collected from pitch maneuver |
| VIIRS Table Updates for Provisional Maturity | Software/LUT Update | 2/1/2018 | VIIRS team updated LUTs (VIIRS-SDR-COEFF-A, VIIRS-SDR-COEFF-B, VIIRS-SDR-DELTA-C, and VIIRS-SDR-QA) that enable uninterrupted production of VIIRS SDR for bands I4 and I5, improve radiometric calibration (e.g., reduce striping), and flag I3 detector #29 as inoperable (and replace its measurements with fill values). | |
| Pitch Manuver | Maneuver | 1/31/2018 | 1/31/2018 | To calculate on-orbit RVS. Wang, W., et al. (2019). "A New Method for Characterizing NOAA-20/S-NPP VIIRS Thermal Emissive Bands Response Versus Scan Using On-Orbit Pitch Maneuver Data." Remote Sensing 11(13). |
| DNB Speical LUT update | Software/LUT Update | 1/31/2018 | 2/15/2018 | DNB DN0 and Gain Ratios LUT update based on the data collected from pitch maneuver |
| Pitch maneuver | Maneuver | 1/31/2018 | 1/31/2018 | Data of deep space observation were collected during the spacecraft pitch maneuver for onboard offset update. |
| Geolocation LUT update | Software/LUT Update | 1/30/2018 | 2/6/2018 | Improved post-launch update of the mounting matrix and DNB alignment in the VIIRS-SDR-GEO-…-PARAM LUTs |
| RSB/DNB calibration update | Software/LUT Update | 1/30/2018 | 2/6/2018 | VIIRS-SDR-F-PREDICTED-LUT (for both VNIR and SWIR bands) and VIIRS-SDR-DNB-LGS-GAINS-LUT updated after cryo-cooler door open |
| Yaw Maneuvers | Maneuver | 1/25/2018 | 1/26/2018 | 15 orbits perfomed to cover operational range of the SD and SDSM solar azimuth angles. Ref: Choi, T., et al. (2020). "On-orbit NOAA-20 VIIRS solar diffuser bidirectional reflectance distribution function and screen transmittance characterization using yaw manoeuvres and regular on-orbit SDSM data." International Journal of Remote Sensing 41(17): 6503-6526. |
| OBC BB WUCD | TEB Calibration | 1/22/2018 | 1/24/2018 | The onboard blackbody warm-up/cool-down test was performed. TEB offset (c0) and nonlinearity (c2) coefficients were characterized and compared with prelaunch values. |
| DNB Special collection over the South Atlantic Anomaly region | Misc | 1/17/2018 | 1/17/2018 | Special operating procedure VROPs were performed over the South Atlantic Anomaly region. Following data analysis verified DNB HGS pixels hit by high energy particles are detected and eliminated by the DNB HGS/B thresholding algorithm. |
| OBC BB WUCD | TEB Calibration | 1/10/2018 | 1/14/2018 | The onboard blackbody warm-up/cool-down test was performed. TEB offset (c0) and nonlinearity (c2) coefficients were characterized and compared with prelaunch values. |
| N20 DELTA-C LUT update | Software/LUT Update | 1/8/2018 | 2/1/2018 | NOAA-20 VIIRS-SDR-DELTA-C-LUT was updated to correct the c-coefficient dependence on electronics and detector/OMM temperatures (ADR 8561) |
| N20 QA LUT update | Software/LUT Update | 1/8/2018 | 2/1/2018 | NOAA-20 VIIRS-SDR-QA-LUT was updated to flag the band I3 detector #29 (in product order) as inoperational because of much lower radiometric response (gain) and higher noise than the other I3 detectors (ADR 8560) |
| SDSM observation freqeuncy change | Misc | 1/5/2018 | Once per day | |
| Cryo-cooler door open | Misc | 1/3/2018 | 1/5/2018 | DNB CCD temperature stabilized near 242.15 K around 6:00 UTC on 1/4/2018. DNB data can be considered valid since that time. SWIR, Thermal bands, and DNB data available. |
| Geolocation LUT update | Software/LUT Update | 12/22/2017 | 1/5/2018 | Initial post-launch update of the mounting matrix in the VIIRS-SDR-GEO-…-PARAM LUTs |
| RSB/DNB calibration update | Software/LUT Update | 12/22/2017 | 1/5/2018 | Initial post-launch VIIRS-SDR-F-PREDICTED-LUT (for VNIR bands only) and VIIRS-SDR-DNB-LGS-GAINS-LUT update |
| VIIRS-SDR-COEFF-B-LUT Update | Software/LUT Update | 12/20/2017 | Corrected VIIRS CCA temperature lower limit to enable SDR/EDR production of M1-M7, I1-I2. The CCA temperature range was adjusted from 273-301.3K to 267.8-295.7K. | |
| SDSM observation freqeuncy change | Misc | 12/14/2017 | Changed to every other orbit. | |
| Nadir door open | Misc | 12/13/2017 | SDR product had FILL values for M1~M7, I1~I2 bands. VIIRS SDR team found the root cause. The The root cause was linked to the Circuit Card Assembly (CCA) temperature within the Electronics Module (EM). The EM is a separate unit from the VIIRS optics assembly. Whereas other temperature points (ie the VIS/NIR focal plane and scan cavity baffle) warmed up with light on the mirrors/focal planes, the EM is not impacted by light on the instrument. The CCA temperature has remained stable at 272K, which is 15K lower than S-NPP (287K) and below the lower limit in the VIIRS-SDR-COEFF-B-LUT. This out-of-range caused SDR/EDR fill. The VIIRS CCA temperature differences exist because S-NPP is on CP-B side and N-20 is on CP-A side. CP-A side naturally runs 10-15K cooler because the A-side cards are physically closer to the radiator. An emergency DRAT was convened on 12/15/17 to approve a LUT update to correct this issue. The CCA temperature range was adjusted from 273-301.3K to 267.8-295.7K. The LUT was implemented in IDPS operations on 12/20/17 at 14:00z. | |
| DNB Straylight test before nadir door open | Misc | 12/9/2017 | 12/9/2017 | Evaluated DNB stray light in the Opto-Mechanical Module (OMM) with nadir doors closed. Performed sector rotation at 90°, 180° and 270° respectively for three entire orbits, separated by orbit with no sector rotation (0°). Stored DNB observation of the OMM's internal in the EV sector with the nadir doors closed. DNB granules of the entire orbits were combined and visually analyzedfor the evaluation of stray light within the OMM. |
| SDSM observation | Misc | 11/30/2017 | Started at 02:29 in every orbit. Started to calculate SD H-factors. | |
| SD observation | Misc | 11/29/2017 | Started at 21:27. Started to calculate SD F-factors. Started DNB LGS gain calculation. | |
| VIIRS activation | Misc | 11/28/2017 | Activated at 21:06. | |
| Launch and orbit insertion | Misc | 11/18/2017 | Orbit insertion time is 10:45 |
Dept. of Commerce | NOAA | NESDIS | Website owner: STAR | Link & product disclaimers | Accessibility | Search |
Customer Survey | Privacy | Information quality | Questions about this site | STAR webmaster | Modified: 17 August 2020
Customer Survey | Privacy | Information quality | Questions about this site | STAR webmaster | Modified: 17 August 2020
