## Topic: Status of GOES-16 ABI L1b and CMI data

Date/Time Issued: June 28, 2018 1630 UTC

Product(s) or Data Impacted: GOES-16 ABI L1b and CMI data

Date/Time of Initial Impact: June 1, 2018 at 2215 UTC

Date/Time of Expected End: M-BN/A

Length of Event: M-BN/A

Details/Specifics of Change: The GOES-R Peer/Stakeholder Product Validation Review (PS-PVR) for the Advanced Baseline Imager (ABI) L1b and Cloud and Moisture Imagery (CMI) Full Maturity was held on June 1, 2018. As a result of this review, the ABI L1b and CMI products are declared fully mature.

M-B

The ABI L1b data products are calibrated and geo-located radiances of the 16 ABI bands over the Full Disk (FD) of the Earth, the Continental United States (CONUS) region, the Mesoscale (MESO) regions, as well as certain instrument calibration and engineering data. The CMI data products are reflectances for bands 1-6 and brightness temperatures for bands 7-16.

A full description including format of the ABI L1b product can be found in the Product Definition and UserM-bM-^@M-^Ys Guide (PUG) document (https://www.goes-r.gov/users/docs/PUG-L1b-vol3.pdf). A full description including format of the CMI product can also be found in the PUG document (http://www.goes-r.gov/products/docs/PUG-L2+-vol5.pdf). The algorithm used to derive the CMI product from GOES-16 ABI observations is described in detail in the M-bM-^@M-^\GOES-R Advanced Baseline Imager (ABI) Algorithm Theoretical Basis Document for Cloud and Moisture Imagery ProductM-bM-^@M-^] (https://www.goes-r.gov/products/ATBDs/baseline/Imagery_v2.0_no_color.pdf).

M-B

Full Validation maturity, by definition, means the following:

- Validation, QA, and anomaly resolution activities are ongoing.

- Incremental product improvements may still be occurring.

- Users are engaged and user feedback is assessed.

- Product performance for all products is defined and documented over a wide range of representative conditions via ongoing ground-truth and validation efforts.

- Products are operationally optimized, as necessary, considering mission parameters of cost, schedule, and technical competence as compared to user expectations.

- All known product anomalies are documented and shared with the user community.

- Product is operational.

M-B

Users of the GOES-16 ABI L1b and CMI products bear responsibility for inspecting the data and understanding the known caveats prior to use. Below is the list of c aveats that have been identified and are under analysis. Solutions are in development and testing:

1. The 0.64 M-NM-

2. There is striping in the 11.2 M-NM-

3. Low-level striping exists in the 1.61 M-NM-<m channel (band 5). The cause is believed to be similar to the striping that previously affected bands 1-3 and a similar correction is in work.

4. In rare cases, sunlight can reach the ABI by refraction of the EarthM-bM-^@M-^Ys atmosphere. It occurs once per year, for less than 1 minute, but when it occurs it effects all channels. The same impact is seen in the VNIR and IR channels during eclipse season (approximately 40 days before and after the vernal [on or about March 21] and autumnal [on or about September 21] equinoxes for approximately 45 minutes before and after satellite local midnight). See http://www.ospo.noaa.gov/Operations/GOES/eclipse.html for additional information.

5. In the 3.9 M-NM-

6. If one detector within the hundreds in the array should fail, there may be severe striping in the affected channels. A replacement detector will be identified and a full mitigation made within a few days.

7. It is possible for a detector to experience a sudden change in characteristics, although it is still functioning in the valid range. The calibration algorithm can mistake this sudden change as invalid and M-bM-^@M-^\latchM-bM-^@M-^] to the previous value creating a subtle stripe. This can happen in any channel. It happened a few times in the past year and was corrected within a few days.

8. All IR channels have a cold bias of about 0.2 K. This does not exceed the accuracy requirement of 1 K. A recent update was made to mitigate this issue and evaluation is in progress.

9. Due to the design of ABIM-bM-^@M-^Ys focal plane array, bright object avoidance (BOA) effects each band differently. Using multiple bands should be done carefully because there could be missing data in one band but not another.

10. Metadata often arrives for CMI files via GRB before the entire file is delivered.

11. There is a drift in the image start/end time which currently resets approximately every two weeks.

12. Due to the Planck relationship at 3.9 M-NM-

M-B

The full validation README with comprehensive a product quality description will be available on the NCEI website (https://www.ncdc.noaa.gov/data-access/satellite-data/goes-r-series-satellites) in the coming weeks.

M-B

Contact for further information: OSPO User Services at SPSD.UserServices@noaa.gov

Contacts for specific information on the ABI L1b data product:

Elizabeth Kline elizabeth.kline@noaa.gov

Fred Wu xiangqian.wu@noaa.gov

Contacts for specific information on the ABI CMI product:

Wayne MacKenzie wayne.mackenzie@noaa.gov

Tim Schmit tim.j.schmit@noaa.gov

Jaime Daniels jaime.daniels@noaa.gov

Web Site(s) for applicable information: See http://www.ospo.noaa.gov/Operations/messages.html for this and other satellite related messages. See http://www.goes-r.gov/spacesegment/abi.html for ABI specific information.

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