Administrative: Update 3: Implementation of GOES-16 and GOES-17 ABI Enterprise Cloud Mask Level 2+ Algorithm on or about November 29, 2021, Issued: November 23, 2021 1514 UTC

Update #3: The users should notice an improvement to cloud detection of the product consistent with the results of the CSR/ASR processing and BUFR products as listed in the 2nd table at the bottom of this notification.

Update #2: This update provides more specific user information (Additional User Information below) for the upcoming operational implementation of ECM, on or about November 29, 2021 at TBD UTC

Update #1: The estimated date of implementation is now on or about November 29, 2021 at TBD UTC

Topic: Implementation of GOES-16 and GOES-17 ABI Enterprise Cloud Mask Level 2+ Algorithm

Date/Time Issued: November 23, 2021 1514 UTC

Product(s) or Data Impacted: GOES-16 and GOES-17 Cloud Mask Products

Date/Time of Initial Impact: On or about November 29, 2021 TBD UTC

Details/Specifics of Change:

The GOES-16 and GOES-17 ABI Enterprise Cloud Mask algorithm will replace the baseline cloud mask algorithm on or about November 29, 2021 at TBD UTC. Users of the current cloud mask product will not see any interruptions to data delivery but the resultant product files will change to reflect the output of the enterprise algorithm. The Binary Cloud Mask (BCM) parameter in the current Cloud Mask will remain, however additional parameters in the netCDF4 product include:

ACM = 4 Level Cloud Mask

Cloud_robabilities = Cloud Probability

The Enterprise Cloud Mask (ECM) algorithm was developed by the Algorithm Working Group (AWG) with the capability to process multi-spectral data from multiple sources. This means that the science code can ingest data from various platforms (GOES-R ABI, VIIRS, etc.) and produce sensor-specific products using a similar “Enterprise” approach. The ECM algorithm uses a naive Bayesian approach for cloud detection; an approach that brings it into line with products generated by other NOAA instruments.

Short Names of Impacted Products:

ABI-L2-ACMF

ABI-L2-ACMC

ABI-L2-ACMM

Example file names: OR_ABI-L2-ACMF-M6_G17_s20213021440321_e20213021449388_c20213021450070.nc

OR_ABI-L2-ACMC-M6_G17_s20213021440321_e20213021449388_c20213021450070.nc

OR_ABI-L2-ACMM-M6_G17_s20213021440321_e20213021449388_c20213021450070.nc

ADD FILE NAMES

Cadence: 10 min Full Disk, 5 minute CONUS, 1 minute mesoscale

Resolution: 2 km

Additional User Information (November 18, 2021):

Data Quality Flag (DQF) Changes:

DQF Flag value	Baseline Algorithm Meaning (current product)	Enterprise Algorithm Meaning (new product)
0	Valid, good quality cloud mask	Valid, good quality cloud mask
1	Invalid pixel due to space view	Bad quality
2	Invalid or reduced quality pixel due to being outside of sensor zenith range 70 degrees	Invalid pixel due to space view
3	Invalid earth pixel due to bad data (bad or missing 11 µm BT or bad/missing clear sky 11 µm BT)	Not Used
4	Reduced quality Cloud mask (bad 3.9µm pixel)	Not Used
5	Reduced quality 0.64 µm tests	Not Used
6	Reduced quality due to other bad channels (excluding 0.64, 3.9 or 11 µm)	Degraded due to out of range focal plane temperature (FPT) or missing channel

Additional Parameters:

4-Level Mask - Enterprise Cloud Mask (ECM) combines spectral and spatial tests to produce a four-level classification of cloudiness at each pixel location. The 4 levels are:

0 = Clear

1 = Probably Clear

2 = Probably Cloudy

3 = Cloudy

Cloud Probability - Likelihood of a cloud at a given pixel location (range: 0.0 - 1.0)

GOES-16/17 ASR/CSR:

GOES-16/17 All Sky Radiances and Clear Sky Radiances derived from GOES-16/17 using Channels 7 - 16

Product Short Name	Product File Name (NetCDF)	Product File Name (BUFR)
ABI_L2_ASRF	OR-ABI-L2-ASRF-M6_v2r0_G17_sXXXXXXXXXXXXXX_eXXXXXXXXXXXXXX_cXXXXXXXXXXXXXXX.nc	ABI-L2-ASRF-M6_v2r0_g17_sXXXXXXXXXXXXXX_eXXXXXXXXXXXXXX_cXXXXXXXXXXXXXXX.bufr
ABI_L2_CSRF	OR-ABI-L2-CSRF-M6_v2r0_G17_sXXXXXXXXXXXXXX_eXXXXXXXXXXXXXX_cXXXXXXXXXXXXXX.nc	ABI-L2-CSRF-M6_v2r0_g17_sXXXXXXXXXXXXXX_eXXXXXXXXXXXXXX_cXXXXXXXXXXXXXX.bufr

Please note: This upgrade will not be performed during Critical Weather Day (CWD).

Contact Information: For information on the status of this work, please contact SPSD.Userservices@noaa.gov and ESPC Operations at ESPCOperations@noaa.gov or 301-817-3880

Web Site(s) for applicable information: N/A

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