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PNSWSH

 

Service Change Notice 17-95

National Weather Service Headquarters Silver Spring, MD

1130 AM EDT Fri Aug 18 2017

 

To:      Subscribers:

         -NOAA Weather Wire Service

         -Emergency Managers Weather Information Network

         -NOAAPORT

         Other NWS Partners and NWS Employees

 

From:    Joseph Pica

         Director, NWS Office of Observations

 

Subject: NWS Test of Alternately-Mapped Geostationary

         Operational Environmental Satellite–16 (GOES-16)

         Imagery, effective September 6, 2017

 

On or after 15 UTC Wednesday, September 6, 2017, a new test of

GOES-16 Advanced Baseline Imager (ABI) Imagery will begin on the

Satellite Broadcast Network (SBN, also known as NOAAPORT). The

products to be evaluated under this test will be very similar to

the reprojected GOES-16 Sectorized Cloud and Moisture Imagery

(SCMI) already on the SBN, except that the test products will

not be reprojected (i.e., remapped) in the same way as most of

the SBN's current SCMI. The test is to evaluate mapping the test

products to the ABI Fixed Grid, which is a projection based on

the viewing perspective of the idealized location of a satellite

in geostationary orbit.

 

The SBN feed of all GOES-16 products remains in a pre-

operational validation and testing phase. NOAA's GOES-16

satellite has not been declared operational and its data are

preliminary and undergoing testing. Users receiving these data

through any dissemination means assume all risk related to their

use of GOES-16 data and NOAA disclaims any and all warranties,

whether express or implied, including (without limitation) any

implied warranties of merchantability or fitness for a

particular purpose. These products are being added to enable the

testing of networks and systems with actual GOES-16 data and so

that users will be able to evaluate the products during this

validation/test period. 

 

It is not recommended that these preliminary products be used in

operational forecast processes. Any downstream postings of these

data should clearly convey their preliminary, non-operational

and in-testing nature. Furthermore, this data stream may be

subject to temporary unannounced data outages and modifications

during this validation and testing period.

 

GOES-16 will be moved from its current station near 89.2-89.5

degrees west longitude to the GOES-East position at 75.2 degrees

west longitude around November 2017, before it is declared

operational. Future Service Change Notices will provide further

information on the GOES-16 transition to operations and on

continuing product validation plans.

 

Refer to prior Service Change Notice 17-24 which introduced

GOES-16 SCMI to the SBN: 

 

http://www.nws.noaa.gov/os/notification/scn17-24goes16.htm

 

This test will evaluate ABI SCMI on the ABI Fixed Grid because

its use will reduce unnecessary reprojection steps and product

sizes. Whereas most ABI SCMI on the SBN's GOES-R East channel is

reprojected, the GOES-16 full disk imagery on that channel

already uses the fixed grid. If this test is successful, it is

anticipated that NOAA will transition all SBN SCMI products to

the ABI fixed grid during late calendar year 2017. The duration

of this fixed grid test is expected to be approximately 5 weeks,

with a tentative test end date of Wednesday, October 11, 2017.

 

The SBN's GOES-R Series West channel (PID 107) will be used for

dissemination of the test data, even though the test data will

be from GOES-16, not GOES West.  For this test only, the WMO

headers for the GOES-16 fixed grid imagery will be as follows,

with references to the 11 character template:

 

Template: T1 T2 A1 A2 ii CCCC

 

  T1 = T

  T2 = I

  A1 = T for large-scale (non-mesoscale) sectors

     = U for mesoscale sectors

  A2   Where A1=T, for large-scale (non-mesoscale) sectors,

       A2 corresponds to geographical sectors as follows:

     = E for the East CONUS sector

     = P for the Puerto Rico Regional sector

     = S for the East Full Disk

       Where A1=U, for mesoscale sectors, A2 values corresponds

       to geographical latitude/longitude areas as follows:

     = A for 45 deg. N <= Lat. < 60 deg. N and

             120 deg. W < Long. <= 135 deg W

     = B for 45 deg. N <= Lat. < 60 deg. N and

             105 deg. W < Long. <= 120 deg. W

     = C for 45 deg. N <= Lat. < 60 deg. N and

             90 deg. W < Long. <= 105 deg. W

     = D for 45 deg. N <= Lat. < 60 deg. N and

             75 deg. W < Long. <=  90 deg. W

     = E for 45 deg. N <= Lat. < 60 deg. N and

             60 deg. W < Long. <=  75 deg. W

     = F for 30 deg. N <= Lat. < 45 deg. N and

             120 deg. W < Long. <= 135 deg. W

     = G for 30 deg. N <= Lat. < 45 deg. N and

             105 deg. W < Long. <= 120 deg. W

     = H for 30 deg. N <= Lat. < 45 deg. N and

             90 deg. W < Long. <= 105 deg. W

     = I for 30 deg. N <= Lat. < 45 deg. N and

             75 deg. W < Long. <=  90 deg. W

     = J for 30 deg. N <= Lat. < 45 deg. N and

             60 deg. W < Long. <=  75 deg. W

     = K for 15 deg. N <= Lat. < 30 deg. N and

             120 deg. W < Long. <= 135 deg. W

     = L for 15 deg. N <= Lat. < 30 deg. N and

             105 deg. W < Long. <= 120 deg. W

     = M for 15 deg. N <= Lat. < 30 deg. N and

             90 deg. W < Long. <= 105 deg. W

     = N for 15 deg. N <= Lat. < 30 deg. N and

             75 deg. W < Long. <=  90 deg. W

     = O for 15 deg. N <= Lat. < 30 deg. N and

             60 deg. W < Long. <=  75 deg. W

     = P for 0 deg. N <= Lat. < 15 deg. N and

             90 deg. W < Long. <= 135 deg. W

     = Q for 0 deg. N <= Lat. < 15 deg. N and

             60 deg. W < Long. <=  90 deg. W

     = R for 45 deg. N <= Lat. < 90 deg. N and

             135 deg. W < Long. <= 180 deg. W

     = S for 0 deg. N <= Lat. < 45 deg. N and

             135 deg. W < Long. <= 180 deg. W

     = T for 60 deg. N <= Lat. < 90 deg. N and

             90 deg. E < Long. <= 135 deg. W

     = U for 0 deg. N <= Lat. < 60 deg. N and

             90 deg. E < Long. <=  60 deg. W

     = V for 0 deg. N <= Lat. < 90 deg. N and

             180 deg. W < Long. <=  90 deg. E

     = W and X are reserved for future use

     = Y for 90 deg. S <= Lat. <  0 deg. S and

             105 deg. W < Long. <=  90 deg. E

     = Z for 90 deg. S <= Lat. <  0 deg. S and

             90 deg. E < Long. <= 105 deg. W

 

Where mesoscale boxes T, U and Z extend across the prime

meridian (0 deg. longitude) and boxes V and Y extend across the

International Dateline (180 deg. longitude).  Sector boundaries

of 0 deg. N or 0 deg. S refer to the equator.  The "<=" symbols

refer to "less than or equal to."  Note that some of the regions

above are out of range from GOES-16 at its current location, but

these regions could be within range after the satellite’s

station changes.

 

  ii = ABI channel number (01 - 16); between the ii and CCCC is

       a space

 

  CCCC = KNES (signifies products originated by NESDIS)

 

These unique WMO Headers and the unique SBN-channel assignments

will be used to differentiate this test’s fixed grid GOES-16

SCMI from the SBN’s pre-existing GOES-16 SCMI (the latter of

which is described in Service Change Notice 17-24, whose link

appears earlier in this notice).  Two additional features within

the test SCMI files will distinguish this test’s fixed grid

SCMI.  The first feature will be the value of the global

metadata satellite_id parameter, whose value will be “GOES-17”

(even though this test’s sensor data will be from GOES-16).  The

second feature will be the values of the global metadata

product_name parameter, whose values will begin with “G17_”

(e.g., G17_TCONUS and so on).

 

During this test and evaluation period, the set of available

fixed-grid sectors will change. For example, there will be no

mesoscale sectors if and when the GOES-16 ABI scans in mode 4 

(a full disk mode).

 

Approximate hourly product counts and volumes for the GOES-16

fixed grid test stream are as follows:

 

 ABI Sector           Hourly Count    Hourly Volume

 ----------           ------------    -------------

 East CONUS             192/hour      2592MBytes/hour

 Puerto Rico             64/hour       192MBytes/hour

 East Full Disk          64/hour       256Mbytes/hour

 Mesoscale             1920/hour      1322Mbytes/hour

 

Product counts and volumes will vary due to ABI mode changes,

diurnal variations, file-compression variability, tiling and

other factors.

 

The file format for these products is netCDF4.

 

For information about the ABI Fixed Grid, please refer to the

GOES-R Product Definition and Users’ Guide:

 

http://www.goes-r.gov/users/docs/PUG-L1b-vol3.pdf

 

Additional information about the flow of GOES-16 products on the

SBN has been posted at the following website and will be

periodically updated:

 

http://www.nws.noaa.gov/noaaport/html/GOES_R.shtml

 

Critical weather or other factors could delay the activation of

these products on the SBN. 

 

For questions pertaining to this change or upcoming plans for

the addition of GOES-16 products onto NOAAPORT, please contact:

 

     Brian Gockel

     NOAA/NWS Office of Observations

     Surface and Upper Air Division, Services Branch

     Silver Spring, MD 20910

     Email: Brian.Gockel@noaa.gov

  and

     AWIPS Network Control Facility (NCF) Help Desk

     NOAA/NWS Office of Central Processing

     Silver Spring, MD 20910

     Email: nws.ncf.supervisors@noaa.gov

 

For questions regarding the scientific or technical content of

the NOAAPORT-disseminated GOES-16 products please contact:

 

     Environmental Satellite Processing Center (ESPC) Help Desk

     Suitland, Maryland 20746

     Phone: 301-817-3880

     Email: ESPCOperations@noaa.gov

 

National Service Change Notices are online at:

 

http://www.weather.gov/os/notif.htm

 

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