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Re: 20070302: soliciting comments-Level II data stream and format



Hi David,

As indicated int he note, the data stream volume will increase significantly and require additional band width. I think that's an important point for users to keep in mind. Unidata will be addressing the changes, as they always do when changes are made to data streams and formats for applications.

I've copied Unidata support, in case there are other issues that need to be considered by users of the data.

Hope all is well with you!
Linda

David Knight wrote:
Hi Linda,
    What effect does this have on Unidata and affiliated users?
Is this some things we need to act on I.Y.O., or was it just an important
point of interest?
Cheers,
David

[Charset ISO-8859-1 unsupported, filtering to ASCII...]
Sorry if you receive duplicates of this message.  This is important 
information!!! Linda


PUBLIC INFORMATION STATEMENT...COMMENT REQUEST
NATIONAL WEATHER SERVICE HEADQUARTERS WASHINGTON DC
105 PM EST FRI MAR 2 2007

TO: FAMILY OF SERVICES /FOS/ SUBSCRIBERS...NOAA WEATHER WIRE SERVICE /NWWS/ SUBSCRIBERS...EMERGENCY MANAGERS WEATHER INFORMATION NETWORK /EMWIN/ SUBSCRIBERS... NOAAPORT SUBSCRIBERS...OTHER NATIONAL WEATHER SERVICE /NWS/ CUSTOMERS AND PARTNERS...NWS EMPLOYEES

FROM:    RICHARD J. VOGT
         DIRECTOR...WSR-88D RADAR OPERATIONS CENTER

SUBJECT: SOLICITING COMMENTS BY MARCH 30 2007 ON MODIFICATIONS TO WSR-88D LEVEL II DATA STREAM AND FORMAT: EFFECTIVE WITH WSR-88D BUILD 10 /JANUARY 2008 BETA TEST/

STARTING IMMEDIATELY AND CONTINUING THROUGH MARCH 30 2007...THE NWS IS SEEKING COMMENTS ON MODIFICATIONS TO WSR-88D LEVEL II DATA STREAM AND FORMAT...EFFECTIVE WITH WSR-88D BUILD 10 /JANUARY 2008 BETA TEST/.

BACKGROUND:

THE NWS...USAF AND FAA WSR-88D SYSTEMS PRODUCE LEVEL II DATA... THE HIGHEST RESOLUTION DIGITAL RADAR DATA AVAILABLE. THESE DATA CONTAIN REFLECTIVITY...RADIAL VELOCITY AND SPECTRUM WIDTH DATA FROM ALL RADAR SCANS. LEVEL II DATA ARE COLLECTED... DISTRIBUTED AND ARCHIVED IN REAL TIME FROM 133 WSR-88D SYSTEMS VIA THE NWS WSR-88D LEVEL II DATA COLLECTION AND DISTRIBUTION NETWORK.
PROPOSED CHANGES:

BEGINNING IN WSR-88D SOFTWARE BUILD 10 /BETA TEST AT APPROXIMATELY SIX SITES BEGINS IN JANUARY 2008 AND DEPLOYMENT TO ALL OPERATIONAL SITES BEGINS IN APRIL 2008/ THE DATA FORMAT AND CONTENT OF THE LEVEL II DATA STREAM WILL CHANGE.

1. THE FORMAT OF THE DATA WILL CHANGE FROM MSG1 TO MSG31. THIS FORMAT CHANGE IS REQUIRED TO HANDLE THE PLANNED ADDITIONS TO THE WSR-88D LEVEL II DATA STREAM - SUPER RESOLUTION DATA... BUILD 10... AND DUAL POLARIZATION DATA... BUILD 11. THE LOCAL DATA MANAGER METHOD OF DISTRIBUTING LEVEL II DATA VIA THE NWS WSR-88D LEVEL II DATA COLLECTION AND DISTRIBUTION NETWORK WILL NOT CHANGE.

2. THE DATA STREAM WILL INCREASE IN SIZE DUE TO THE PLANNED CHANGE TO SUPER RESOLUTION RADAR DATA IN BUILD 10. SUPER RESOLUTION DATA INCREASE THE AZIMUTH RESOLUTION FROM 1 DEGREE TO 0.5 DEGREE... THE REFLECTIVITY DATA RANGE RESOLUTION FROM 1 KM TO 0.25 KM... AND DOPPLER DATA RANGE FROM 230 KM TO 300 KM FOR SPLIT CUTS - GENERALLY SCANS AT 1.5 DEGREES OR LOWER ELEVATION. THE AMOUNT OF DATA COLLECTED AND TRANSMITTED DURING A VOLUME SCAN WILL INCREASE BY A FACTOR OF APPROXIMATELY 2.3. IT IS POSSIBLE THAT NETWORK-WIDE TRANSMISSION OF SUPER RESOLUTION DATA WILL NOT BEGIN IMMEDIATELY AFTER BUILD 10 IS DEPLOYED. IN THIS CASE THE DATA WILL BE RECOMBINED BACK TO THE LEGACY DATA RESOLUTION. THE TIMING OF THE NETWORK-WIDE TRANSMISSION OF SUPER RESOLUTION DATA WILL BE CONTINGENT UPON THE AVAILABILITY OF FUNDS TO ACQUIRE THE REQUIRED COMMUNICATIONS BANDWIDTH INCREASE. THE FORMAT OF THE DATA WILL CHANGE TO MSG31 WITH THE DEPLOYMENT OF BUILD 10.

THE FOLLOWING TOOLS WILL BE MADE AVAILABLE TO LEVEL II USERS TO ASSIST THEIR TRANSITION TO THE NEW DATA FORMAT AND CONTENT. INFORMATION ON HOW TO ACCESS THE TOOLS AND OTHER RELATED INFORMATION WILL BE POSTED AND PERIODICALLY UPDATED ON THE LEVEL II WEBSITE AT /USE LOWER CASE LETTERS/:
     HTTP://WWW.ROC.NOAA.GOV/NWS_LEVEL_2

1. DRAFT INTERFACE CONTROL DOCUMENTS DESCRIBING THE NEW DATA FORMAT AND DATA STREAM WILL BE AVAILABLE BY 31 MARCH 2007. 2. SAMPLE ARCHIVE DATA SETS USING THE NEW FORMAT AND DATA STREAM WILL BE AVAILABLE BY 30 JUNE 2007.

3. SAMPLE REAL-TIME DATA STREAMS USING THE NEW FORMAT AND DATA STREAM WILL BE AVAILABLE BY 31 AUGUST 2007. 4. AN EARLY VERSION OF BUILD 10 SOFTWARE... EXECUTABLE AND SOURCE CODE... WILL BE AVAILABLE BY 31 AUGUST 2007 FROM THE NWS COMMON OPERATIONS AND DEVELOPMENT ENVIRONMENT...CODE WEBSITE /USE LOWER CASE LETTERS/:
     HTTP://WWW.WEATHER.GOV/CODE88D

THE SOFTWARE WILL CONTAIN CODE TO READ SUPER RESOLUTION DATA AND TO RECOMBINE THE SUPER RESOLUTION DATA INTO LEGACY RESOLUTION DATA. THE RPG ALGORITHMS AND 4-BIT BASE PRODUCTS WILL USE RECOMBINED DATA. WE ARE SOLICITING COMMENTS BY 30 MARCH 2007 ON THE PLANS TO CHANGE THE DATA FORMAT AND CONTENT ALONG WITH THE TOOLS TO BE MADE AVAILABLE. PLEASE SEND ANY COMMENTS ON THIS PLAN TO:

        TIM CRUM
        WSR-88D RADAR OPERATIONS CENTER
        1200 WESTHEIMER DRIVE
        NORMAN... OK 73069
        address@hidden
        
THIS NOTICE AND OTHER CURRENT NATIONAL PUBLIC INFORMATION STATEMENTS ARE AVAILABLE ONLINE AT /USE LOWER CASE LETTERS/:

        HTTP://WWW.NWS.NOAA.GOV/OM/NOTIF.HTM

THIS MESSAGE IS LISTED AT THE TOP OF THE PAGE . . . ABOVE THE SERVICE CHANGE NOTICE AND TECHNICAL IMPLEMENTION NOTICE BOX.

$$
NNNN

--
Linda Miller - address@hidden
Community Services, Unidata
University Corporation for Atmospheric Research
P.O. Box 3000
Boulder, CO 80307-3000
303-497-8646 fax: 303-497-8690

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--
Linda Miller - address@hidden
Community Services, Unidata
University Corporation for Atmospheric Research
P.O. Box 3000
Boulder, CO 80307-3000
303-497-8646 fax: 303-497-8690