Digital Hybrid Scan Radial Product Decoder

The decoder GET_DHR_DATA returns information on the radar site, volume scan time, radar operating mode, and on the radar data itself. The array IFIELD() contains values 0-255, which can be converted to physical units (dBZ) by using the relationship:

dBZ = ((IFIELD-2)/2) - 32

An IFIELD value of 255 indicates 'missing' data beyond 120 nautical miles from the radar site.

Note that all input and output variables are INTEGER*4 except:

     IVAL() : BYTE or CHARACTER*1;
     IFIELD(,) : INTEGER*2

EXPLANATION OF CALLING SEQUENCE:

     CALL GET_DHR_DATA(IVAL,MSGLEN,ISITE,
     1  ISITE_LAT,ISITE_LON,ISITE_ELEV, 
     2  IYR,IMONTH,IDAY,
     3  IHR,IMINIT,IPROD,MAXVAL,IVCP,IFIELD,MAXRADIALS,MAXBINS,
     4  IAZMUTH,NBINS,NRADIALS,ICODE)

IVAL( )        =    BYTE OR CHARACTER*1 VECTOR OF LENGTH MSGLEN,
                    HOLDING THE DIGITAL HYBRID SCAN MESSAGE (INPUT)
MSGLEN         =    LENGTH OF THE MESSAGE (SHOULD BE 85100) (INPUT)
ISITE          =    WSR-88D SITE ID (OUTPUT)
ISITE_LAT      =    SITE LATITUDE  (DEG E), DEG X 1000 (OUTPUT)
ISITE_LAT      =    SITE LONGITUDE (DEG N), DEG X 1000 (OUTPUT)
ISITE_ELEV     =    SITE ELEVATION, M MSL (OUTPUT)
IYR,IMONTH,IDAY=    PRODUCT DATE (OUTPUT)
IHR,IMINIT     =    PRODUCT TIME, UTC (OUTPUT)
IPROD          =    PRODUCT CODE NUMBER (OUTPUT)
MAXVAL         =    MAXIMUM DIGITAL VALUE IN PRODUCT (OUTPUT)
IVCP           =    OPERATING VOLUME COVERAGE PATTERN (OUTPUT)
IFIELD(,)      =    RETURNED VALUES (DATA LEVELS) FOR THE   FIELD
                    (OUTPUT); AN INTEGER*2 ARRAY DIMENSIONED
                    MAXBINS,MAXRADIALS IN CALLING ROUTINE

                    RAW DIGITAL VALUES OF IFIELD 0-255,ARE CONVERTED
                    TO DBZ BY THE RELATIONSHIP:

                    DBZ = ((IFIELD-2)/2) - 32

MAXRADIALS     =    DIMENSION FOR IFIELD(), IAZMUTH(), INDICATING
                    MAXIMUM NUMBER OF RADIALS SHOULD BE SET .GE.
                    370 (INPUT)
MAXBINS        =    DIMENSION FOR IFIELD(), INDICATING MAXIMUM
                    NUMBER OF RANGE BINS.  SHOULD BE SET .GE. 230 (INPUT)
IAZMUTH()      =    ANTENNA AZIMUTH DIRECTIONS (DEG X 10) FOR EACH
                    RADIAL (OUTPUT, INTEGER*2).  DIMENSIONED BY
                    MAXRADIALS IN CALLING ROUTINE.
NBINS,NRADIALS =    NUMBER OF RANGE BINS AND RADIALS IN THE PRODUCT(OUTPUT)
ICODE          =    OUTPUT RETURN CODE, CONDITIONS AS FOLLOWS:
                    0 : MESSAGE DECODED OK  
                    2 : NOT A DHR (ID CODE 32) PRODUCT
                    3 : MAXRADIALS OR MAXBINS IS TOO SMALL
                    4 : PRODUCT LENGTH IS GREATER THAN MSGLEN

Known Deficiencies:

None

Related Documents:

Federal Meteorological Handbook 11: Doppler Radar Meteorological Observations Part C, WSR-88D Products and Algorithms.

Interface Control Document for Product Specification (Document Number 2620003A, WSR-88D OSF, June 26, 1998)

Interface Control Document for the RPG Associated PUP ( Document Number 2620001A, WSR-88D OSF, June 26, 1998)

WSR-88D Raster Product Decoder

Change History Log:

Download the Software:

The latest version of the WSR-88D Digital Hybrid Scan Radial product decoder can be downloaded and utilized free of charge, subject to the usual  NWS disclaimer, click  here to download a copy.