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20030206: NEXRAD calibration information for raw values of zero (cont.)



>From:  Rick Kohrs <address@hidden>
>Organization:  SSEC
>Keywords:  200302061458.h16EwY624125 McIDAS nexradir nexraget

Rick,

After I sent you my note yesterday evening, I got concerned that you
may have been talking about probes of a NEXRAD image that had been
turned into an AREA, loaded, and then probed.  After reading Inquiry
11731, however, I am not sure what to think.  Since the inquiry does not
specify if the image being probed is part of a NEXR or AREA dataset,
I will assume that it is part of a NEXR one.  This will limit my comments
to the NEXRAD Level III server code that I wrote.

This morning, I worked my through all of the NEXRAD product types to
see if I could find a situation where the units for the probed values
are not listed.  My results are listed below.

For reference, I name the elements of my NEXRAD Level III dataset using
the types specified by the National Weather Service:

N0R - Base Reflectivity Tilt 1
N1R - Base Reflectivity Tilt 2
N2R - Base Reflectivity Tilt 3
N3R - Base Reflectivity Tilt 4
N0Z - 248 nm Base Reflectifity
NCR - Composite Reflectivity
N0V - Radial Velocity Tilt 1
N1V - Radial Velocity Tilt 2
N0S - Storm-Rel Mean Vel Tilt 1
N1S - Storm-Rel Mean Vel Tilt 2
N2S - Storm-Rel Mean Vel Tilt 3
N3S - Storm-Rel Mean Vel Tilt 4
N1P - 1-hour Surface Rainfall
NTP - Storm Total Rainfall
NET - Echo Tops
NVL - Vertical Liquid H2O

My tests all follow the same sequence:

1) load the most recent image of the particular type of image from the
   Unidata ADDE server at the ATM offices of NSF:

   DATALOC ADD RTNEXRAD atm.geo.nsf.gov

2) probe the image using 'D' at a point within the area covered by the product
   but not containing any data.

Here are the results:

 1) N0R == BREF1

IMGDISP RTNEXRAD/N0R ID=FTG LINELE= 230 230 PLACE=C MAG= 1 1 EU=BREF SU=X 
ALL=11 SF=YES REFRESH='EG GRA=(GRA);MAP FILE=OUTLUSAM MCOL=1 WID=1 
GRA=(GRA);BAR (GRA) SU=X X COL=7 ORIENT=VER;TE ?LASTFRM (GRA)'

N0Z == 248 nm Base Reflectifity
 
IMGDISP RTNEXRAD/N0Z ID=FTG LINELE= 230 230 PLACE=C MAG= 1 1 EU=BREF SU=X 
ALL=11 SF=YES REFRESH='EG GRA=(GRA);MAP FILE=OUTLUSAM MCOL=1 WID=1 
GRA=(GRA);BAR (GRA) SU=X X COL=7 ORIENT=VER;TE ?LASTFRM (GRA)'

     Image Name       ID       Day      Nominal Time   Scan Time    Band
  ----------------    ---    -------    ------------   ---------    ----
  RTNEXRAD/N0Z        FTG  7 Feb 03038   18:13:00      MISSING       1

                        File     Nominal  Image     RAW     BRIT    ECHO    VIP
       Lat/Lon      Line/Element  Line/Element                      DBZ
 40:16:16 / 104:49:39  202/  217     203/  218         0         0  -9997      0

IMGPROBE: Done

 2) N1R == BREF2

IMGDISP RTNEXRAD/N1R ID=FTG LINELE= 230 230 PLACE=C MAG= 1 1 EU=BREF SU=X 
ALL=11 SF=YES REFRESH='EG GRA=(GRA);MAP FILE=OUTLUSAM MCOL=1 WID=1 
GRA=(GRA);BAR (GRA) SU=X X COL=7 ORIENT=VER;TE ?LASTFRM (GRA)'

     Image Name       ID       Day      Nominal Time   Scan Time    Band
  ----------------    ---    -------    ------------   ---------    ----
  RTNEXRAD/N1R        FTG  7 Feb 03038   18:23:00      MISSING       1

                        File     Nominal  Image     RAW     BRIT    ECHO    VIP
       Lat/Lon      Line/Element  Line/Element                      DBZ
 40:18:26 / 104:38:21  171/  221     172/  222         0         0  -9997      0

IMGPROBE: Done

 3) N2R == BREF3

IMGDISP RTNEXRAD/N2R ID=FTG LINELE= 230 230 PLACE=C MAG= 1 1 EU=BREF SU=X 
ALL=11 SF=YES REFRESH='EG GRA=(GRA);MAP FILE=OUTLUSAM MCOL=1 WID=1 
GRA=(GRA);BAR (GRA) SU=X X COL=7 ORIENT=VER;TE ?LASTFRM (GRA)'

     Image Name       ID       Day      Nominal Time   Scan Time    Band
  ----------------    ---    -------    ------------   ---------    ----
  RTNEXRAD/N2R        FTG  7 Feb 03038   18:23:00      MISSING       1

                        File     Nominal  Image     RAW     BRIT    ECHO    VIP
       Lat/Lon      Line/Element  Line/Element                      DBZ
 40:26:31 / 104:43:19  156/  214     157/  215         0         0  -9997      0

IMGPROBE: Done

 4) N3R == BREF4

IMGDISP RTNEXRAD/N3R ID=FTG LINELE= 230 230 PLACE=C MAG= 1 1 EU=BREF SU=X 
ALL=11 SF=YES REFRESH='EG GRA=(GRA);MAP FILE=OUTLUSAM MCOL=1 WID=1 
GRA=(GRA);BAR (GRA) SU=X X COL=7 ORIENT=VER;TE ?LASTFRM (GRA)'

     Image Name       ID       Day      Nominal Time   Scan Time    Band
  ----------------    ---    -------    ------------   ---------    ----
  RTNEXRAD/N3R        FTG  7 Feb 03038   18:23:00      MISSING       1

                        File     Nominal  Image     RAW     BRIT    ECHO    VIP
       Lat/Lon      Line/Element  Line/Element                      DBZ
 40:24:21 / 104:46:09  160/  210     161/  211         0         0  -9997      0

IMGPROBE: Done

 5) N0Z == BREF248

IMGDISP RTNEXRAD/N0Z ID=FTG LINELE= 230 230 PLACE=C MAG= 1 1 EU=BREF SU=X 
ALL=11 SF=YES REFRESH='EG GRA=(GRA);MAP FILE=OUTLUSAM MCOL=1 WID=1 
GRA=(GRA);BAR (GRA) SU=X X COL=7 ORIENT=VER;TE ?LASTFRM (GRA)'

     Image Name       ID       Day      Nominal Time   Scan Time    Band
  ----------------    ---    -------    ------------   ---------    ----
  RTNEXRAD/N0Z        FTG  7 Feb 03038   18:33:00      MISSING       1

                        File     Nominal  Image     RAW     BRIT    ECHO    VIP
       Lat/Lon      Line/Element  Line/Element                      DBZ
 40:16:16 / 104:59:33  202/  210     203/  211         0         0  -9997      0

IMGPROBE: Done

 6) NCR == CREF

IMGDISP RTNEXRAD/NCR ID=FTG LINELE= 232 232 PLACE=C MAG= 2 2 EU=CREF SU=X 
ALL=11 SF=YES REFRESH='EG GRA=(GRA);MAP FILE=OUTLCNTY OUTLUSAM MCOL=8 1 WID=2 1 
GRA=(GRA);BAR (GRA) SU=X X COL=7 ORIENT=VER;TE ?LASTFRM (GRA)'

     Image Name       ID       Day      Nominal Time   Scan Time    Band
  ----------------    ---    -------    ------------   ---------    ----
  RTNEXRAD/NCR        FTG  7 Feb 03038   18:23:00      MISSING       2

                        File     Nominal  Image     RAW     BRIT    ECHO    VIP
       Lat/Lon      Line/Element  Line/Element                      DBZ
 40:27:35 / 104:38:22  156/  223     157/  224         0         0  -9997      0

IMGPROBE: Done

 7) N0V == BVEL1

IMGDISP RTNEXRAD/N0V ID=FTG LINELE= 230 230 PLACE=C MAG= 1 1 EU=RVEL SU=X 
ALL=11 SF=YES REFRESH='EG GRA=(GRA);MAP FILE=OUTLUSAM MCOL=1 WID=1 
GRA=(GRA);BAR (GRA) SU=X X COL=7 ORIENT=VER;TE ?LASTFRM (GRA)'

     Image Name       ID       Day      Nominal Time   Scan Time    Band
  ----------------    ---    -------    ------------   ---------    ----
  RTNEXRAD/N0V        FTG  7 Feb 03038   18:33:00      MISSING       9

                        File     Nominal  Image     RAW     BRIT    VEL
       Lat/Lon      Line/Element  Line/Element
 40:09:48 / 105:00:12  187/  190     188/  191         0         0  -9997

IMGPROBE: Done

 8) N1V == BVEL2

IMGDISP RTNEXRAD/N1V ID=FTG LINELE= 230 230 PLACE=C MAG= 1 1 EU=RVEL SU=X 
ALL=11 SF=YES REFRESH='EG GRA=(GRA);MAP FILE=OUTLUSAM MCOL=1 WID=1 
GRA=(GRA);BAR (GRA) SU=X X COL=7 ORIENT=VER;TE ?LASTFRM (GRA)'

     Image Name       ID       Day      Nominal Time   Scan Time    Band
  ----------------    ---    -------    ------------   ---------    ----
  RTNEXRAD/N1V        FTG  7 Feb 03038   18:33:00      MISSING       9

                        File     Nominal  Image     RAW     BRIT    VEL
       Lat/Lon      Line/Element  Line/Element
 40:10:53 / 104:38:21  185/  221     186/  222         0         0  -9997

IMGPROBE: Done

 9) N0S == SRVEL1

IMGDISP RTNEXRAD/N0S ID=FTG LINELE= 230 230 PLACE=C MAG= 1 1 EU=RVEL SU=X 
ALL=11 SF=YES REFRESH='EG GRA=(GRA);MAP FILE=OUTLUSAM MCOL=1 WID=1 
GRA=(GRA);BAR (GRA) SU=X X COL=7 ORIENT=VER;TE ?LASTFRM (GRA)'

     Image Name       ID       Day      Nominal Time   Scan Time    Band
  ----------------    ---    -------    ------------   ---------    ----
  RTNEXRAD/N0S        FTG  7 Feb 03038   18:43:00      MISSING      10

                        File     Nominal  Image     RAW     BRIT
       Lat/Lon      Line/Element  Line/Element
 40:04:25 / 104:53:08  197/  200     198/  201         0         0

IMGPROBE: Done

10) N1S == SRVEL2

IMGDISP RTNEXRAD/N1S ID=FTG LINELE= 230 230 PLACE=C MAG= 1 1 EU=RVEL SU=X 
ALL=11 SF=YES REFRESH='EG GRA=(GRA);MAP FILE=OUTLUSAM MCOL=1 WID=1 
GRA=(GRA);BAR (GRA) SU=X X COL=7 ORIENT=VER;TE ?LASTFRM (GRA)'

     Image Name       ID       Day      Nominal Time   Scan Time    Band
  ----------------    ---    -------    ------------   ---------    ----
  RTNEXRAD/N1S        FTG  7 Feb 03038   18:33:00      MISSING      10

                        File     Nominal  Image     RAW     BRIT
       Lat/Lon      Line/Element  Line/Element
 40:08:11 / 104:33:24  190/  228     191/  229         0         0

IMGPROBE: Done

11) N2S == SRVEL3

IMGDISP RTNEXRAD/N2S ID=TLH LINELE= 230 230 PLACE=C MAG= 1 1 EU=RVEL SU=X 
ALL=11 SF=YES REFRESH='EG GRA=(GRA);MAP FILE=OUTLUSAM MCOL=1 WID=1 
GRA=(GRA);BAR (GRA) SU=X X COL=7 ORIENT=VER;TE ?LASTFRM (GRA)'

     Image Name       ID       Day      Nominal Time   Scan Time    Band
  ----------------    ---    -------    ------------   ---------    ----
  RTNEXRAD/N2S        TLH  7 Feb 03038   18:43:00      MISSING      10

                        File     Nominal  Image     RAW     BRIT
       Lat/Lon      Line/Element  Line/Element
 30:36:17 / 84:11:36   206/  242     207/  243         0         0

IMGPROBE: Done

12) N3S == SRVEL4

IMGDISP RTNEXRAD/N3S ID=LBB LINELE= 230 230 PLACE=C MAG= 1 1 EU=RVEL SU=X 
ALL=11 SF=YES REFRESH='EG GRA=(GRA);MAP FILE=OUTLUSAM MCOL=1 WID=1 
GRA=(GRA);BAR (GRA) SU=X X COL=7 ORIENT=VER;TE ?LASTFRM (GRA)'

     Image Name       ID       Day      Nominal Time   Scan Time    Band
  ----------------    ---    -------    ------------   ---------    ----
  RTNEXRAD/N3S        LBB  7 Feb 03038   18:44:00      MISSING      10

                        File     Nominal  Image     RAW     BRIT
       Lat/Lon      Line/Element  Line/Element
 33:25:46 / 102:04:59  254/  204     255/  205         0         0

IMGPROBE: Done

13) N1P == PRECIP1

IMGDISP RTNEXRAD/N1P ID=LBB LINELE= 160 161 PLACE=C MAG= 2 2 EU=PRE1 SU=X 
ALL=11 SF=YES REFRESH='EG GRA=(GRA);MAP FILE=OUTLCNTY OUTLUSAM MCOL=8 1 WID=2 1 
GRA=(GRA);BAR (GRA) SU=X X COL=7 ORIENT=VER;TE ?LASTFRM (GRA)'

     Image Name       ID       Day      Nominal Time   Scan Time    Band
  ----------------    ---    -------    ------------   ---------    ----
  RTNEXRAD/N1P        LBB  7 Feb 03038   18:44:00      MISSING       5

                        File     Nominal  Image     RAW     BRIT    RAIN
       Lat/Lon      Line/Element  Line/Element                      IN
 34:35:17 / 103:06:05   62/   56      63/   57         0         09997.00

IMGPROBE: Done

14) NTP == PRECIPTOT

IMGDISP RTNEXRAD/NTP ID=LBB LINELE= 160 161 PLACE=C MAG= 2 2 EU=PRET SU=X 
ALL=11 SF=YES REFRESH='EG GRA=(GRA);MAP FILE=OUTLCNTY OUTLUSAM MCOL=8 1 WID=2 1 
GRA=(GRA);BAR (GRA) SU=X X COL=7 ORIENT=VER;TE ?LASTFRM (GRA)'

     Image Name       ID       Day      Nominal Time   Scan Time    Band
  ----------------    ---    -------    ------------   ---------    ----
  RTNEXRAD/NTP        LBB  7 Feb 03038   18:44:00      MISSING       7

                        File     Nominal  Image     RAW     BRIT    RAIN
       Lat/Lon      Line/Element  Line/Element                      IN
 34:13:44 / 102:55:19   82/   64      83/   65         0         09997.00

IMGPROBE: Done

15) NET == TOPS

IMGDISP RTNEXRAD/NET ID=LBB LINELE= 58 58 PLACE=C MAG= 3 3 EU=TOPS SU=X ALL=11 
SF=YES REFRESH='EG GRA=(GRA);MAP FILE=OUTLCNTY OUTLUSAM MCOL=8 1 WID=2 1 
GRA=(GRA);BAR (GRA) SU=X X COL=7 ORIENT=VER;TE ?LASTFRM (GRA)'

     Image Name       ID       Day      Nominal Time   Scan Time    Band
  ----------------    ---    -------    ------------   ---------    ----
  RTNEXRAD/NET        LBB  7 Feb 03038   18:44:00      MISSING       4

                        File     Nominal  Image     RAW     BRIT    TOPS
       Lat/Lon      Line/Element  Line/Element                      K FT
 33:58:38 / 102:20:02   48/   45      49/   46         0         0    243

IMGPROBE: Done

16) NVL == VIL

IMGDISP RTNEXRAD/NVL ID=LBB LINELE= 58 58 PLACE=C MAG= 3 3 EU=VIL SU=X ALL=11 
SF=YES REFRESH='EG GRA=(GRA);MAP FILE=OUTLCNTY OUTLUSAM MCOL=8 1 WID=2 1 
GRA=(GRA);BAR (GRA) SU=X X COL=7 ORIENT=VER;TE ?LASTFRM (GRA)'

     Image Name       ID       Day      Nominal Time   Scan Time    Band
  ----------------    ---    -------    ------------   ---------    ----
  RTNEXRAD/NVL        LBB  7 Feb 03038   18:44:00      MISSING       8

                        File     Nominal  Image     RAW     BRIT    H2O
       Lat/Lon      Line/Element  Line/Element
 34:15:53 / 102:33:11   40/   40      41/   41         0         0    243

IMGPROBE: Done


The listings that look incorrect to me are the ones for N0S-N3S (SRVEL1-4),
NVL (VIL) and NET (TOPS).  I will look into these.

All of the other lists look correct.

>>--------------080504070803020809030006
>>Content-Type: text/plain;
>> name="Nexrad.out"
>>Content-Transfer-Encoding: 7bit
>>Content-Disposition: inline;
>> filename="Nexrad.out"
>>
>>  NEXRAD/TOPS
>>       Lat/Lon      Line/Element  Line/Element                      K FT
>> 29:13:14 / 95:46:44    64/   40      65/   41         0         0    243
>>
>>  NEXRAD/SRVEL4 
>>       Lat/Lon      Line/Element  Line/Element
>> 29:25:37 / 95:13:24   234/  215     235/  216         0         0  -9997
>>
>>  NEXRAD/SRVEL3   
>>       Lat/Lon      Line/Element  Line/Element
>> 29:24:33 / 95:12:09   236/  217     237/  218         0         0  -9997
>>
>>  NEXRAD/SRVEL2  
>>       Lat/Lon      Line/Element  Line/Element
>> 29:22:23 / 95:10:18   240/  220     241/  221         0         0  -9997
>>
>>  NEXRAD/SRVEL1 
>>       Lat/Lon      Line/Element  Line/Element
>> 29:28:19 / 95:05:21   229/  228     230/  229         0         0  -9997
>>
>>  NEXRAD/PRECIPTOT
>>       Lat/Lon      Line/Element  Line/Element                      IN
>> 29:28:19 / 95:05:58   114/  114     115/  115         0         09997.00
>>
>>  NEXRAD/PRECIP1 
>>       Lat/Lon      Line/Element  Line/Element                      IN
>> 29:28:19 / 95:05:58   114/  114     115/  115         0         09997.00
>>
>>  NEXRAD/CREF   
>>       Lat/Lon      Line/Element  Line/Element                      DBZ
>> 29:24:00 / 95:22:03   239/  203     240/  204         0         0  -9997    
>  
>>  0
>>
>>  NEXRAD/BVEL2 
>>       Lat/Lon      Line/Element  Line/Element
>> 29:24:00 / 95:22:03   237/  201     238/  202         0         0  -9997
>>
>>  NEXRAD/BVEL1
>>       Lat/Lon      Line/Element  Line/Element
>> 29:24:00 / 95:22:03   237/  201     238/  202         0         0  -9997
>>
>>  NEXRAD/BREF4  
>>       Lat/Lon      Line/Element  Line/Element                      DBZ
>> 29:24:00 / 95:22:03   237/  201     238/  202         0         0  -9997    
>  
>>  0
>>
>>  NEXRAD/BREF3 
>>       Lat/Lon      Line/Element  Line/Element                      DBZ
>> 29:24:00 / 95:22:03   237/  201     238/  202         0         0  -9997    
>  
>>  0
>>
>>  NEXRAD/BREF2
>>       Lat/Lon      Line/Element  Line/Element                      DBZ
>> 29:24:00 / 95:22:03   237/  201     238/  202         0         0  -9997    
>  
>>  0
>>
>>  NEXRAD/BREF1 
>>       Lat/Lon      Line/Element  Line/Element                      DBZ
>> 29:24:00 / 95:22:03   237/  201     238/  202         0         0  -9997    
>  
>>  0
>>
>>  NEXRAD/BREF248 
>>       Lat/Lon      Line/Element  Line/Element                      DBZ
>> 29:19:42 / 95:39:21   237/  201     238/  202         0         0  -9997    
>  
>>  0
>>
>>  NEXRAD/VIL    
>>       Lat/Lon      Line/Element  Line/Element
>> 29:00:17 / 96:03:54    70/   33      71/   34         0         0    243
>>
>>--------------080504070803020809030006--

Tom