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20030206: NEXRAD calibration information for raw values of zero (cont.)
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- Subject: 20030206: NEXRAD calibration information for raw values of zero (cont.)
- Date: Fri, 07 Feb 2003 12:07:22 -0700
>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
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