>From: "Hoeth, Brian" <address@hidden>
>Organization: JSFC
>Keywords: 200101172009.f0HK9le29791 McIDAS ADDE NEXRADIR NEXRAGE
Brian,
>Just wanted to update you ...
OK, I appreciate it.
>I have ftp'd some radar data (the low level layer composite reflectivity
>max) from the NWS anonymous FTP server and after setting up the dataset name
>for it, I was able to list the data with no problems.
Sounds good so far.
>I also set up an
>"alias" to display it and it DOES display.
Sounding better and better.
>There seems to be a scaling
>difference between this data and the NOAAPort data though because in order
>for me to get the data to look "reasonable", I had to put a MAG=4 for the
>IMGDISP.
The layer reflectivity products are quite a bit smaller than the base
reflectivity products. For example, the base reflectivity at tilt 1
product is 460x460:
IMGLIST RTNEXRAD/N0R ID=FTG FORM=EXP
Image file directory listing for:RTNEXRAD/N0R
Pos Satellite/ Date Time Center Res (km) Image_Size
sensor Lat Lon Lat Lon
--- ------------- ------------ -------- ---- ---- ----- ----- ------------
119 RADAR 1 FEB 01032 02:49:00 FTG
Band: 1 Base Reflectivity 1.0 1.0 460 x 460
proj: 1234 created: 2001032 24937 memo: Base Reflct 0.50 DEG Clear Air
type:NEXR cal type:RAW
offsets: data= 1024 navigation= 256 calibration= 768 auxillary= 768
doc length: 0 cal length: 0 lev length: 0 PREFIX= 0
valcod: 0 zcor: 0 avg-smp: N
start yyddd: 2001032 start time: 24930 start scan: 0
lcor: 1 ecor: 1 bytes per pixel: 1 ss: 7
IMGLIST: done
while the layer reflectivity product at tilt 1 is 116x116:
IMGLIST ......./..... ID=FTG FORM=EXP
Image file directory listing for:WNEXRAD/LREF1
Pos Satellite/ Date Time Center Res (km) Image_Size
sensor Lat Lon Lat Lon
--- ------------- ------------ -------- ---- ---- ----- ----- ------------
17 RADAR 1 FEB 01032 02:39:00 FTG
Band: 3 Layer Reflectivity 1.0 1.0 116 x 116
proj: 1234 created: 2001032 23944 memo: Layer Reflct 11 - 24 Clear Air
type:NEXR cal type:RAW
offsets: data= 1024 navigation= 256 calibration= 768 auxillary= 768
doc length: 0 cal length: 0 lev length: 0 PREFIX= 0
valcod: 0 zcor: 0 avg-smp: N
start yyddd: 2001032 start time: 23937 start scan: 0
lcor: 1 ecor: 1 bytes per pixel: 1 ss: 7
IMGLIST: done
(I commented out the dataset name since I a listing values from a WSI
transmitted layer reflectivity at tilt 1 product, and our contract with
WSI prohibits access by folks outside of UCAR.)
So, your having to blow-up the lref1 product by a factor of 4 matches
the difference in size of these products.
>Other than that though, the data looks good !!!
Seems to me that it all looks nominal (to use an old NASA phrase) ;-)
>Thanks again for getting me the "nexrupdate".
Actually, I messed up that tar file. You really should grab the latest
updates to the code and install them:
<login as 'mcidas'>
cd ~/mcidas7.704
ftp ftp.unidata.ucar.edu
<user> anonymous
<pass> your_email_address
cd pub/mcidas
binary
get nexrad.tar.Z
quit
zcat nexrad.tar.Z | tar xvf -
cd src
make nexradir nexraget
<verify that the newly built versions of nexradir and nexraget are
linked to the ~mcidas/bin directory>
The modifications are basically what I told you about last time (but
the last tar file did not include nexradir.cp or nexraget.cp) with
a few minor updates.
Cheers.
Tom
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