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20010508: McIDAS display of NEXRAD NVL product

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  • Subject: 20010508: McIDAS display of NEXRAD NVL product
  • Date: Wed, 09 May 2001 02:36:45 -0600
>From: Gilbert Sebenste <address@hidden>
>Organization: NIU
>Keywords: 200105082129.f48LT9p20218 McIDAS ADDE NEXRAD NVL

Gilbert,

>When displaying VIL's using the IMGDISP command, it shows a 10 state area!
>
>IMGDISP RTNEXRAD/NVL ID=DDC STA=DDC EU=BREF REFRESH='EG; MAP VH; BAR'
>
>See what that does on your machine.

I get the same thing.

IMGLIST RTNEXRAD/NVL ID=DDC FORM=EXP
Image file directory listing for:RTNEXRAD/NVL
 Pos Satellite/         Date       Time      Center      Res (km)   Image_Size

     sensor                                 Lat  Lon    Lat   Lon
 --- -------------  ------------  --------  ---- ----  ----- ----- ------------
  39  RADAR          9 MAY 01129  03:45:00     DDC
    Band: 8  Vertical Liquid Water                       1.0   1.0   116 x  116
     proj: 1234 created: 2001129  35054  memo: Vert Int Lq H2O [mm] Precip Mode
     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: 2001129  start time: 34507  start scan:    0
     lcor:    1  ecor:     1  bytes per pixel: 1  ss:  7
     Image Center Point Res (derived)  Lat:   4.00 (km)  Lon:   4.00 (km)

IMGLIST: done

Notice that the size of the product is 116x116.  In order to make it the same
size as a "typical" display, one has to blow the image up:

IMGDISP RTNEXRAD/NVL ID=DDC STA=DDC MAG=3 EU=BREF REFRESH='EG; MAP VH; BAR'

A GIF (tm) rendering of this can be seen in:

http://www.unidata.ucar.edu/staff/tom/gifs/nvl.gif

(unfortunately, there is not much to see in the hour I used for display, but
you should get the idea.)

Tom

>From address@hidden Wed May  9 08:54:55 2001
>Subject: Re: 20010508: McIDAS display of NEXRAD NVL product

Hi Tom,

As always, thanks. MAG=3 will do it!

*******************************************************************************
Gilbert Sebenste                                                     ********
Internet: address@hidden    (My opinions only!)                     ******
Staff Meteorologist, Northern Illinois University                      ****
E-mail: address@hidden                                 ***
web: http://weather.admin.niu.edu                                      **
Work phone: 815-753-5492                                                *
*******************************************************************************