20040924: Problem with gpnexr2 plot

James,

The velocity couplet actually display quite differently as tilt angle is varied.
The 2230 file I have shows available velocity tilts as:

TILT=list
 2: elev 0.490581
 3: elev 0.489972
 4: elev 0.483398
 6: elev 1.494262
 7: elev 1.497549
 8: elev 1.498645
 9: elev 2.389282
10: elev 2.373047
11: elev 2.381081
12: elev 3.394079
13: elev 3.390137
14: elev 3.388658
15: elev 4.274471
16: elev 4.262695
17: elev 5.988945
18: elev 9.900442
19: elev 14.601773
20: elev 19.509041


When I use TILT=.483398 (eg the lowest), I get your plot.

When I use TILT=.489972, the green is just a small portion,
and when I go to .490581 the green is gone.

So, that seems to be the data that is realy in the file,
and seems to be consistent in that it doesn't just disappear 
from one tilt to the next, but there is some trending upward.

Have you investigated this through various levels at the times before
and after the 2230Z frame?

Steve Chiswell
Unidata User Support.






>From: James Murakami <address@hidden>
>Organization: UCAR/Unidata
>Keywords: 200409241716.i8OHGQnJ028523

>--Mumble_of_Moles_976_000
>Content-Type: TEXT/plain; charset=us-ascii
>Content-MD5: lgFXZDSWvuvcn8Zk9K4xuw==
>
>Hi. When I run gpnexr2 (version in GEMPAK5.7.2p2) to view
>a velocity plot, the image doesn't look quite right. That
>is, part of the image that should have positive speeds
>are negative (green color). Compare the velocity couplet
>in the LCH.gif (taken from level III data) versus the
>KLCH.gif (level II data). The left side of the couplet should 
>be in all "warm" colors. I know the magnitude scale is
>different for the two images, but orange is positive on both
>scales. Also, green is negative for both.
>
>The plots I've attached were run from the source version for
>Solaris. I got the same results when running on a (binary) linux
>version (plots not included).
>
>I also attached copies of the setting I used to plot in gpnexr2
>as well as the level II radar file (in case it turns out the 
>file is at fault).
>
>As always, thank you for your assistance.
>
>James
>
>----------------------------------------------
>James Murakami
>Staff Meteorologist/Student Affairs
>Department of Atmospheric and Oceanic Sciences
>University of California, Los Angeles
>405 Hilgard Ave.
>Los Angeles, CA  90095-1565
>
>
>   e-mail:  address@hidden
>telephone:  310-825-2418
>      Fax:  310-206-5219
>-----------------------------------------------
>
>--Mumble_of_Moles_976_000
>Content-Type: TEXT/plain; name="gpnexr2.nts"; charset=us-ascii; x-unix-mode=06
> 44
>Content-Description: gpnexr2.nts
>Content-MD5: R9/jSX918NZP+ySg+3QUdw==
>
>MAP     18//2                                                                 
>                                                           
>GAREA   dset                                                                  
>                                                           
>PROJ    rad                                                                   
>                                                           
>RADFIL  NEXRII|KLCH                                                           
>                                                           
>LATLON  0                                                                     
>                                                           
>PANEL   0                                                                     
>                                                           
>TITLE   31/-2                                                                 
>                                                           
>TEXT    1                                                                     
>                                                           
>CLEAR   YES                                                                   
>                                                           
>DEVICE  xw                                                                    
>                                                           
>LUTFIL  default                                                               
>                                                           
>IMCBAR  31/V/LL/.005;.05/.85;.01|.7/1/1/hw                                    
>                                                           
>TILT    0                                                                     
>                                                           
>RADPARM vr                                                                    
>                                                           
>RADTIM  040923/2229                                                           
>                                                           
>
>
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