[gradsusr] Plotting a NEXRAD netCDF file

[Jeff Duda]

Specifically which product did you convert?  Was it level 2 or level 3 data?

Jeff Duda


On Fri, Sep 20, 2013 at 3:34 PM, Sytske Kimball
<skimball at southalabama.edu>wrote:

> Jennifer,
>
> I agree. Not sure how that happened. I used NOAA's Weather and Climate
> Toolkit to convert the radar data to netCDF so maybe something went amiss
> in that process.
>
> Thanks for your help,
> Sytske
>
>
> Sytske (seets-kah) Kimball
> Professor of Meteorology
> Director, South Alabama Mesonet
> Dept. of Earth Sciences
> University of South Alabama
> Mobile, AL
> phone (251) 460-7031
> fax       (251) 460-7886
> email   skimball at southalabama.edu <skimball at usouthal.edu>
> web:   http://chiliweb.southalabama.edu/
>
>
>
> On Fri, Sep 20, 2013 at 3:25 PM, Jennifer Adams <jma at cola.iges.org> wrote:
>
>>
>> On Sep 20, 2013, at 4:17 PM, Sytske Kimball wrote:
>>
>> Jennifer,
>>
>> Thanks for your response. Replies are added in below.
>>
>>
>> On Fri, Sep 20, 2013 at 3:03 PM, Jennifer Adams <jma at cola.iges.org>wrote:
>>
>>>
>>> On Sep 20, 2013, at 3:47 PM, Andrew Friedman wrote:
>>>
>>> Hi Sytske,
>>>
>>> In your script you have 2 plot settings right after each other:
>>>
>>> 'set gxout grfill'
>>> 'set gxout shaded'
>>>
>>> I believe the second one overrides the first. Try commenting it out to
>>> see what the grfill plot looks like.
>>>
>>> That's right -- grfill will give a better view of actual grid box size.
>>> What does 'q ctlinfo' give you after you invoke sdfopen?
>>>
>>
>> The plot with 'set gxout shaded' commented out, is attached - not very
>> nice looking...….
>>
>> True, but that pixelated nature of the data explains why your shaded plot
>> looked even worse.
>>
>>  'q ctlinfo' came back with the following:
>>
>> dset KMOB_V03_20091110_035730.nc
>> title Nexrad 2 radar dataset  03:57:30 UTC  11/10/2009
>> undef -999
>> dtype netcdf
>> xdef 800 linear -127.06 0.0776505
>> ydef 490 linear 20.4756 0.0776505
>>
>> Which is about an 8km grid. I'm guessing the radar data is much higher
>> resolution than that.
>> --Jennifer
>>
>>
>>
>> zdef 1 linear 0 1
>> tdef 1 linear 03:57Z10NOV2009 1mn
>> vars 1
>> Reflectivity=>reflectivity  0  t,y,x  Nexrad 2 radar dataset
>> endvars
>>
>>
>>
>>>
>>>
>>> Also, you could try changing the shaded plot setting to the
>>> higher-resoluttion algorithm:
>>> 'set gxout shade2b'
>>>
>>> shade2b is not higher resolution -- it has more smaller polygons and
>>> takes longer to render. shade2 and shade2b should look exactly the same.
>>>
>>
>> 'set gxout shaded' and 'set gxout shade2' look the same.
>>
>> Sytske
>>
>>
>>
>>>
>>>  --Jennifer
>>>
>>>
>>> Andrew
>>>
>>> On Sep 20, 2013, at 12:23 PM, Sytske Kimball <skimball at southalabama.edu>
>>> wrote:
>>>
>>> Dear GrADS users,
>>>
>>>
>>> I (finally) managed to plot a NEXRAD radar reflectivity fil, in netCDF
>>> format, using GrADS. The plot is attached (IdaRadar-test.png) as is the
>>> original radar image for the same area, displayed using GRLevelII
>>> (RadarLevel2.png). I can't figure out why the resolution on the GrADS image
>>> is so much worse than on the original image. The script is also attached.
>>>
>>>
>>> Any help would be much appreciated.
>>>
>>>
>>> Thank you in advance,
>>>
>>> Sytske
>>>
>>>
>>> Sytske (seets-kah) Kimball
>>>
>>> Professor of Meteorology
>>>
>>>  Director, South Alabama Mesonet
>>>
>>> Dept. of Earth Sciences
>>>
>>> University of South Alabama
>>>
>>> Mobile, AL
>>>
>>> phone (251) 460-7031
>>>
>>> fax       (251) 460-7886
>>>
>>> email   skimball at southalabama.edu
>>>
>>> web:   http://chiliweb.southalabama.edu/
>>>
>>> <RadarLevel2.png><IdaRadar-test.png><StationPlot+radar2.gs
>>> >_______________________________________________
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>>>
>>>
>>> _______________________________________________
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>>>
>>>  --
>>> Jennifer M. Adams
>>> Center for Ocean-Land-Atmosphere Studies (COLA)
>>> 111 Research Hall, Mail Stop 2B3
>>> George Mason University
>>> 4400 University Drive
>>> Fairfax, VA 22030
>>>
>>>
>>>
>>>
>>>
>>>
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>>>
>> <IdaRadar-test2.png>_______________________________________________
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>>
>>  --
>> Jennifer M. Adams
>> Center for Ocean-Land-Atmosphere Studies (COLA)
>> 111 Research Hall, Mail Stop 2B3
>> George Mason University
>> 4400 University Drive
>> Fairfax, VA 22030
>>
>>
>>
>>
>>
>>
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>
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-- 
Jeff Duda
Graduate research assistant
University of Oklahoma School of Meteorology
Center for Analysis and Prediction of Storms
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