[gradsusr] Plotting a NEXRAD netCDF file

[Sytske Kimball]

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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>>
>>  --
>> 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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