[gradsusr] Plotting a NEXRAD netCDF file
Jennifer Adams
jma at cola.iges.org
Fri Sep 20 16:25:24 EDT 2013
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>_______________________________________________
>>> gradsusr mailing list
>>> gradsusr at gradsusr.org
>>> http://gradsusr.org/mailman/listinfo/gradsusr
>>
>>
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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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