[gradsusr] Plotting a NEXRAD netCDF file

[Jennifer Adams]

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
>> 
>> 
>> _______________________________________________
>> gradsusr mailing list
>> gradsusr at gradsusr.org
>> http://gradsusr.org/mailman/listinfo/gradsusr
> 
> --
> 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 
> 
> 
> 
> 
> 
> 
> _______________________________________________
> gradsusr mailing list
> gradsusr at gradsusr.org
> http://gradsusr.org/mailman/listinfo/gradsusr
> 
> 
> <IdaRadar-test2.png>_______________________________________________
> gradsusr mailing list
> gradsusr at gradsusr.org
> http://gradsusr.org/mailman/listinfo/gradsusr

--
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 





-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://gradsusr.org/pipermail/gradsusr/attachments/20130920/e101a051/attachment.html