[ncl-talk] Small issue plotting highways

[Andrew Kren - NOAA Federal]

Thanks, I'll check it out.

On Tue, Jun 22, 2021 at 11:25 AM Rick Brownrigg <brownrig at ucar.edu> wrote:

> Hi Andrew,
>
> It's odd that you are getting inconsistent results. Do you see the same
> thing if you write to a PS or PDF file? I don't know what's going on, but
> it looks like a  bit of overzealous anti-aliasing. There's a resource to
> control whether antialiasing is applied or not:
>
> https://www.ncl.ucar.edu/Document/Graphics/Resources/wk.shtml
>
> It's on by default and generally yields better results, but you might
> experiment with it.
>
> Wish I had a better answer.
> Rick
>
>
> On Tue, Jun 22, 2021 at 8:45 AM Andrew Kren - NOAA Federal via ncl-talk <
> ncl-talk at mailman.ucar.edu> wrote:
>
>> Hi there,
>>
>> I am plotting radar data and overlaying highways onto the map. I first
>> plot the radar analysis, then overlay the highway information by
>> reading/plotting the shapefile.
>>
>> At times, when I view the PNGs, the highways show up as blotched out
>> (lack of detail and pixelated; see attached image). At other times, the
>> highways show up very clear and darker as expected. Is there a reason for
>> this? Below shows a snippet of my code that produces the radar plot and the
>> highway overlay.
>>
>>  plot = gsn_csm_contour_map(wks,radar,res)
>>
>>  ; add highway polylines to the map from shapefile
>>  plres = True
>>  plres at gsLineColor = "grey48"
>>  plres at gsLineThicknessF = 0.2
>>  id =
>> gsn_add_shapefile_polylines(wks,plot,SHAPE_DIR+"roadtrl020.shp",plres)
>>
>> Thanks,
>>
>> --
>>
>> Andrew Kren
>> Meteorologist
>> NOAA's National Weather Service
>> Raleigh Forecast Office
>> 1005 Capability Drive, Suite 300
>> Raleigh, North Carolina 27606
>> voice: 919-326-1035
>> mailto: andrew.kren at noaa.govhttp://www.weather.gov/rah
>>
>>
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>
>

-- 

Andrew Kren
Meteorologist
NOAA's National Weather Service
Raleigh Forecast Office
1005 Capability Drive, Suite 300
Raleigh, North Carolina 27606
voice: 919-326-1035
mailto: andrew.kren at noaa.govhttp://www.weather.gov/rah
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