[gradsusr] strmden/skip

[Jennifer M Adams]

Use the lterp() function to coarsen the grid of your wind fields to spread out the streamlines. You might also try tweaking the spatial domain a little bit, or playing with other strmden values  — try using -8 or -2 to see how that affects things. My recollection is that -1 to -10 is not necessarily a linear path in the same way that 1 to 6 is, but it’s been a while since I played with high-res streamlines. —Jennifer

> On Jan 12, 2018, at 9:53 AM, sim.aberson <sim.aberson at noaa.gov> wrote:
> 
> Thanks for the response.  Yes, I want to overlay fields on the wind field, and there are far too many streamlines to see anything with set strmden -10.
> 
> This then brings up the question, is there a way to regrid within grads 2.0+, or do I need to regrid with some other code and then use the regridded files to plot.  I could not find anything in the grads documentatoin about regridding.
> 
> Thanks.
> 
> On 1/12/18 6:09 AM, Davide Sacchetti wrote:
>> no chance using skip: use strmden
>> if strmden is not "strong" enough you could regrid your data on the fly
>> to coarser resolution and plot regridded data
>> bye bye
>> Davide
>> On Thu, 2018-01-11 at 15:58 -0500, sim.aberson wrote:
>>> I have a high-resolution wind analysis
>>> 
>>>   XDEF    501   LINEAR   -5.00000    0.02000
>>>   YDEF    401   LINEAR   -4.00000    0.02000
>>> 
>>> When I plot using
>>> 
>>>    'set gxout stream'
>>>    'set strmden -10'
>>>    'set cint 5'
>>>    'set clevs  5 10 02 20 25 30 35 40 45 50 55 60 65 70 75 80'
>>>    'set ccols  9 14  4 11  5 13  3 10  7 12  8  2  6  9  5 10'
>>>    'd urel;vrel;mag(urel,vrel)'
>>> 
>>> I get the attached.  I want even fewer streamlines than that, but
>>> the
>>> documentation states that density is between -10 and 10.
>>> 
>>> I tried to use skip, but that seems to only work for arrows and
>>> barbs,
>>> not streamlines.  I tried to create new variables using something
>>> like
>>> 
>>>    'define uskip=skip(urel,2,2)'
>>>    'define vskip=skip(vrel,2,2)'
>>>    'd uskip;vskip;mag(uskip,vskip)'
>>> 
>>> and I tried
>>> 
>>>    'd
>>> skip(urel,2,2);skip(vrel,2,2);mag(skip(urel,2,2),skip(vrel,2,2))'
>>> 
>>> and got the same thing for both, a blank plot.
>>> 
>>> Any suggestions?
>>> 
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--
Jennifer Miletta Adams
Center for Ocean-Land-Atmosphere Studies (COLA)
George Mason University