Re: How to Extract and plot wind vectors in a box

Sir,

I tried removing that line but still am getting the same plot *.

-- *
***Regards,*
*A.R.Ragi*
*Research Scholar
*
*Centre for Atmospheric Sciences
IIT Delhi, Hauz Khas
New Delhi, India.
*
**

On Sat, Apr 7, 2012 at 19:11, Dennis Shea <shea@ucar.edu> wrote:

> You have used a graphical option (resource)
>
>
> res@vcMinDistanceF = 0.025 ; thin out vectors
>
> that does exactly what the the comment states ...
> it 'thins' the vectors.
>
> Comment or eliminate that line
>
> ;res@vcMinDistanceF = 0.025
>
>
> On 4/7/12 2:01 AM, Ragi A.R wrote:
>
>>
>>
>>
>>
>> Dear NCL users,
>>
>> I have a*.nc* file (*met_em_files* after WPS) which have U (wind) and V
>>
>> (Wind) values for the domain 7N-20N; 70E-80E and which is staggered. I
>> want to extract and unstagger them (only u and v) and then plot (u,v)
>> vector for the domain */8N; 76E-77E/* and *18N; 73E-74E* (domain
>> attached /doc1.pdf/).
>>
>>
>> The below is my approach (I modified the domain from 73E-77E and 78N-18N).
>>
>> But the issues are:
>> 1). The vectors are not as expected. I have values at all grid points
>> but only few vectors r there.
>> 2). Not able to generate the box I wanted (as highlighted in doc1.pdf).
>> 3). I wanted to plot the (u,v) vector at the four corners of the box.
>>
>> Can anyone suggest a solution to this?
>>
>>
>> load "$NCARG_ROOT/lib/ncarg/**nclscripts/csm/gsn_code.ncl"
>> load "$NCARG_ROOT/lib/ncarg/**nclscripts/csm/gsn_csm.ncl"
>> load "$NCARG_ROOT/lib/ncarg/**nclscripts/csm/contributed.**ncl"
>> load "$NCARG_ROOT/lib/ncarg/**nclscripts/wrf/WRFUserARW.ncl"
>> load "$NCARG_ROOT/lib/ncarg/**nclscripts/wrf/WRF_**contributed.ncl"
>>
>> begin
>>
>> a = addfile("met_em.d01.2009-04-**01_00:00:00.nc <http://00.nc
>> >","r")
>>
>>
>>
>> uu = wrf_user_getvar(a, "UU", 0)
>> ua = uu(1,:,:)
>> u = wrf_user_unstagger(ua,ua@**stagger)
>>
>> vv = wrf_user_getvar(a, "VV", 0)
>> va = vv(1,:,:)
>> v = wrf_user_unstagger(va,va@**stagger)
>>
>>
>> wks = gsn_open_wks("ps", "uv_plot") ; open ps file
>> gsn_define_colormap(wks,"gui_**default") ; choose colormap
>>
>> res = True ; plot mods desired
>> res@gsnMaximize = True ; maximize size
>> res@gsnSpreadColors = True ; use full colormap
>> res@gsnSpreadColorEnd = -2
>> res@lbOrientation = "vertical" ; vertical label bar
>> res@mpFillOn = True ; no map fill
>> res@vcRefMagnitudeF = 5 ; make vectors larger
>> res@vcRefLengthF = 0.025 ; ref vec length
>> res@vcMinDistanceF = 0.025 ; thin out vectors
>> res@vcGlyphStyle = "CurlyVector" ; choose wind barbs
>> res@vcLabelsOn = True
>> res@vcMonoLineArrowColor = False ; color barbs by
>> scalar
>>
>> minlat = 8
>> maxlat = 18
>> minlon = 73
>> maxlon = 77
>>
>> res@mpMinLatF = minlat
>> res@mpMaxLatF = maxlat
>> res@mpMinLonF = minlon
>> res@mpMaxLonF = maxlon
>> res@mpOutlineBoundarySets = "National"
>> res@pmTickMarkDisplayMode = "Always"
>> res@mpFillOn = False ; turn off map fill
>> res@mpOutlineDrawOrder = "PostDraw"
>>
>> plot=gsn_csm_vector_map_ce(**wks,u,v,res)
>>
>>
>> end
>>
>>
>> /-- /
>> ///Regards,/
>> /A.R.Ragi/
>> /Research Scholar
>> /
>> /Centre for Atmospheric Sciences
>>
>> IIT Delhi, Hauz Khas
>> New Delhi, India.
>> /
>> //
>>
>>
>>
>>
>>
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>>
>

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Received on Sun Apr 8 01:22:43 2012