Re: wind plot

Some correspondence that was inadvertently not posted to ncl-talk.

---
> Use
>>>
>>>  http://www.ncl.ucar.edu/Document/Graphics/Interfaces/gsn_csm_map_polar.shtml
>>>
>>>    wks  = gsn_open_wks("ps","liz")      ; open a ps file
>>>    res = True
>>>    res@gsnFrame = False
>>>    res@...
>>>    res@...
>>>    plot = gsn_csm_map_polar(wks,res)        ; draw global map
>>>
>>>  then overlay the wind barbs.
=============================
>>>
>>>  On 11/09/2010 11:06 AM, Liangying Zhang wrote:
>> >>>
>> >>>  Since I need Polar projection, and I couldn't find any map with it, so I
>> >>>  used gsn_csm_vector_map_polar, but I set all u and v as 0 or missing,
>> >>>  then overlay the wind barbs on it.
>> >>>
===============================
>> >>>
>>> >>>>
>>> >>>>  Did u draw a map; then overlay the wind barbs?
>>> >>>>
>>> >>>>  or did you try (say) gsn_csm_contour_n\map;\ first ; then overlay the
>>> >>>>  contours?
>>> >>>>
>>> >>>>  On 11/9/10 11:01 AM, Liangying Zhang wrote:
>>>> >>>>>  Hi Mary and Dennis,
>>>> >>>>>
>>>> >>>>>  I ended up to add wind barbs on polar plot, but got this big text "ZERO
>>>> >>>>>  FIELD" on plot, is there anyway to get rid of it?
>>>> >>>>>
==================================
>>>> >>>>>
>>>> >>>>>  On 11/08/10 15:48, Liangying Zhang wrote:
>>>>> >>>>>>  I am trying to make vector plot for some random wind data in Antarctic
>>>>> >>>>>>  area, wonder if someone had some experiences on this, and which
>>>>> >>>>>>  functions would work better.
>>>>> >>>>>>
>>>>> >>>>>>  I tried gsn_csm_vector_map_polar/ce, and interpolated the wind data to
>>>>> >>>>>>  grid box, but ended up only very few arrows.
>>>>> >>>>>>
>>>>> >>>>>>  Thanks much!
>>>>> >>>>>>  Liz
>>>>> >>>>>>
>>>>> >>>>>>  (data in wind.850.txt is in format: lat, lon, wind speed, wind
>>>>> >>>>>>  direction)
>>>>> >>>>>>
>>>>> >>>>>>
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