Re: Vertical cross section and vectors

One thing you should try, if you haven't yet, is to set the resource vcMapDirection to False. See http://www.ncl.ucar.edu/Document/Graphics/Resources/vc.shtml#vcMapDirection.
 -dave

On Jul 24, 2012, at 9:05 AM, Dennis Shea wrote:

> I think you must provide a (say) png or gif.
> Also, perhaps, a clean www downloadable script and data.
>
> If that is not possible,
>
> ftp ftp.cgd.ucar.edu
> anonymous
> <use your email address for the password>
> cd incoming
> put ...
> put ...
> quit
>
> Send email to ncl-talk after you have successfully completed the
> transfer stating the exact names of the files you transferred
>
>
>
>
> On 7/23/12 10:43 PM, Tess Parker wrote:
>> Thanks Dai - I tried multiplying the /w/ component by 1000, but no luck
>> with the plot. I'm not sure what you mean by "and the vertical altitude"?
>>
>> Regards
>> Tess
>>
>> 戴国锟 wrote:
>>> Tess,
>>> You can multiply 1000 to your w-wind and the vertical altitude, so
>>> that the vertical motion will be evident.
>>> Good luck!
>>> Dai
>>>
>>> 2012/7/24 Tess Parker <tess.parker@monash.edu
>>> <mailto:tess.parker@monash.edu>>
>>>
>>> Hello all - I am trying to plot a vertical cross section, against
>>> altitude in meters, along a particular line of longitude, with
>>> vectors representing the winds.
>>>
>>> I have used ERA-Interim data, with /v/ for the meridional wind and
>>> a calculated vertical wind /w/ from the ERAI omega vertical
>>> motion, so both /v/ and /w/ are in units of m/s. These are on
>>> pressure levels, so I have used the ERAI geopotential field /z/ to
>>> calculate a height in meters for each grid point (pressure level,
>>> lat, lon). I have then used the /int2p_n/ function to interpolate
>>> the /v/ and /w/ arrays to altitude levels using the height field.
>>> All good so far.
>>>
>>> The problem I am having is in trying to plot the wind vectors. My
>>> cross section should run from 90 deg South to the equator, and
>>> from the surface to about 20,000 meters altitude. I understand
>>> that the aspect ratio of this plot will cause a problem; the
>>> horizontal axis scale is about 10^7 meters, and the vertical only
>>> about 10^4. Also, the horizontal component of the wind /v/ is of
>>> order of magnitude 10, and the vertical only about 0.01. The
>>> question is, how do I get the vectors to plot so that upward or
>>> downward motion is clearly evident? And how can I be sure that the
>>> vectors represent the true angle of the vector wind field, which
>>> is of great importance in this particular case?
>>>
>>> Many thanks for any assistance!
>>>
>>>
>>> --
>>> Tess Parker
>>> PhD Candidate
>>> School of Mathematical Sciences
>>> Room 225, Building 28
>>> Monash University, Clayton VIC 3800
>>> Phone: +61 3 9905 4458
>>>
>>>
>>>
>>> _______________________________________________
>>> ncl-talk mailing list
>>> List instructions, subscriber options, unsubscribe:
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>>>
>>>
>>
>>
>> --
>> Tess Parker
>> PhD Candidate
>> School of Mathematical Sciences
>> Room 225, Building 28
>> Monash University, Clayton VIC 3800
>> Phone: +61 3 9905 4458
>>
>>
>>
>> _______________________________________________
>> ncl-talk mailing list
>> List instructions, subscriber options, unsubscribe:
>> http://mailman.ucar.edu/mailman/listinfo/ncl-talk
>>
>
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Received on Tue Jul 24 11:48:04 2012