[ncl-talk] Enquiries on vector plottting

[David Brown]

Actually, there is a very simple way to equalize the length of the
vectors with no need to modify the data.
There is a resource called vcMinFracLengthF that specifies the length
of the minimum magnitude vector as a fraction of the maximum magnitude
vector. Setting it to 1.0 will make all the vectors the same length.
 -dave

On Fri, Jun 26, 2015 at 10:48 AM, Adam Phillips <asphilli at ucar.edu> wrote:
> Hi Keng-Oon,
> For the high and low labels: See examples 1 and 2 from the satellite
> applications page here:
> http://www.ncl.ucar.edu/Applications/satel.shtml#ex2
>
> There are a whole suite of cnHigh* and cnLow* resources.
>
> If you are interested in identifying local highs and lows you can use the
> local_min and local_max functions:
> http://www.ncl.ucar.edu/Document/Functions/Built-in/local_max.shtml
> http://www.ncl.ucar.edu/Document/Functions/Built-in/local_min.shtml
>
> Adam
>
>
> On Fri, Jun 26, 2015 at 10:38 AM, Rick Brownrigg <brownrig at ucar.edu> wrote:
>>
>> Hi,
>>
>> One thing that comes to mind is to simply normalize your vector data prior
>> to plotting. You would then use the vcRefLengthF resource to control how big
>> the vectors are in the plot.  There are plenty of examples on the examples
>> page, a basic one being veceff_1.ncl.
>>
>> http://ncl.ucar.edu/Applications/veceff.shtml
>> http://ncl.ucar.edu/Document/Graphics/Resources/vc.shtml
>>
>>
>> I don't know about the Sea Level plot -- perhaps someone else can comment
>> on that.
>>
>> Rick
>>
>>
>> On Fri, Jun 26, 2015 at 7:41 AM, KO Chiam <kochiam at gmail.com> wrote:
>>>
>>> Dear Sir/Mdm,
>>>
>>> I am new to NCL and would appreciate if you can help address the
>>> following queries. Please pardon me if they sounds too simple.
>>>
>>> I would like to plot vectors (basically wind data) using arrows but I
>>> would like the arrows to be of equal length, in other words, I am only
>>> interested in the direction but not the magnitude. May I know if there is a
>>> way to do this?
>>>
>>> Also, is there already a function call to identify and plot the high and
>>> low pressure of a mean sea level chart?
>>>
>>> The version of NCL I am using is v6.3.0.
>>>
>>> Thank you very much for your time and help.
>>>
>>> Best Regards,
>>> Keng-Oon
>>>
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>>
>>
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>
>
>
> --
> Adam Phillips
> Associate Scientist,  Climate and Global Dynamics Laboratory, NCAR
> www.cgd.ucar.edu/staff/asphilli/   303-497-1726
>
>
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