# [ncl-talk] Vector plot with 1-D coordinate data

Guido Cioni guidocioni at gmail.com
Fri Oct 21 12:45:28 MDT 2016

```Wow, didn’t know about that option. Thanks a lot!
Unfortunately by using this it is impossible (I guess) to control the density of the arrows since they are drawn at every lat and lon specified in the arrays, which makes the plot not really readable (see attached). I set the arrow length to almost zero, so that only the head is visible, otherwise the plot was entirely filled with black...
I should find a way of making lat, lon, u and v arrays sparser, maybe.

Also, since you are here: is there any way of making the bounding box of the plot round instead of squared, in order to follow the interior shape?

Thanks.

Guido Cioni
http://guidocioni.altervista.org <http://guidocioni.altervista.org/>

> Il giorno 21 ott 2016, alle ore 19:58, David Brown <dbrown at ucar.edu> ha scritto:
>
> Yes Hoffman is right. That could be an option for you.
> -dave
>
> On Fri, Oct 21, 2016 at 11:57 AM, Hoffman Cheung
> <hoffmancheung at gmail.com> wrote:
>> Hi Guido,
>>
>> May be you can try to draw the vector using wmvectmap?
>>
>> http://ncl.ucar.edu/Document/Functions/Built-in/wmvectmap.shtml
>>
>> Cheers,
>> Hoffman
>>
>>
>>
>> 2016-10-21 11:19 GMT+02:00 Guido Cioni <guidocioni at gmail.com>:
>>>
>>> Hi all,
>>> I believe this is more of a request for the developers.
>>>
>>> Is there any way of making a vector plot using 1-D coordinate arrays? I’m
>>> using data from an unstructured grid so that every time I have to plot
>>> something I’m always using a variable similar to var(time, level, ncell)
>>> which can be plotted with contours using the special resources sfXArray and
>>> sfYArray. However, when doing vector plots the u and v component of the wind
>>> MUST be 2-Dimensional according to the documentation. Thus, setting the
>>> appropriate resources vfXArray, vfYArray does not help…
>>> Is it something that will be implemented in 6.4 ?
>>>
>>> Cheers
>>>
>>> Guido Cioni
>>> http://guidocioni.altervista.org
>>>
>>>
>>>
>>>
>>>
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>>
>>
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