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

[David Brown]

Yes you will need to thin the vectors yourself.

There is the resource 'mpEllipticalBoundary' that will make the boundary
around the map elliptical (circular in this case as a limiting case of
elliptical). But you may also need to turn off the tickmarks. The polar
stereographic has specialized tickmark code that can put the tickmarks
around a circular boundary. In the general case however no tickmarks are
provided for elliptical boundaries. It's not clear from this plot what
projection you are using.
 -dave


On Fri, Oct 21, 2016 at 12:45 PM, Guido Cioni <guidocioni at gmail.com> wrote:

> 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
>
>
>
>
> 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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