James Boyle wrote:
> when I call quiver in the Basemap toolkit, the scale keyword has the
> effect of eliminating all vectors, no matter what value I assign
> (except None).
> I am using matplotlib 0.87.3 - Basemap 0.9
> In any case the exact effect of the scale parameter is obscure - how
> does is scale? units/inch, units/gridbox ???
>
> Thanks for any help.
> --Jim
>
>
> the calls I use are below:
> mercMap =
> Basemap(llcrnrlon=120.,llcrnrlat=-20,urcrnrlon=200.,urcrnrlat=20.,\
> resolution='c',area_thresh=10000.,projection='merc',\
> lon_0=160.,lat_ts=0.)
> istride = 3
> mercMap.quiver(x[::istride,::istride],y[::istride,::istride],uERA[::
> istride,::istride],vERA[::istride,::istride],scale=None)
>
>
>
Jim: Basemap passes the scale keyword directly to matplotlib quiver.
From the docstrings in quiver.py:
* scale = None | float
data units per arrow unit, e.g. m/s per plot width;
a smaller scale parameter makes the arrow longer.
If None, a simple autoscaling algorithm is used, based
on the average vector length and the number of vectors.
I just tried changing the projection to 'merc' in the quiver_demo.py
example, and it looked OK with the default (scale=None).
-Jeff
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