Jeff Whitaker wrote:
> Jim Vickroy wrote:
>> Hello users,
>>
>> I'm using matplotlib.toolkits.basemap.Basemap to plot data on several
>> types of projections at a regular cadence. I am presently
>> regenerating the maps each time new data is to be plotted. Is it
>> possible to generate template map projections once (at startup) and
>> reuse them each time new data is to be plotted? If so, could someone
>> point to a reference or example of how to do this?
>>
>> Thanks,
>> -- jv
>>
>
> Jim: You can reuse a Basemap instance to plot data on multiple
> figures, like this
>
> # create the first figure
> fig = pylab.figure()
> # create a Basemap instance for your map projection
> map = Basemap(...)
> # plot some stuff on this map projection.
> map.contour(...)
> ... some other plotting commands ...
> # save the figure
> pylab.savefig('plot1.png')
>
> # create another figure
> fig = pylab.figure()
> # use the same basemap instance to different data on this map projection
> map.contour(...)
> ... more plotting commands...
> # save the second figure
> pylab.savefig('plot2.png')
>
> You can also save the Basemap instance to disk using the Pickle module
> and reload it in another script.
>
> -Jeff
>
>
Thanks for the detailed explanation; I may be starting to understand the
significance of *figure*.
I was hoping to avoid repeated calls like map.drawcoastlines(),
map.drawcountries(), map.fillcontinents(color='0.95'),
map.drawmapboundary(), map.drawmeridians(plot.arange(0,360,30)), and
map.drawparallels(plot.arange(-90,90,30)). So, I will follow your
example and experiment to see what works and what does not to better
understand the behaviors.
-- jv
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