What you are looking for is called "rasterization". Matplotlib does this
deep within the codebase and is not accessible (believe me, I tried).
However, there have been other discussions in this mailing list about how
to use GDAL to rasterize a set of polygons (represented as paths),
including some links to stack-overflow questions. It isn't a complete
end-to-end solution, but the pieces are there.
Cheers!
Ben Root
On Wed, Oct 15, 2014 at 2:09 PM, David Hoese <dho...@gmail.com> wrote:
> For the first question, if I save the figure (as a PNG I'm guessing,
> unless you can save into a more array-like format), I'd have to make
> sure that there were no labels or ticks and that the axes fit the whole
> figure. I'd also have to get the dpi and size information correct, but I
> suppose it would be possible that way. I was hoping for something a
> little easier and in-memory. This might be the simplest answer the more
> I think about it.
>
> If I'm starting from the paths, I'd still have to write them to the
> "grid" array. I thought maybe the backend could do that and I magically
> get the image.
>
> I'll look in to using savefig and getting the data out.
>
> -Dave
>
> On 10/15/14, 12:42 PM, Joy merwin monteiro wrote:
> > pardon the query if it seems dumb, but why don't you do a savefig()
> > after plotting the data and then convert it to any format you like?
> >
> > alternatively, contour() and contourf() both create paths that can
> > be accessed:
> >
> > cf = contourf(.....)
> >
> > output = cf.collections.pop()
> > paths = output.get_paths()[i] # for the various contours
> >
> > the x,y coordinates can then be accessed as
> >
> > xcoords = paths.vertices.transpose()[0]
> > ycoords = paths.vertices.transpose()[1]
> >
> > you can then do whatever you wish with them.
> >
> > Joy
> >
> >
> > On Wed, Oct 15, 2014 at 9:11 PM, David Hoese <dho...@gmail.com
> > <mailto:dho...@gmail.com>> wrote:
> >
> > I've been searching and reading through source code and google
> searches
> > to see if this is possible, but no luck so far. I'm basically trying
> to
> > map some data using Basemap, use contourf to map it to an image, and
> > then put that image in a geotiff (or other format) for use in other
> GIS
> > programs. I have other tools for remapping data and creating
> geotiffs,
> > but the contour image looks better. All I would need to get this to
> work
> > would be an array representing the image inside the axes of a
> contourf
> > plot. I found a lot of geotiff -> Basemap png results, but I would
> like
> > the reverse.
> >
> > Since the plots are made using paths/patches I'm guessing I would
> have
> > to have a backend render the image and then extract the image
> somehow.
> > Does anyone have some tips or tricks to do something like this? Or
> am I
> > thinking about this completely wrong?
> >
> > Thanks for any help and if you could CC me in any replies it would be
> > much appreciated.
> >
> > -Dave
> >
> >
>
> ------------------------------------------------------------------------------
> > Comprehensive Server Monitoring with Site24x7.
> > Monitor 10 servers for $9/Month.
> > Get alerted through email, SMS, voice calls or mobile push
> > notifications.
> > Take corrective actions from your mobile device.
> > http://p.sf.net/sfu/Zoho
> > _______________________________________________
> > Matplotlib-users mailing list
> > Matplotlib-users@lists.sourceforge.net
> > <mailto:Matplotlib-users@lists.sourceforge.net>
> > https://lists.sourceforge.net/lists/listinfo/matplotlib-users
> >
> >
> >
> >
> > --
> > The best ruler, when he finishes his
> > tasks and completes his affairs,
> > the people say
> > “It all happened naturally”
> >
> > - Te Tao Ch'ing
>
>
> ------------------------------------------------------------------------------
> Comprehensive Server Monitoring with Site24x7.
> Monitor 10 servers for $9/Month.
> Get alerted through email, SMS, voice calls or mobile push notifications.
> Take corrective actions from your mobile device.
> http://p.sf.net/sfu/Zoho
> _______________________________________________
> Matplotlib-users mailing list
> Matplotlib-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>
------------------------------------------------------------------------------
Comprehensive Server Monitoring with Site24x7.
Monitor 10 servers for $9/Month.
Get alerted through email, SMS, voice calls or mobile push notifications.
Take corrective actions from your mobile device.
http://p.sf.net/sfu/Zoho
_______________________________________________
Matplotlib-users mailing list
Matplotlib-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/matplotlib-users
