Rich,
Thank you for the information. My data comes from an unformatted Fortran
file, and Python was the easiest way to read this data. I'd prefer to use
VisIt as I'd like to extend this project with a 2D plot with time, and then
to a 3D plot with time.
Perhaps I wasn't clear enough-- I have all the data read into Python right
now, but am having trouble writing the coordinate information into the
NetCDF. I am able to get the actual data into VisIt, but it's not
"applied" to the (200 x 100) matrix X and Y coordinate information.
>From my research, it doesn't look like NetCDF is able to do this. Perhaps
I should be using another data format for VisIt?
Thanks,
Tim
On Tue, Mar 27, 2012 at 9:20 AM, Rich Signell <rsignell@xxxxxxxx> wrote:
> Tim,
>
> You mention quite a few things here: unstructured grids, Matlab,
> NetCDF, CF, Python and Visit.
>
> If your goal is to truly to visualize unstructured grid data from
> NetCDF files (or OPeNDAP datasets) using Python, take a look at this
> screen shot using Mayavi2
>
> http://dl.dropbox.com/u/12710282/Screenshot-Mayavi.png
>
> and the simple code that produced it:
>
> http://dl.dropbox.com/u/12710282/triangular_mesh_demo.py
>
> Mayavi2 comes with at least two scientific Python distributions:
> Python(x,y) (free, works on 32 bit windows) and the Enthought Python
> Distribution (free for educational use, works on 32/64 bit windows,
> mac and linux). You should be able to run the above python script
> without changes on either distribution.
>
> However, it sounds like you actually have structured grid data in a
> text file that you want to use. In python, I would use numpy
> "genfromtxt" to read from the text file, and visualize with Mayavi2's
> "surf" function. See:
> http://github.enthought.com/mayavi/mayavi/auto/examples.html
>
> If you want to save your data in a NetCDF file, I'd use the
> NetCDF4Python package (also included in the above scientific python
> distributions). This would allow you to visualize it in other tools
> as well, like Unidata's IDV.
>
> Good Luck,
> -Rich
>
> On Mon, Mar 26, 2012 at 3:31 PM, Tim Duly <duly2@xxxxxxxxxxxx> wrote:
> > Hello,
> >
> > I have a relatively simple task. I have 2D data, of dimension 200x100
> that
> > belong to an unstructured grid that contains X and Y, both of which are
> > dimension 200x100. In other words, I have DATA = f(X,Y).
> >
> > I'm trying to plot this in VisIt, but am having a tough time applying the
> > unstructured grid to the actually data. In MATLAB, for example, this is
> > easily accomplished with surf(X,Y,DATA), but I'm having difficulties
> finding
> > the equivalent in NetCDF. How do I do this? Is this problem solved in
> > NetCDF or in VisIt?
> >
> > I am using the Python library NetCDF to transform unformatted Fortran
> data
> > into NetCDF format. I have read this page
> > (
> http://cf-pcmdi.llnl.gov/documents/cf-conventions/1.4/cf-conventions.html#id2984605
> )
> > but I do not understand how to do this with the NetCDF library in python.
> > Should I use another data format besides NetCDF?
> >
> > Any help would be greatly appreciated.
> >
> > Thanks,
> > Tim
> >
> > _______________________________________________
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>
>
>
> --
> Dr. Richard P. Signell (508) 457-2229
> USGS, 384 Woods Hole Rd.
> Woods Hole, MA 02543-1598
>
