Re: Contour Plotting of Ecological Data Using Visad

• To: Nandita Mangal <nandita_mangal@xxxxxxxxx>
• Subject: Re: Contour Plotting of Ecological Data Using Visad
• From: Bill Hibbard <billh@xxxxxxxxxxxxx>
• Date: Fri, 14 Oct 2005 14:09:52 -0500 (CDT)

Hi Nandita,

There is an example in Section 3.5 of Ugo's VisAD tutorial.
However, you'll want to substitute an Irregular2DSet for
the Linear2DSet used in that example. Use the Irregular2DSet
constructor signature:

  public Irregular2DSet(MathType type, float[][] samples)

where samples is dimensioned float[2][number_of_points]
and you set your lat coordinates into samples[0][i]
and lon coordinates into samples[1][i].

Contouring from IrregularSets does not generate labels -
if you want those then resample the FlatField you create
to a Linear2DSet (or other Gridded2DSet) that covers the
region of your Irregular2DSet.

Good luck,
Bill

On Fri, 14 Oct 2005, Nandita Mangal wrote:

> Hi there,
>
> Just looked at Visad today and was wondering if I can
> use Visad to create contours from ecological data
> (consisting of a lat,long and some Z value(say
> temperature)) in my application....If yes then could
> someone tell me where I should start/ which classes in
> Visad to explore to do the above?
>
> thanks,
> Nandita Mangal
> San Diego Supercomputer Center

• References:
  • Contour Plotting of Ecological Data Using Visad
    • From: Nandita Mangal