Re: resampling/evaluating 3D field of manifold dimension 2

• To: "V. Lakshmanan" <lakshman@xxxxxxxxxxxxx>
• Subject: Re: resampling/evaluating 3D field of manifold dimension 2
• From: Bill Hibbard <billh@xxxxxxxxxxxxx>
• Date: Wed, 28 Aug 2002 15:20:18 -0500 (CDT)

Hi Lak,

>
> I have a Gridded3DSet with a manifold dimension of 2:
>    Set xyzSet = new Gridded3DSet( domainTuple, xyz,
>                                        num_radials, num_gates );
>
> I have a line in 3D:
>     Set lineDomainSet = new Gridded3DSet( lineDomain,
>                                                  domainSamples, pts);
>
> and I want to find the values of the first 3D set at samples
> given by the second.  There are places where the line
> does not intersect the surface, so I will get NaN in some spots, but
> there will be points of interest as well.
>
> So, I try to do:
>     xyzSet.resample( lineDomainSet );
>
> but I get an exception:
> visad.SetException: Gridded3DSet.valueToGrid: ManifoldDimension must
> be 3
>
> Should I not be able to do this?

Yes, sorry but you should not be able to call resmaple()
for a Set whose manifold dimension is less than its
domain dimension. If possible, project your Gridded3DSets
with manifold dimension = 2 and 1 down to a 2 dimensional
domain. For your radar data, perhaps the 2-D domain
(latitude, longitude).

Good luck,
Bill

• References:
  • resampling/evaluating 3D field of manifold dimension 2
    • From: V. Lakshmanan