Add spatial database implementation for interpolation via radial basis functions for 2-D and 3-D

[baagaard]

Add option to use radial basis functions for 2-D and 3-D interpolation. This will allow interpolation from any point cloud.

Compute length scale based on RMS distance to N nearest points?
Use user-specified length scale (would not work well for highly variable spacing)?

[knepley]

On Mon, Feb 10, 2014 at 7:25 PM, baagaard notifications@github.com wrote:

Add option to use radial basis functions for 2-D and 3-D interpolation.
This will allow interpolation from any point cloud.

Compute length scale based on RMS distance to N nearest points?
Use user-specified length scale (would not work well for highly variable
spacing)?

If we wanted another dependency, we could use PetRBF here.

Matt

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