[R-sig-Geo] reboxing, or 3D interpolation?

[Edzer Pebesma]

Package gstat provides 3D interpolation:

library(gstat)
demo(gstat3D)

in this case, if you'd leave out the variogram model, inverse distance
is used for interpolation.

An typical issue is, independent whether the third dimension represents
z (vertical space) or time, that variability, or spatial correlation, in
x/y differs from that in z for the same distance unit (where "same" is
only meaningful when z is vertical space). You can then rescale z, or
use anisotropic variogram models.

On 11/01/2012 07:44 AM, Tom Roche wrote:
> 
> Having done "regridding" (aka 2D interpolation), I'd like to know
> how to do "reboxing" (aka 3D interpolation) in R. Can anyone point me
> to docs explaining how to do this, or example code that does this?
> What I mean, why I ask:
> 
> I'm a student attempting to incorporate N2O emissions inventories
> (EIs), initial conditions (ICs), and boundary conditions (BCs) from
> relatively coarse-scaled global inventories (with horizontal grids on
> the order of degrees lon-lat) into a relatively fine-scaled regional
> atmospheric model (12-km LCC horizontal). The emissions are all from
> surface, hence effectively 2D, and I now know how to "regrid," or
> interpolate from one 2D grid to another.
> 
> However the model and the N2O IC/BCs are 3D: the cells are boxes,
> not just grids. And of course the model (on the one hand) and the
> N2O IC/BCs have different vertical layering (i.e., numbers of layers,
> and top height, or maximum vertical extent), as well as different
> horizontal grids. I'd like to know: is there R code available that
> will "rebox," i.e., interpolate vertically as well as horizontally?
> 
> thanks in advance, and feel free to forward, Tom Roche <Tom_Roche at pobox.com>
> 
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-- 
Edzer Pebesma
Institute for Geoinformatics (ifgi), University of Münster
Weseler Straße 253, 48151 Münster, Germany. Phone: +49 251
8333081, Fax: +49 251 8339763  http://ifgi.uni-muenster.de
http://www.52north.org/geostatistics      e.pebesma at wwu.de