[R] 2/3d interpolation from a regular grid to another regular grid

From: jiho <jo.irisson_at_gmail.com>
Date: Tue, 4 Dec 2007 16:55:40 +0100


Hello R users,

I have numerical data sampled on two grids, each one shifted by 0.5 from the other.

For example:

grid1 = expand.grid(x=0:3, y=0.5:2.5)
grid2 = expand.grid(x=0.5:2.5, y=0:3)
gridFinal = expand.grid(x=0.5:2.5, y=0.5:2.5)

plot(gridFinal, xlim=c(0,3), ylim=c(0,3), col="black", pch=19) points(grid1, xlim=c(0,3), ylim=c(0,3), col="red", pch=19) points(grid2, xlim=c(0,3), ylim=c(0,3), col="blue", pch=19)

I would like to interpolate the quantities on grid1 (red) and grid2 (blue) on the same grid (black). This scenario is very common in geophysical data and models. I only found:
- functions in package akima which are designed for irregular grids

Eventually, the same scenario will occur in 3D so if the function is 3D capable it would be a plus (but I am sure the solution to this is generic enough to work in nD)

Thank you in advance.

JiHO

---
http://jo.irisson.free.fr/

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Received on Tue 04 Dec 2007 - 16:14:32 GMT

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