Olumide,
There has been some work on geostatistics on the sphere -- the
challenges faced here included, afaics (i) to find and use distance
functions, such as great circle distance, and a suitable earth model
(sphere or rather ellispsoid) and (ii) to find and use covariance
function that are positive defnite for the sphere or particular
ellipsoid used. The R packages fields (and recently, to some extent
gstat) do address some of these issues, but are constrained to be used
on Earth.
I was watching Armageddon last night, and indeed the thing didn't come
close to a sphere or ellipsoid... great to hear someone is actually
worrying about kriging on meteorites. Beyond planetary geostatistics --
this might be interstellar geostatistics?
Could you show us a bit more how you do parameterize your particular
non-planar surface?
--
Edzer
sebastiano trevisani wrote:
Hi
I'm not sure to understand what you mean when you say kriging on non
planar surface.
If you are saying that you need to interpolate on to an irregular
grid, both GSLIB and GSTAT (and so R) permit
you to interpolate whatever set of points.
Bye
Sebastiano T.
At 03.14 03/04/2007, Olumide wrote:
Hello -
(I'm relatively new to the subject and to the forum.)
Are there any methods for kriging non-planar surfaces that have no
natural parametrization e.g. a meteorite.
Thanks,
- Olumide
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