"Edzer J. Pebesma" <[EMAIL PROTECTED]> writes: > >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?
hm ! If someone attempts to krige across the event horizon of a black hole, please let the list know ! ;-) p (sorry, not too helpful for Olumide) > >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 >>> + > + + To post a message to the list, send it to ai-geostats@jrc.it + To unsubscribe, send email to majordomo@ jrc.it with no subject and "unsubscribe ai-geostats" in the message body. DO NOT SEND Subscribe/Unsubscribe requests to the list + As a general service to list users, please remember to post a summary of any useful responses to your questions. + Support to the forum can be found at http://www.ai-geostats.org/
