Hi Sebastiano, I think Olumide's question was, what to do if the underlying manifold is not euclidean nor spheric or something regular of that kind. How would you define the distance beween pairs of points on the surface of a potatoe, or how would you lay a regular grid on a potatoe, which covers more than a local vicinity (which can be approximated planar or spherical) ? This is indeed by no means a trivial question, I think, well worth some thoughts of the geostats gurus....
I remember Gregoire Dubois has once suggested non-euclidean variography (defining distances which account for topography between the points). He is currently on hoildays, but he may have ideas about that. ciao, Peter sebastiano trevisani <[EMAIL PROTECTED]> writes: >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 >>+ ----------------------------------------------------- Peter Bossew European Commission (EC) Joint Research Centre (JRC) Institute for Environment and Sustainability (IES) TP 441, Via Fermi 1 21020 Ispra (VA) ITALY Tel. +39 0332 78 9109 Fax. +39 0332 78 5466 Email: [EMAIL PROTECTED] WWW: http://rem.jrc.cec.eu.int "The views expressed are purely those of the writer and may not in any circumstances be regarded as stating an official position of the European Commission." + + 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/
