AI-GEOSTATS: cokriging and ked

2003-01-16 Thread Alvaro Silva
Hello Thanks to all that give me some help on the cokriging (Tom, Donald, Susan and Tomislav). By reading Goovaerts (hello thanks for your course in Lisbon last November) paper on precipitation estimation including elevation, I notice that cokriging presents smooth surfaces, but I think this

AI-GEOSTATS: Rodograms for large-scale structures ?

2003-01-16 Thread Gregoire Dubois
To my question on the use of rodograms I got the two following references: Paul Harris gave me the following: Journel A. 1988. +IBw-New distance measures: the route toward truly non-gaussian geostatistics+IB0, mathematical geology vol 20 no 4. Pierre Goovaerts mentioned at paper presented at

AI-GEOSTATS: Rodograms for large-scale structures ? (Reposting)

2003-01-16 Thread Gregoire Dubois
Sorry for this re-posting, but a few signs have been improperly converted in my text editor. Here it is again. +++ To my question on the use of rodograms I got the two following references: Paul Harris gave me the following: Journel

AI-GEOSTATS: GeoComputation special session

2003-01-16 Thread Peter Atkinson
Dear All Here is a call for abstracts for a special session at the forthcoming GeoComputation'03 conference to be held on 8-10 September 2003 in Southampton, UK. I hope that this is of interest to some of you. With best wishes Peter Spatially Distributed Modelling of Land Surface Processes A

Re: AI-GEOSTATS: cokriging and ked

2003-01-16 Thread Pierre Goovaerts
Hello, It is my experience that, for a given data set, the impact of secondary information is usually more pronounced when using KED (kriging with external drift) or SKLM (simple kriging with local means) instead of cokriging. Several factors will control the relative influence of secondary

Re: AI-GEOSTATS: Rodograms for large-scale structures ? (Reposting)

2003-01-16 Thread Pierre Goovaerts
Gregoire, I believe I borrowed the term large-scale structure from the 1992 Gslib user's manual, note that the rodogram is not an option in the lastest release of Gslib. The terminology might be misleading since we mean features on the horizontal semivariogram axis (like range) as opposed to