Dear all, For various technical reasons, AI-GEOSTATS has to move again after 2 years running with the SYMPA mailing list server from the University of ...
2520
Gregoire Dubois
aigeostats
May 16, 2006 8:17 am
Dear all, I'm currently trying to figure out what is going on with the list server of ai-geostats: 90% of the addresses registered are bouncing and I received...
2519
Reza Nazarian
rnazarian@...
May 5, 2006 9:47 am
Dear Experts I have a problem to solve. I want to create a porosity map or a porosity 3D grid or volume out of some borehole information. I am using methods...
2518
seba
sebastiano.trevisani@...
May 5, 2006 9:46 am
dear Reza Nazarian I think that there are many things to say about this topic.....(for example the idea to use a gaussian distribution for porosity should be...
2517
Alexandre Boucher
alexandre.boucher@...
May 2, 2006 10:07 am
Dear ai-geostat community, A new version (1.4) of the open source Stanford Geostatiscal Earth Modeling Software, SGeMS, has now been released. You may...
2516
Collier, Perry (TS)
Perry.Collier@...
May 2, 2006 10:06 am
Ps: Found a good start in THE KRIGING OXYMORON: A CONDITIONALLY UNBIASED AND ACCURATE PREDICTOR (2nd EDITION) by Isaaks, but the maths made me see stars... ......
2515
Collier, Perry (TS)
Perry.Collier@...
May 2, 2006 10:06 am
Hi List Maybe this topic has been done to death, but I'd like to poke the carcass if I may... Edward Isaaks via AI (15 February 2006) said of a paper by Van et...
2514
Mahdi Osman
m_osm@...
May 2, 2006 10:06 am
Raimon Tolosana-Delgado, Many thanks. This was very helpful indeed. Regards Mahdi ... -- ... Mahdi Osman (PhD) E-mail: m_osm@... ... Echte DSL-Flatrate...
2513
Raimon Tolosana
raimon.tolosana@...
May 2, 2006 10:05 am
Dear Mahdi Quickly said, you cannot compare both nuggets, because they do not share units... (well, the logarithmic one may be considered to have no units, but...
2512
Isobel Clark
drisobelclark@...
Apr 27, 2006 12:22 pm
Hi Prior to 1983, most people used cross validation to check whether their kriging methods were working or to compare one kriging method with another. After...
2511
Adrián MartÃn...
amvargas@...
Apr 27, 2006 12:18 pm
see Isatis examples in www.geovariances.fr Adrian MartÃnez Vargas Departamento de GeologÃa ISMM, Las Coloradas s/n Moa, HolguÃn Cuba CP 83329 ... From:...
2510
Colin Badenhorst
CBadenhorst@...
Apr 27, 2006 12:17 pm
Hi List, Can anyone recommend some references to a mine geologist looking for an introduction to Uniform Conditioning? I'm especially interested in it's ...
2509
M. Nur Heriawan
mn_heriawan@...
Apr 27, 2006 12:16 pm
Dear everyone, One of my colleague asked me about the mathematical equation of cross-validation method (leave-one-out method), and I said that it depends on...
2508
Mahdi Osman
m_osm@...
Apr 27, 2006 12:16 pm
Dear Isobel Clark, Dear List, I have your posting regrding cross validation. Yesterday and this morning I had similar, but not identical, problems. So I was...
2507
Rajni Gaur
rajni.geophy@...
Apr 21, 2006 8:04 am
Respected List, I have the correlation curves for two different dataset of the same region, at two different timings. I have two equations y=m1x + c1 and ...
2506
Mark Sweeney
MarkSweeney@...
Apr 21, 2006 8:03 am
Dominik As a first pass you should try looking for duplicate values. From my experience Isatis falls over when kriging with duplicate data. Isatis has a...
2505
M.O. Franz
nips06pub@...
Apr 21, 2006 8:03 am
CALL FOR PAPERS – NIPS*2006 Deadline for Paper Submissions: June 9, 2006 Submissions are solicited for the twentieth annual meeting of an interdisciplinary...
2504
acullma@...
Apr 21, 2006 8:03 am
Dear List, Thank you for all your help: It's been 'duplicates' that caused my problems. Now I'm running into further difficulties: I'm using disjunctive...
2503
acullma@...
Apr 21, 2006 8:03 am
Dear list, I am trying to compare kriging results from different geostats software. The sample size is smaller than 300, I use real data as well as simulated ...
2502
seba
sebastiano.trevisani@...
Apr 19, 2006 12:06 pm
Hi You could also express the variogram in this other form........ 2gamma(h) = Var{Z(u)-Z(u+h)} = E{[Z(u)-Z(u + h)]^2}-E{ Z(u)-Z(u+h)}^2 the second element of...
2501
Isobel Clark
drisobelclark@...
Apr 19, 2006 12:06 pm
Hi. At last one I can answer (i.e. an easy one): If the phenomenon is non-stationary then the semi-variogram is NOT: (1) 2\gamma(x,x')=Var[Y(x)-Y(x')]^2 but ...
2500
Dan Bebber
danbebber@...
Apr 9, 2006 5:53 pm
Yetta, if you are using R, then try ?acf. There is a good intro in MASS4. Also library(tseries). AFAIK, you can use geostatistics on time series, as you would...
2499
Pierre Goovaerts
Goovaerts@...
Apr 9, 2006 5:52 pm
Hi Feng, Indeed, you need to create a single file with the two variables combined and use a "missing value code" (i.e. below the trimming limit) at all...
2498
Feng Liu
asherliu@...
Apr 9, 2006 5:52 pm
Dear list: I was trying to use cokriging to estimated soil N content while using NDVI as a secondary variable. I am confused of how GSLIB arrange the...
2497
M.J. Abedini
abedini@...
Apr 9, 2006 5:52 pm
Dear Colleagues The following arguement puzzling me. Your clarification will be greatly appreciated. When a random funtion Y(x) is not stationary, then one...
2496
Yetta Jager
jagerhi@...
Apr 6, 2006 10:54 am
Dear list, Is anyone familiar with both time series (i.e., lagged distribution and panel models) and geostatistics? I am having trouble finding methods for ...
2495
Cardellini C.
geochem@...
Mar 29, 2006 8:40 am
Dear List members, can you suggest papers or book about the interpretation (e.g. geologic interpretation) of nested structures? More in detail I have data set...
2494
seba
sebastiano.trevisani@...
Mar 29, 2006 8:35 am
Ciao Gregoire I had the feeling that you need some automatic stuff!!! In this case, probably, the idea to compare variogram model parameters isn't good because...
2493
diane poon
diane.poon@...
Mar 29, 2006 8:34 am
if anyone has information on this i'd love to hear it I also have nested structures from my semi-variogram analysis of peatland structures diane ... -- "I love...
2492
Gregoire Dubois
aigeostats
Mar 29, 2006 8:33 am
Ciao Sebastiano, actually I am looking for statistical tests for comparing two variogram grids of two different variables to quantify probabilities to have...
