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2521
[ai-geostats] Move of the list to Majordomo@jrc.it 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
    Gregoire Dubois
    May 16, 2006
    #2521
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    2520
    [ai-geostats] problems with mailing list 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
      Gregoire Dubois
      May 16, 2006
      #2520
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      2519
      [ai-geostats] Need your advise 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
        Reza Nazarian
        May 5, 2006
        #2519
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        2518
        Re: [ai-geostats] Need your advise 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
          seba
          May 5, 2006
          #2518
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          2517
          [ai-geostats] SGeMS 1.4, a new release 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
            Alexandre Boucher
            May 2, 2006
            #2517
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            2516
            [ai-geostats] RE: Search neighbourhood, conditional bias, etc 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... ...
              Collier, Perry (TS)
              May 2, 2006
              #2516
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              2515
              [ai-geostats] Search neighbourhood, conditional bias, etc 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
                Collier, Perry (TS)
                May 2, 2006
                #2515
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                2514
                Re: [ai-geostats] Re: about cross-validation Raimon Tolosana-Delgado, Many thanks. This was very helpful indeed. Regards Mahdi ... -- ... Mahdi Osman (PhD) E-mail: m_osm@... ... Echte DSL-Flatrate
                  Mahdi Osman
                  May 2, 2006
                  #2514
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                  2513
                  Re: [ai-geostats] Re: about cross-validation 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
                    Raimon Tolosana
                    May 2, 2006
                    #2513
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                    2512
                    [ai-geostats] Re: about cross-validation 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
                      Isobel Clark
                      Apr 27, 2006
                      #2512
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                      2511
                      Re: [ai-geostats] Uniform Conditioning Info. see Isatis examples in www.geovariances.fr Adrian Martínez Vargas Departamento de Geología ISMM, Las Coloradas s/n Moa, Holguín Cuba CP 83329 ... From:
                        Adrián Martínez Vargas
                        Apr 27, 2006
                        #2511
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                        2510
                        [ai-geostats] Uniform Conditioning Info. 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
                          Colin Badenhorst
                          Apr 27, 2006
                          #2510
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                          2509
                          [ai-geostats] about cross-validation 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
                            M. Nur Heriawan
                            Apr 27, 2006
                            #2509
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                            2508
                            Re: [ai-geostats] Re: about cross-validation 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
                              Mahdi Osman
                              Apr 27, 2006
                              #2508
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                              2507
                              [ai-geostats] uncertainty 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
                                Rajni Gaur
                                Apr 21, 2006
                                #2507
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                                2505
                                [ai-geostats] CALL FOR PAPERS – NIPS*2006 CALL FOR PAPERS – NIPS*2006 Deadline for Paper Submissions: June 9, 2006 Submissions are solicited for the twentieth annual meeting of an interdisciplinary
                                  M.O. Franz
                                  Apr 21, 2006
                                  #2505
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                                  2506
                                  Re: [ai-geostats] isatis expertise? 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
                                    Mark Sweeney
                                    Apr 21, 2006
                                    #2506
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                                    2503
                                    [ai-geostats] isatis expertise? 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
                                      acullma@...
                                      Apr 21, 2006
                                      #2503
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                                      2504
                                      [ai-geostats] istatis expertise received - more help appreciated 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
                                        acullma@...
                                        Apr 21, 2006
                                        #2504
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                                        2502
                                        Re: [ai-geostats] Re: Puzzling question 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
                                          seba
                                          Apr 19, 2006
                                          #2502
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                                          2501
                                          [ai-geostats] Re: Puzzling question 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
                                            Isobel Clark
                                            Apr 19, 2006
                                            #2501
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                                            2500
                                            Re: [ai-geostats] time series 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
                                              Dan Bebber
                                              Apr 9, 2006
                                              #2500
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                                              Re: [ai-geostats] cokriging by using GSLIB 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
                                                Pierre Goovaerts
                                                Apr 9, 2006
                                                #2499
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                                                2498
                                                [ai-geostats] cokriging by using GSLIB 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
                                                  Feng Liu
                                                  Apr 9, 2006
                                                  #2498
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                                                  2497
                                                  [ai-geostats] Puzzling question Dear Colleagues The following arguement puzzling me. Your clarification will be greatly appreciated. When a random funtion Y(x) is not stationary, then one
                                                    M.J. Abedini
                                                    Apr 9, 2006
                                                    #2497
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                                                    2496
                                                    [ai-geostats] time series 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
                                                      Yetta Jager
                                                      Apr 6, 2006
                                                      #2496
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                                                      2495
                                                      [ai-geostats] nested structures 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
                                                        Cardellini C.
                                                        Mar 29, 2006
                                                        #2495
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                                                        2494
                                                        Re: [ai-geostats] Comparing autocorrelation (semivariogram) surfaces 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
                                                          seba
                                                          Mar 29, 2006
                                                          #2494
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                                                          2493
                                                          Re: [ai-geostats] nested structures 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
                                                            diane poon
                                                            Mar 29, 2006
                                                            #2493
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                                                            2492
                                                            Re: [ai-geostats] Comparing autocorrelation (semivariogram) surfac Ciao Sebastiano, actually I am looking for statistical tests for comparing two variogram grids of two different variables to quantify probabilities to have
                                                              Gregoire Dubois
                                                              Mar 29, 2006
                                                              #2492
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