AI-GEOSTATS: Sensitivity analysis of automatic variogram fitting

2003-02-11 Thread Gregoire Dubois
Dear all, I'm looking for papers investigating the sensitivity of automatic variogram fitting functions to outliers. I'm aware of Genton's work on robust variograms but still look for papers. Of course I would welcome a discussion about such topic. Unless I'm completely out of date, most

AI-GEOSTATS:

2003-02-11 Thread Nicole Gerlach
Question about normal score transformation with regard to kriging. I would like interpolate soil-parameters, which have been transformed by the normal score transformation before. What should I consider with regard to the backtransformation? Is a straight back-transform possible or is there any

AI-GEOSTATS: Universal krigin with a lineal drift

2003-02-11 Thread Adrian Martínez Vargas
I'm working with GSLIB90, and I need to perform Universal krigin with a lineal drift in vertical direction. The question is: a) It's necessary to calculate de variogram of residuals? b) How to get the residuals (gslib90 can calculate can calculate de drift, but first it need de

Re: AI-GEOSTATS:

2003-02-11 Thread Pierre Goovaerts
Dear Nicole, We discussed this problem in the following paper: Saito, H. and P. Goovaerts. 2000. Geostatistical interpolation of positively skewed and censored data in a dioxin contaminated site. Environmental Science Technology, vol.34, No.19: 4228-4235. We found that a straight

AI-GEOSTATS: Variogram computing and fitting codes

2003-02-11 Thread Serele, Charles
Hello All, I'm looking some C codes to compute and fit (with spherical and exponential models) experimental variograms. I know that many software can do that, but I have more than 100 samples data over which I have to generate the variograms and modeled them to find out the range and sill values.