By C. A. Gotway, B. M. Rutherford (auth.), M. Armstrong, P. A. Dowd (eds.)
When this two-day assembly was once proposed, it used to be not at all conceived as a party, less as a celebration. in spite of the fact that, in retrospect, this would were a totally applicable gesture simply because geostatistical simulation got here of age this yr: it really is now 21 years because it was once first proposed and applied within the kind of the turning bands approach. The impetus for the unique improvement used to be the mining undefined, mostly the issues encountered in mine making plans and layout according to smoothed estimates which failed to replicate the measure of variability and aspect found in the true, mined values. The sustained interval of improvement over contemporary years has been pushed via hydrocarbon purposes. as well as the unique turning bands procedure there are actually no less than six different proven tools of geostatistical simulation. Having reached maturity, it truly is totally applicable that geostatistical simulation should still now be subjected to an severe interval of mirrored image and evaluation. that we have got now entered this era was once glaring in lots of of the papers and masses of the dialogue on the Fontainebleau assembly. Many questions have been truly articulated for the 1st time and, even if many ofthem weren't unambiguously spoke back, their presentation on the assembly and booklet during this publication will generate confirmatory reviews and extra research.
Read Online or Download Geostatistical Simulations: Proceedings of the Geostatistical Simulation Workshop, Fontainebleau, France, 27–28 May 1993 PDF
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Extra info for Geostatistical Simulations: Proceedings of the Geostatistical Simulation Workshop, Fontainebleau, France, 27–28 May 1993
Sample text
We chose 100 such sets. Does you solution still apply, given the number of sets used? Daly: I'm not sure. Clearly some ofthe 100 sets will be more typical; others will not and will give quite an atypical variogram. Omre: We are discussing a very important aspect of the problem. First we have reality, which we can evaluate. Then we have a stochastic model. There is a considerable gap between these two. The largest problem is to come up with a model that is really representative of reality. But our problem today is how to simulate the model.
However, in practice, it is severely restricted by computer memory requirements. First the LU decomposition will be reviewed and than an alternative approach to the decomposition, which reduces the memory problems, will be introdueed. LU DECOMPOSITION METHOD Consider a set of grid points on which values of random variables are to be simulated. The covarianee matrix (of size n x n) of the random variables is denoted by C = (Cij)' The L-U (Lower-Upper) decomposition method is a simple technique based on the L-U triangular decomposition of the matrix of eovarianees between data locations and simulation grid nodes (Alabert, 1987; Davis, 1987a).
You can draw some conc1usions. The differences in the algorithms really do exist. Ravenscroft: I am certainly not dismissing what you have done. l am just saying that one must remember that these things are not entirely general. Chiles: I have a question on the comparison between LU decomposition and the sequential gaussian method. You say that the two methods are very different. In my opinion, both methods are equivalent because they produce multivariate normal fields except that the LU method is global and uses a unique neighbourhood whereas sequential methods need a moving neighbourhood.
