Re: AI-GEOSTATS: large dataset and variography...estimation...sim

2010-04-21 Thread Ulrich Leopold
Hi Younes, maybe take a (stratified) random sample of your data to reduce the computational time for the variography. For predictions you might want to use a local search neighbourhood if that is a feasible approach for your problem. Ulrich Younes Fadakar wrote: Hi everybody, G'day.

AI-GEOSTATS: Re: large dataset and variography...estimation...sim

2010-04-21 Thread Isobel Clark
Younes You can try what we used to do in the bad old days when it took 20 minutes to calculate a semi-variogram on 1,000 samples -- moving windows. Choose a sub-region size which includes about 1,000 samples. Calculate and graph from the samples in this window. Shift half-a-window in one