How to fix the variogram in Kriging method?

Dear all,

I'm now importing the elevation into slices (assign, database) using Kriging method. There automatically appears "variogram and spherical model", but I find the variogram doesn't fit so good the data. How can I change the variogram to have a better function?

One more question: How do you choose the method of regionalization (among Kriging, Akima,...)?

Thanks a lot for any help!

Thuy.

You choose the method by clicking the corresponding radio button in the regionalization dialog. The variogram computation for Kriging is fixed. If you need to modify the variogram, I'd recommend to do the interpolation in external geostatistical software, create a raster with many points and 'import' the values back to FEFLOW, using simple inverse distance weighting with only onei neighbor.

Thank you very much!

Dear Mr. Peter Schätzl,

Thank you very much for your reply.

I want to ask again my second question: How do you choose the method of regionalization (among Kriging, Akima,...)? I mean that how do you know which method is better for your regionalization.

I hope you could give me some suggestions.

With best regards,
Thuy.

This is a difficult question. On the one hand, you can decide based on the result (practical approach), i.e., you do the interpolation and check the result for plausibility. On the other hand, you can try do a more theoretically based decision. For this, please refer to related literature about geostatistics.