Hello Jasmina,
>From my experience it is the most appropriate to calculate so many directional >variograms as your interpolation program can import. Many of them work pretty >well by mostly two variogram axes (each of them has unique range, sill and >nugget). It implicates that you need make variogram model for (at least) two >main deposit axes (sedimentational, structural etc. characteristic of deposit, >i.e. what you choose as relevant). No, you can not replace four (or two) directional variogram by one “averaged” for all directions, i.e. by omnidirectional variogram. You will lose anisotropy. Tomislav, Croatia ________________________________ From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Isobel Clark Sent: Monday, January 14, 2008 11:45 AM To: Jamina Dogic; [email protected] Subject: Re: AI-GEOSTATS: Variogram Jamina Different software packages have different requirements for defining anisotropy. Some will allow you to define completely a model for each major axis of the anisotropy ellipse. The simplest (geometric anisotropy) just accept anisotropy 'factors' for the range of influence. In my experience, "zonal" anisotropy usually indicates geological non-homogeneity and/or discontinuities. For example, you may have a fult line which increases the apparent sill when you cross it. Or you may have different geological zones, again increasing the sill when you cross from one to the other. Isobel http://www.kriging.com Jamina Dogic <[EMAIL PROTECTED]> wrote: Dear experts, I¢ll be very grateful if you can help me with following question. I am geologist, and I need to use variogram for ore estimation process. I have problem with managing data in variography. I am looking at variation of cooper content in porphyry type of deposit and I did variograms in 4 directions. 0, 45, 90 and 135 degrees. I have both geometric and zonal anisotropy. My question is connected with final variogram model, does it means that I need to produce only one model of variogram which will be suitable for all 4 directions, some kind of average variogram model for all direction. Thanks in advance Jasmina Beljic Belgrade, Serbia ________________________________ Never miss a thing. Make Yahoo your homepage. <http://us.rd.yahoo.com/evt=51438/*http:/www.yahoo.com/r/hs> ________________________________ Never miss a thing. Make Yahoo your homepage. <http://us.rd.yahoo.com/evt=51438/*http:/www.yahoo.com/r/hs> ---------------------------------------------------------------- VAŽNA OBAVIJEST Ova elektronička pošta (i sve priložene datoteke) je povjerljiva i namijenjena je osobi ili osobama na koje je naslovljena. Ukoliko Vi ili Vaša organizacija niste navedeni primatelj ili je zbog greške pri adresiranju ili prijenosu ova poruka krivo upućena, nije dozvoljeno njen sadržaj koristiti ili dalje proslje?ivati. 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