Dear Mrs. Clark, As you have mentioned,anisotropy is an important aspect in modeling. For me one question always,is: although,we have usually rather strong structures in vertical direction, the horizontal direction is very much vague and with changing every graphical parameters or search parameters,it is changed very much. 1-If every change in such parameters affect our models how can we trust them? 2- Is there any possibility to make a link between vertical and horizontal variograms ( so that we may improve,the horizontal variogram,with the help of vertical variogram)? I would appreciate to have your idea about it.
Kind Regards E. R. Khojasteh Isobel Clark <[EMAIL PROTECTED]> wrote: 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. --------------------------------- Never miss a thing. Make Yahoo your homepage. --------------------------------- Never miss a thing. Make Yahoo your homepage.
