Dear All,
I am facing problem to obtain the nested variogram model for the 3D lithological data. I have 3D data, in which the coordinate are x,y,z (z corresponds to the depth) and the lithofacie information for different materials as a binary values (Ind01, Ind02, Ind03, Ind04, Ind05) . Now I would like to develop sequential indicator simulation to obtain the facies distribution for each of the category. I have used gstat to develop the vertical and horizontal varigram but unable to fit as a nested variogram for both vertical and horizontal direction. Is there any one help me to combine the vertical and horizontal variogram in one nested structure. The data I have used from the greengoblin data. A dropbox link has been placed at the end of this post to obtain the data. The code I have used as follows to obtain the vertical and horizontal variogram for the Ind03 facies (medium sand) green_gstat <- as.data.frame(green_goblin) coordinates(green_gstat) = ~X+Y+Z names (green_gstat) class(green_gstat) # vertical variogram ind03_vert <- variogram((Ind03)~X+Y+Z, green_gstat, cutoff = 250, width= 2, alpha= 0, beta = 90) # fitting the variogram model ind03_fit <- fit.variogram (ind03_vert, vgm(1, "Exp", 500,1)) # plotting plot(ind03_vert, ind03_fit) # estimating the horizontal variogram in omni direction Ind03_hori_omni <- variogram(ind03, cutoff = 15000, width = 1000, alpha = 0) # fiting variogram mdoel ind03_fit_dir <- vgm(.188, "Exp", 1500, .05, anis = c (45, .25)) # obtain the fit model informaiotn Ind03_fit_vrio_hor <- fit.variogram(Ind03_hori_omni,vgm(.188, "Exp", 1500, .05, anis = c (45, .25))) # plotting the data plot(Ind03_hori_omni,ind03_fit_dir) # now I have tried to go for the nested variogram approach, typically what I have found there, that one can create the nested model like this from the same variogram, but using diffent fitting options. ind03_vertnested <- fit.variogram (ind03_vert, vgm (1, "Exp", 500, add.to = vgm (.188, "Exp", .05, anis = c(45, 0.25)))) here I have only used the ind03_vert (variogram), but I also have a horizontal variogram model (Ind03_hori_omni). So, how I can incorporate two model into a single variogram model. A feedback in this regard would be highly appreciate. Or, is there any other option to create a 3D variogram modeling. To have the data, please follow this dropbox link for the easy access. Link to the data- https://www.dropbox.com/s/6xl8zh7ofntlna6/GreenGoblin.csv?dl=0 -- A.B.M Firoz Researcher- GIS & Hydrological Modeling ITT- Institute for Technology and Resources Management in the Tropics and Subtropics Technology Arts Sciences TH Köln - University of Applied Sciences T: +49 221 8275-2059 F: +49 221 8275-2736 E : <mailto:abm.fi...@fh-koeln.de> abm.fi...@fh-koeln.de Kalk- Campus RobertStrasse 2 51105 Köln Germany <http://www.tt.fh-koeln.de/> www.tt.fh-koeln.de <http://www.th-koeln.de/> www.th-koeln.de
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