13 Data Set Data and image produced at the High-Resolution X-ray Computed Tomography Facility of the University of Texas at Austin Burrow porosity in Miami Limestone barrier bar deposited during the last interglacial (maximum unit thickness ~ 1m) Photo: Mike Wacker/USGS
14 Borehole Televiewer Data New USGS Project Image provided courtesy of A. Manda, Florida International University and the United States Geological Survey.
16 3-D Coordinate Extraction Columns map to x,y Rows map to z
17 Omnidirectional Sample Variogram # # One variable definition: # to start the variogram modelling user interface. # data(BH1): '../BH1.dat', x=1, y=2, z=3, v=4; 4 inch diameter Number of pairs Command file
18 Approximate Simple Variogram Model gstat 2.4.1 (12 March 2003), BH1.cmd enter/modify data choose variable : BH1 calculate what : semivariogram cutoff, width : 7.5, 0.1 direction : total variogram model : 0.0639973 Nug(0) + 0.178246 Exp(0.622207) fit method : OLS (unwweighted)
19 Indicator Simulation # # Unconditional Gaussian simulation on a mask # (local neigbourhoods, simple kriging) # # dummy defines empty variable: data(dummy): dummy, sk_mean=0.5,min=20, max=40; # local neighbourhood; variogram(dummy): 0.0639973 Nug(0) + 0.178246 Exp(0.622207); data(): 'grid.dat', x=1, y=2, z = 3; # prediction locations method: is; # Indicator simulation instead of kriging set output = 'is.out'; Need to remove header and extraneous information and sort by layer to run file through MATLAB script for slice generation
20 Use ImageJ for raw volume creation from slice data Visualize with 3dView