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Process Help FFUNC - estimate the geostatistical F-function |
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Process Name |
Menu Path |
Link to Command Table |
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FFUNC |
Estimate ribbon | SMU Analysis | F Function |
Introduction
Estimate the geostatistical F function.
How to use
The F function estimates the variance of a point in a block, based on a variogram model which is selected from the input variogram model file VMODPARM.
The block whose F value is to be calculated is simulated by a 3 dimensional matrix of discretisation points. The F value is calculated as the average value of the variogram between each possible pair of discretisation points.
The number of discretisation points in each of the X, Y and Z directions is specified by parameters IPOINTS, JPOINTS and KPOINTS. It is recommended that a minimum of 4 x 4 x 4 points is used. The processing speed is proportional to the number of points used.
You will be prompted interactively to enter the X, Y and Z dimensions of the block. The F value will be displayed in the Output window, and you may then enter the dimensions of another block, or ! to terminate the process.
By estimating the F-function for two block sizes, the theoretical Dispersion Variance for selective mining units within a kriged block can be calculated. This can then be used as input to processes SMUHIS and SMUMOD.
Files, Fields and Parameters
Input Files
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Name |
Description |
I/O Status |
Required |
Type |
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VMODPARM |
Input variogram model file. |
Input |
Yes |
Variogram - Model |
Output Files
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Name |
I/O Status |
Required |
Type |
Description |
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OUT |
Output |
No |
Undefined |
Optional output file. This will contain the block dimensions and F value in fields XINC, YINC, ZINC and FVALUE. |
Parameters
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Name |
Description |
Required |
Default |
Range |
Values |
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VMODNUM |
Variogram model number, as defined by VREFNUM field in VMODPARM file. Default (1). |
No |
1 |
Undefined |
Undefined |
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LOG |
Log/Normal variogram flag. Default(0). The variogram model, as defined by VGRAM , is Normal if LOG =0 or Lognormal if LOG =1. |
No |
0 |
0,1 |
0,1 |
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IPOINTS |
Number of discretisation points in X dimension to simulate block (6) |
No |
6 |
Undefined |
Undefined |
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JPOINTS |
Number of discretisation points in Y dimension to simulate block (6) |
No |
6 |
Undefined |
Undefined |
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KPOINTS |
Number of discretisation points in Z dimension to simulate block (6) |
No |
6 |
Undefined |
Undefined |
Notes
You will be prompted interactively to enter the dimensions of the block whose F value is required.
Example
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!FFUNC
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&VMODPARM(vmodel), &OUT(fvalues), @VMODNUM=1, @LOG=0, |
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@IPOINTS=6, @JPOINTS=6, @KPOINTS=6 |
Calculation of Average Value of Variogram within 3D Block
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Variogram model file VMODEL includes fields for up to 9 structures.
The file contains 10 records.
Model 1.00 has been retrieved from file.
Number of fully defined structures = 2
N Nugget Variance = 1.6000
G1 Rotation Angle 1 = 22.5 X1 Rotation Axis 1 = 3 (Z)
G2 Rotation Angle 2 = 0.0 X2 Rotation Axis 2 = 2 (Y)
G3 Rotation Angle 3 = 180.0 X3 Rotation Axis 3 = 1 (X)
Structure Model Type Range X Range Y Range Z Spatial Var
T AX AY AZ C
1 1 19.0 23.0 43.0 2.9000
2 1 38.0 64.0 90.0 2.3000
3 1 - - - -
Number of discretisation points in X,Y,Z = 6 6 6
You will now be prompted to enter the X,Y and Z dimensions of the 3D block.
Enter the next block size (or ! to terminate):
----------------------------------------------
X Block Size >10
Y Block Size >12
Z Block Size >5
F-function estimate for block of size 10.000 x 12.000 x 5.000
Average value of variogram in block = 3.1309
Enter the next block size (or ! to terminate):
----------------------------------------------
X Block Size >!
Error and Warning Messages
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Message |
Description |
Solution |
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