Geoscience Reference
In-Depth Information
the average variogram versus discretiza-
tion level (starting with 1 × 1 × 1 and going
to 20 × 20 × 20). Plot two lines—one with
the zero values for coincident discretization
points and another for this corrected.
Question 2:
Calculate the average variogram for regular
cubic block sizes from 1 through 20 m with
the zero effect correctly handled. Comment
on your choice of discretization level. Plot
and tabulate (1) the average variogram versus
block size, and (2) the block variance versus
block size.
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7.6.3
Part Three: Change of Shape Models
The global mean does not change with scale. The variance
changes in a predictable manner; however, the shape change
is not precisely known.
Question 1:
Consider cubic block sizes of 5, 10, and 20 m.
Calculate the scaled distributions using the
(1) afine, (2) indirect lognormal, and (3) dis-
crete Gaussian models. Plot the original Cu
histogram and all of the scaled histograms.
Comment on the results.
Question 2:
Attempt to quantify the importance of the
shape change by plotting grade tonnage
curves at the 10 m scale. Discuss the differ-
ent models and explain where you require
such a model.
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