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• ## AI-GEOSTATS: nugget of a "support"-variogram, given a pointvariogram

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• Dear members of the list, I m a mining engineering student, following an introductional geostatistics course (22.5h). In a theoretical exercise, a
Message 1 of 2 , Dec 18 2:07 PM
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Dear members of the list,

I'm a mining engineering student, following an introductional geostatistics course (22.5h).

In a theoretical exercise, a point-semivariogram is given with a certain nugget-effect. In addition, the point-data are characterized by a Gaussian distribution. "Support"-data are characterized by a Gaussian distribution too, having the same mean and a smaller s. Due to this smaller s, the "support"-semivariogram is smaller then the point-semivariogram.
What about the nugget-effect of this "support"-variogram? Is it related to the nugget-effect of the point-variogram? What is this relationship, or were can I read more about it?

Pol Hermans

[Non-text portions of this message have been removed]
• ... At the risk of having my knuckles rapped again, this issue is explained clearly in Chapter 3 of Practical Geostatistics 1979 by Isobel Clark, which is
Message 1 of 2 , Dec 19 3:55 AM
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> What about the nugget-effect of this
> "support"-variogram? Is it related to the
> nugget-effect of the point-variogram? What is this
At the risk of having my knuckles rapped again, this
issue is explained clearly in Chapter 3 of Practical
Geostatistics 1979 by Isobel Clark, which is available
http://uk.geocities.com/drisobelclark/practica.html

It was put as a question to Andre Journel when I waas
learning my geostats in 1972. The nugget effect
reduces by pl/3 where p is the slope of the model
(spherical, linear, whatever) at short distances, l is
the length of the "support" (or area/volume if
necessary) and 3 is 3.0

Merry Christmas one and all
Isobel Clark

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