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## AI-GEOSTATS: Information about Kriging 3D and semivariogram in 3D

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• Hello to everybody, I have to build a semivariogram in 3D and I need to know if I can use the same concepts used for the 2D semivariogram or if the theory is
Message 1 of 3 , Nov 6, 2003
Hello to everybody,

I have to build a semivariogram in 3D and I need to know if I can use the same concepts used for the 2D semivariogram or if the theory is different. For example how can I consider the distance? In one article they said that I can first build the semivariogram in the horizontal direction in order to find the values of sill, range, nugget and the equation of the semivariogram. After this I can use these information to find the range in the vertical direction. Do you know any references that explain exactly how to do it?

Thank you very much.

Lisa

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• Lisa Distances and directions in 3d can be calculated very simply just as in 2d. There is shareware (Geostat Toolbox) and other software out there for 3d.
Message 2 of 3 , Nov 6, 2003
Lisa

Distances and directions in 3d can be calculated very
simply just as in 2d. There is shareware (Geostat
Toolbox) and other software out there for 3d.

Calculating semi-variograms whilst pretending your
data is two dimensional can lead to extremely
effect will be exaggerated out of all proportion to
reality.

At the risk of offending some of our more sensitive
list members, can I suggest you try things out on our
FREE teaching software PG2000 which includes 3d
capabilities. Test data set for this is a copper dump,
which is provided in the FREE downloadable data sets.
Find all this and other free goodies at
http://geoecosse.bizland.com/softwares

Isobel Clark

--- lisa pizzol <lisa_pizzol@...> wrote: >
> Hello to everybody,
>
>
>
> I have to build a semivariogram in 3D
> and I need to know if I can use the same concepts
> used for the 2D semivariogram or if the theory is
> different. For example how can I consider the
> distance? In one article they said that I can first
> build the semivariogram in the horizontal direction
> in order to find the values of sill, range, nugget
> and the equation of the semivariogram. After this I
> can use these information to find the range in the
> vertical direction. Do you know any references that
> explain exactly how to do it?
>
> Thank you very much.
>
>
> Lisa
>
>
>
> ---------------------------------
> Yahoo! Mail: 6MB di spazio gratuito, 30MB per i tuoi
> allegati, l'antivirus, il filtro Anti-spam

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• Hi Lisa, I would recommend that you look at Chapter 16 of Isaaks and Srivastava s book An introduction to Applied Geostatistics which offers a very nice
Message 3 of 3 , Nov 8, 2003
Hi Lisa,

I would recommend that you look at Chapter 16 of Isaaks and Srivastava's
book "An introduction to Applied Geostatistics" which offers a very nice
description of how to model semivariograms in different directions and
up to 3 dimensions. You can also refer to the following paper:
Barabas, N., Goovaerts, P. and P. Adriaens. 2001. Geostatistical
assessment and validation of uncertainty for three-dimensional dioxin data
from sediments in an estuarine river. Environmental Science & Technology,
35(16): 3294-3301.

Best regards,

Pierre Goovaerts

<><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><>

Dr. Pierre Goovaerts
President of PGeostat, LLC
Chief Scientist with Biomedware Inc.
710 Ridgemont Lane
Ann Arbor, Michigan, 48103-1535, U.S.A.

E-mail: goovaert@...
Phone: (734) 668-9900
Fax: (734) 668-7788
http://alumni.engin.umich.edu/~goovaert/

<><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><>

On Thu, 6 Nov 2003, [iso-8859-1] lisa pizzol wrote:

>
> Hello to everybody,
>
>
>
> I have to build a semivariogram in 3D and I need to know if I can use the same concepts used for the 2D semivariogram or if the theory is different. For example how can I consider the distance? In one article they said that I can first build the semivariogram in the horizontal direction in order to find the values of sill, range, nugget and the equation of the semivariogram. After this I can use these information to find the range in the vertical direction. Do you know any references that explain exactly how to do it?
>
> Thank you very much.
>
>
> Lisa
>
>
>
> ---------------------------------
> Yahoo! Mail: 6MB di spazio gratuito, 30MB per i tuoi allegati, l'antivirus, il filtro Anti-spam

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