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## Re: GEOSTATS: introduction/ question

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• Hi Jon, Indicator Kriging can work with as many classes as you want. At each grid node, it will give the probability for each class. You would then need to
Message 1 of 3 , Jul 24, 2000
Hi Jon,

Indicator Kriging can work with as many classes as you want. At each grid node, it

will give the probability for each class. You would then need to extract the most
probable
class for each node, if you are after a categorical model. For the same amount of
modeling
efforts, Sequential Indicator Simulation can give you the categorical model by
sequential
Monte-Carlo sampling from those local probabilyties.

Both algorithms require a variogram model for each class and both are available in
GSLIB.

Gilles

Heinz Burger wrote:

> Hello Jon,
>
> if you are not familiar with geometrical a n d geostatistical 3D-modelling
> then I would emphatically recommend to look for an alternative approach to
> your problem, i.e. correspondig to the scientific problem which you would like
> to
> analyse, e.g.
>
> 1. is it possible to reduce to 2D
> 2. can you transform classes of materials into hydro-geological relevant
> parameters (porosity, permeability or K-values) so that you can
> work with a single parameter in 3D space (which is difficult enough)
> 3.? etc
>
> If you want to get a picture of the subsurface only then the relation
> of scientific result/expenditure tends to zero.
>
> Regards,
>
> Heinz Burger
>
> Jon Jones schrieb:
>
> > Hello everyone,
> > I am a newbie to geostats (I have done a little stochastic work in
> > hydrogeology but not much else) community and I have a question for you
> > folks. I am interested in kriging a set of about 2100 borehole logs to
> > generate a 3D picture of the subsurface in a watershed. I have defined 19
> > separate classes of materials in the boreholes (sand, silt, gravel, etc.)
> > and am, at present, skipping making combinations of materials into a class
> > because I do not want to introduce any more uncertainty into the system (it
> > has enough already!). Anyway, I wanted to find an appropriate kriging
> > routine for this situation. The routine would only be allowed to use one of
> > the 19 defined classes for a value at any given point and can not
> > interpolate between defined classes. With this criteria in mind I chose
> > indicator kriging as the my desired method.
> >
> > Now here is my questions/problems.
> > 1) I would like to know if indicator kriging is the approach I should take.
> > 2) I have a copy of the book GSLIB (1st edition) which has an indicator
> > kriging routine in it but it is a 2-parameter routine. I am wondering if
> > anyone knows where I can get my hands on a n-parameter indicator kriging
> > routine (preferably for free because I am just a poor humble PhD student)?
> >
> > Thanks in advance for your help,
> >
> > Jon Paul Jones
> > University of Waterloo
> > Department of Earth Sciences
> > Waterloo, Ontario, Canada N2L-3G1
> > Phone: 519-888-4567 ext. 2984
> > Fax: 519-746-7484
> > "Just because you are paranoid does not mean that they are not all out to
> > get you."
> >
> > --
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> --
> *****************************************************
> Dr. Heinz Burger
> Freie Universitaet Berlin
> - Geoinformatik -
> Malteserstr. 74-100
> 12249 BERLIN, Germany
> Tel. (49) 30-838-70561 Fax: (49) 30-775-2075
> e-mail: hburger@...-berlin.de
> Web-Seite: http://userpage.fu-berlin.de/~hburger
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>
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Senior Geostatistician 9177 East Mineral Circle
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Phone: 303-749-7962 Englewood CO 80112
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