|\/|Pierre Goovaerts
|_\ /_|Assistant professor
__|\/|__Dept of Civil Environmental Engineering
|| The University of Michigan
| M I C H I G A N| EWRE Building, Room 117
|| Ann Arbor
be worth a fortune..
|\/|Pierre Goovaerts
|_\ /_|Assistant professor
__|\/|__Dept of Civil Environmental Engineering
|| The University of Michigan
| M I C H I G A N| EWRE
confused by this exchange of e-mails... I don't have
a book, a software or a consulting company to advertise!
Cheers,
Pierre
|\/|Pierre Goovaerts
|_\ /_|Assistant professor
__|\/|__Dept of Civil
the lag at which the second rise occurs, I wouldn't
bother modeling it.
Pierre
|\/|Pierre Goovaerts
|_\ /_|Assistant professor
__|\/|__Dept of Civil Environmental Engineering
geostatistics
or the recent book by Chiles and Delfiner.
Pierre
|\/|Pierre Goovaerts
|_\ /_|Assistant professor
__|\/|__Dept of Civil Environmental Engineering
|| The University
is not larger than say 0.1,
I would fit the model to the
experimental values and then rescale the
fitted sills so that they sum to 1 for use
in the simulation program.
Pierre
|\/|Pierre Goovaerts
|_\ /_|Assistant professor
.
Now, you didn't explain which secondary information was used
for cokriging and how many neighboring values were used
in the different interpolators.
Regards,
Pierre Goovaerts
Dr. Pierre Goovaerts
Consultant in (Geo)statistics
and Senior Chief Scientist with Biomedware Inc.
710 Ridgemont Lane
Ann
Hi Carolina,
You can not fit any type of curve to
your experimental variograms since the model
needs to be permissible, hence the practice
to fit only a limited number of models
that are known to be permissible.
Pierre
Dr. Pierre Goovaerts
Consultant in (Geo)statistics
and Senior Chief
Hi Ruben,
I am also working on Windows XP and have
repeated your experiment. I can read the file created
from Excel (option formatted text, space delimited)
with prevar2D and then run Vario2D without any problem.
Pierre
Dr. Pierre Goovaerts
Consultant in (Geo)statistics
President of PGeostat
techniques, you will get
similar results.
Regards,
Pierre Goovaerts
Dr. Pierre Goovaerts
Consultant in (Geo)statistics
President of PGeostat, LLC
and Senior Chief Scientist with Biomedware Inc.
710 Ridgemont Lane
Ann Arbor, Michigan, 48103-1535, U.S.A.
E-mail: [EMAIL PROTECTED]
Phone: (734) 668
end up getting better
re-estimation results for the smooth map.
KED could be performed using the program kt3d in Gslib.
Hope it helps,
Pierre
Dr. Pierre Goovaerts
Consultant in (Geo)statistics
President of PGeostat, LLC
and Senior Chief Scientist with Biomedware Inc.
710 Ridgemont Lane
Ann Arbor
to relative nugget effect which is
inferred from the vertical axis of the semivariogram.
This comment is purely empirical and is not backed up
by any theory. Also I wouldn't draw any conclusion
from a statistics computed on 9 observations.
Cheers,
Pierre
Dr. Pierre Goovaerts
Consultant in (Geo
, then apply indicator kriging to derive
the local distributions of probability the mean of
which can be used for estimation.
Note that in presence of a large proportion of zeros
(say more than 90%) your indicator variogram will
more likely still look erratic.
Pierre
Dr. Pierre Goovaerts
Consultant in (Geo
(e.g. negative concentration estimates).
Pierre
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: [EMAIL PROTECTED]
Phone: (734) 668-9900
Fax: (734) 668-7788
http://alumni.engin.umich.edu
.
Cheers,
Pierre
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: [EMAIL PROTECTED]
Phone: (734) 668-9900
Fax: (734) 668-7788
http://alumni.engin.umich.edu/~goovaert/
On Tue, 11 Feb
concentrations?
Cheers,
Pierre
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: [EMAIL PROTECTED]
Phone: (734) 668-9900
Fax: (734) 668-7788
http://alumni.engin.umich.edu/~goovaert/
On Tue
: 3-26.
and would be glad to send you a PDF copy of the paper if needed.
Regards,
Pierre
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: [EMAIL PROTECTED]
Phone: (734) 668-9900
Fax
Hi Lorenz,
As long as the mean is known and assumed constant
across the study area, you can apply simple kriging.
There is no need for that mean to be zero.
Cheers,
Pierre
Dr. Pierre Goovaerts
President of PGeostat, LLC
Chief Scientist with Biomedware Inc.
710 Ridgemont Lane
Ann Arbor
,
Pierre
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: [EMAIL PROTECTED]
Phone: (734) 668-9900
Fax: (734) 668-7788
http://alumni.engin.umich.edu/~goovaert/
On Fri, 7 Mar 2003, Dave
the range of correlation, they still receive
non zero kriging weights in ordinary kriging.
Hope it helps
Pierre
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: [EMAIL PROTECTED]
Phone: (734
is significant, and for
this the Moran I would be better suited since expressions exist
to compute confidence intervals.
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
-Hernandez, and R. Froidevaux,
editors, geoENV II - Geostatistics for Environmental Applications.
Kluwer Academic Publishers, Dordrecht, pages 405-416.
Regards,
Pierre
Dr. Pierre Goovaerts
President of PGeostat, LLC
Chief Scientist with Biomedware Inc.
710 Ridgemont Lane
Ann Arbor, Michigan
Hello,
You may want to visit Jan-Willem van Groenigen webpage
agronomy.ucdavis.edu/groenigen/ where you can download
Sanos software that implements the constrained optimization
of spatial sampling he developed in his Ph.D.
Cheers,
Pierre
Dr. Pierre Goovaerts
President of PGeostat, LLC
Chief
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: [EMAIL PROTECTED]
Phone: (734) 668-9900
Fax: (734) 668-7788
http://alumni.engin.umich.edu/~goovaert/
On Mon, 9 Jun 2003, Joe
.
For example, only a random subset of these 6,560 possible lags
would be reproduced. This is a limitation of the simulated annealing
algorithm (would be even worst in 3D) and any other suggestions
would be much appreciated.
Regards,
Pierre Goovaerts
Dr. Pierre Goovaerts
President of PGeostat, LLC
,
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: [EMAIL PROTECTED]
Phone: (734) 668-9900
Fax: (734) 668-7788
http://alumni.engin.umich.edu/~goovaert/
On Sat, 5 Jul 2003
questionable.
The best way to proceed would be to do some cross validation
using various search strategies and investigate their impact
on re-estimation scores.
Regards,
Pierre Goovaerts
Dr. Pierre Goovaerts
President of PGeostat, LLC
Chief Scientist with Biomedware Inc.
710 Ridgemont Lane
Ann Arbor
and deviations from these targets should be allowed.
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: [EMAIL PROTECTED]
Phone: (734) 668-9900
Fax: (734) 668
semivariance profiles sampled along specific directions.
Again this paper is nicely written and discusses methodological issues
related to 2-dimensional fractal analysis.
Cheers,
Pierre
Dr. Pierre Goovaerts
President of PGeostat, LLC
Chief Scientist with Biomedware Inc.
710 Ridgemont Lane
Ann
and secondary
data weights must sum to one (referred to as standardized
cokriging in Gslib software). This issue is discussed in my book
and in the following publication:
Goovaerts, P. 1998. Ordinary cokriging revisited.
Mathematical Geology, 30(1): 21-42.
Cheers,
Pierre
Dr. Pierre Goovaerts
President
SGS using Gslib, there is a built-in
normal score transform and back-transform in the program, which is
more flexible than the lognormal transform.
Cheers,
Pierre
Dr. Pierre Goovaerts
President of PGeostat, LLC
Chief Scientist with Biomedware Inc.
710 Ridgemont Lane
Ann Arbor, Michigan, 48103
., 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
,
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: [EMAIL PROTECTED]
Phone: (734) 668-9900
Fax: (734) 668-7788
http://alumni.engin.umich.edu/~goovaert/
On Thu, 20 Nov
not find a parameter file in
the directory where you are running the program, it will automatically
create a default one that you should modify before running
the program again.
Happy holidays!
Pierre
Dr. Pierre Goovaerts
President of PGeostat, LLC
Chief Scientist with Biomedware Inc.
710
a few values or if there is
a large proportion of data below the detection limit or equal to zero,
a normal score transform that artificially despikes these similar
values might not be the most appropriate approach.
Pierre Goovaerts
Dr. Pierre Goovaerts
President of PGeostat, LLC
Chief
of
the polygon, and read this grid at the beginning of the simulation).
Best regards,
Pierre
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: [EMAIL PROTECTED]
Phone: (734) 668-9900
Fax
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: [EMAIL PROTECTED]
Phone: (734) 668-9900
Fax: (734) 668-7788
http://alumni.engin.umich.edu/~goovaert/
On Sun, 7 Mar 2004, Steven Rogers
, this covariance model
could lead to very small correlations off the two main axes of anisotropy,
which could explain the larger kriging variance observed along the
diagonal directions.
Pierre
Dr. Pierre Goovaerts
President of PGeostat, LLC
Chief Scientist with Biomedware Inc.
710 Ridgemont Lane
Ann Arbor
in cokriging and I looked
also at ways to interpret the shape of these graphs.
I believe you have should have mentioned the objectives of your
analysis in your initial email, I bet you don't compute cross
semivariograms for the pleasure...
Pierre
Dr. Pierre Goovaerts
President of PGeostat, LLC
webpage:
Saito, H. and P. Goovaerts. 2000. Geostatistical interpolation of
positively skewed and censored data in a dioxin contaminated site.
Environmental Science Technology, vol.34, No.19: 4228-4235.
Regards,
Pierre
Dr. Pierre Goovaerts
President of PGeostat, LLC
Chief Scientist
a curve to
experimental values. It aims at creating a model for the spatial
variability of the phenomenon under study and it relies greatly
on ancillary information (e.g. magnitude of nugget effect, directions of
anisotropy) typically provided by expert knowledge.
Pierre
Dr. Pierre Goovaerts
compositional kriging to interpolate class
memberships, and they have incorporated additional constraints into
the kriging system to ensure that all estimates are positive
and add up to a constant (1 in this case).
Cheers,
Pierre Goovaerts
Dr. Pierre Goovaerts
President of PGeostat, LLC
Chief Scientist
for the trend and use geostatistics to
interpolate the residuals, provided there is some spatial
correlation left.
Cheers,
Pierre
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: [EMAIL PROTECTED
Hi Sanghoon,
Your maps look fine and would reflect a strong anisotropy.
What is the anisotropy ratio for your variables and did you
select a circular or ellptical search window?
Pierre
Dr. Pierre Goovaerts
President of PGeostat, LLC
Chief Scientist with Biomedware Inc.
710 Ridgemont Lane
Ann
application in the field of design of
network of environmental sensors and I am open to collaborations
on this topic.
Regards,
Pierre
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: [EMAIL
in general) at the last geostat congress in
Banff, but since I only caught the last part of his presentation I
might be wrong.
Pierre
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: [EMAIL
Hi Wolfram,
You forgot to mention what you want to do with these data.
If the objective is to perform kriging, then you can use
either kriging with nonsystematic errors or soft
indicator kriging to account for the variable level of
reliability of your data.
Cheers,
Pierre
Dr. Pierre
during the last GeoEnv conference
and I put a PDF copy of the paper, which is in press for
the moment, on my website.
Cheers,
Pierre
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: [EMAIL
, sequential
indicator simulation is available only with the SK option, which
might indicate some problems with the OK option...
Hope it helps,
Pierre
Dr. Pierre Goovaerts
President of PGeostat, LLC
Chief Scientist with Biomedware Inc.
710 Ridgemont Lane
Ann Arbor, Michigan, 48103-1535, U.S.A.
E
is ostropic.
Pierre
Pierre Goovaerts
Chief Scientist at Biomedware
516 North State Street
Ann Arbor, MI 48104
Voice: (734) 913-1098
Fax: (734) 913-2201
http://home.comcast.net/~goovaerts/
-Original Message-
From: Darla Munroe [mailto:[EMAIL PROTECTED]
Sent
/accuracy_arsenic.pdf
and look at the kriging system (5). I have another publication under
review for Water Resources Research but the turn over is so slow that it might
not
get published before the end of this year.
Regards,
Pierre Goovaerts
Chief Scientist at Biomedware
516 North State Street
Hi Els,
You should expect the directions of anisotropy to be fairly similar
if the two attributes are reasonably correlated. Except if you use a linear
model of coregionalization, there is no requirement for the directions
of anisotropy or the anisotropy ratio to be the same.
Pierre
Pierre
Well, as the author of the green bible I guess I should help out a little bit
here...
The key idea is that there exists an analytical expression that allows you to
compute a priori, for any threshold of a multigaussian random function,
the indicator semivariogram models. You only need to know
Hi Els,
The key question here is the sampling density and how many data will
be included in this search window. If there are many, the screening effect
will greatly attenuate the impact of the data further away, hence using a or
3a won't make a big difference. If data are sparser, then usually I
Hi Gregoire,
I agree with you regarding the merits of the standardized semivariogram as
implemented
in variowin software. In one of my last studies, the rescaling by the lag
variance helped
correcting the preferential sampling of wells with high arsenic levels, leading
to a
susbtantial
Hello,
Implementation of the maximum likelihood allocation (pick up the class
with the maximum probability of occurrence) is easy to implement,
starting with any Excel spread sheet.
Soares algorithms is much less straigthforward to code and I should be
able to exhume a Fortran program I wrote
you can download
from my webpage, in addition to a paper that has just been published in Remote
Sensing of the Environment and that I would gladly send you in a PDF format.
Cheers,
Pierre
Pierre Goovaerts
Chief Scientist at Biomedware
516 North State Street
Ann Arbor, MI 48104
Voice
Hi Simone... one way to look at it is to call Z(x) the tail variable and Z(x+h)
the head variable.
These are two variables describing the relative position in space of values of
the same physical
attribute. Then, you have your 2 variables to compute the covariance fuction
for a given vector
Hi,
Just perform the new coding outside Gslib. Excel should do it.
Pierre
-Original Message-
From: gianni [mailto:[EMAIL PROTECTED]
Sent: Wed 5/4/2005 6:06 AM
To: ai-geostats@unil.ch
Cc:
Subject: [ai-geostats] gslib and simulations
Hi,
You could try using kriging with non-systematic error where you can directly
incorporate
information on the reliability of your data in the kriging system. The
technique is
described in Chiles and Delfiner's textbook.
Pierre
-Original Message-
From: Jose Luis
are available for this
trend modeling.
The only limitation is that the trend is modeled globally (i.e. the regression
coefficients are constant
in space) while in KED the coefficients are reestimated within each search
window.
Cheers,
Pierre
Pierre Goovaerts
Chief Scientist at Biomedware
516 North
,
Pierre
Pierre Goovaerts
Chief Scientist at Biomedware
516 North State Street
Ann Arbor, MI 48104
Voice: (734) 913-1098
Fax: (734) 913-2201
http://home.comcast.net/~goovaerts/
-Original Message-
From: Norm, Ellen, Kathy Emily [mailto:[EMAIL PROTECTED]
Sent
Hi Pete,
This is a classical example where stochastic simulation would allow an easy
quantification
of the uncertainty attached to the aggregated value. Just generate a series of
realizations
of your process over these 1700 points, sum each set of simulated values, and
use the empirical
Hi,
In fact, as long as the weights are all positive and sum up to one, your
interpolated probability
will always be between 0 and 1; so you should be all right..
The approach proposed by Sebastiano is similar to median indicator kriging in
the sense
that the weights assigned to the
apply indicators
to continuous or categorical variables.
Pierre
Pierre Goovaerts
Chief Scientist at Biomedware
516 North State Street
Ann Arbor, MI 48104
Voice: (734) 913-1098
Fax: (734) 913-2201
http://home.comcast.net/~goovaerts/
-Original Message-
From: Koen Hufkens [mailto
it
is accepted, which should be very soon.
Regards,
Pierre
Pierre Goovaerts
Chief Scientist at Biomedware
516 North State Street
Ann Arbor, MI 48104
Voice: (734) 913-1098
Fax: (734) 913-2201
http://home.comcast.net/~goovaerts/
-Original Message-
From: Schlatter Christian [mailto:[EMAIL
Hi Digby,
The variance of a sum of random variables is not equal to the sum of their
variances, except if they are independent.. Consequently, the kriging variances
cannot be simply combined to compute the variance of the global estimator, see
Mining Geostatistics, Page 323 (Journel and
.
Mathematical Geology, 37(6), 587-613.
You can download the PDF of the paper from the my webpage:
http://home.comcast.net/~goovaerts/publication.html
Cheers,
Pierre
===
Pierre Goovaerts
Chief Scientist at Biomedware
516 North State Street
Ann Arbor, MI 48104
Voice
the variance of primary and secondary variables increases.
The different types of cokriging are described and compared in the
following paper:
Goovaerts, P. 1998. Ordinary cokriging revisited.
Mathematical Geology, 30(1): 21-42.
Cheers,
Pierre
Pierre Goovaerts
Chief Scientist at BioMedware
516
is a good way to compare the prediction performances
of the different estimators.
Pierre
Pierre Goovaerts
Chief Scientist at BioMedware
516 North State Street
Ann Arbor, MI 48104
Voice: (734) 913-1098 (ext. 8)
Fax: (734) 913-2201
http://home.comcast.net/~goovaerts/
-Original Message-
From
are acceptable, albeit confusing. The
use of the term factorial does not systematically imply a multivariate
analysis and a factor does not need to be a linear combination of variables.
Hope it helps,
Pierre
Pierre Goovaerts
Chief Scientist at BioMedware
516 North State Street
Ann Arbor, MI 48104
Hello,
I used Compaq Visual Fortran and didn't have any problem compiling the program.
Pierre
Pierre Goovaerts
Chief Scientist at BioMedware
516 North State Street
Ann Arbor, MI 48104
Voice: (734) 913-1098 (ext. 8)
Fax: (734) 913-2201
http://home.comcast.net/~goovaerts
Pierre Goovaerts
Chief Scientist at BioMedware
516 North State Street
Ann Arbor, MI 48104
Voice: (734) 913-1098 (ext. 8)
Fax: (734) 913-2201
http://home.comcast.net/~goovaerts/
From: Hohner, Susan [mailto:[EMAIL PROTECTED]
Sent: Tue 2/28/2006 1:28 PM
To: AI
Hi,
They are currently writing a book that would be similar to Gslib user manual
but tailored to S-GeMS features. In the meantime, you can find some
help in the user manual available at
http://sgems.sourceforge.net/doc/sgems_manual.pdf
Cheers,
Pierre
Pierre Goovaerts
Chief Scientist
, and you
can choose among power, exponential and hyperbolic models
for the lower and upper tail extrapolation).
Cheers,
Pierre
Pierre Goovaerts
Chief Scientist at BioMedware
516 North State Street
Ann Arbor, MI 48104
Voice: (734) 913-1098 (ext. 8)
Fax: (734) 913-2201
http://home.comcast.net
measurement errors
(variability at the sampled locations) which you might want to filter, or
whether it
represents small-scale variability in the field.
Note that the discontinuities in the map will disappear if you use a simulation
method.
Hope it helps,
Pierre
Pierre Goovaerts
Chief Scientist
the interpolated node does not coincide with a sampled location,
the nugget variance is filtered. So, I don't see how you could compare
the common kriging with factorial kriging in a cross-validation mode.
Regards,
Pierre
Pierre Goovaerts
Chief Scientist at BioMedware
516 North State Street
Ann
for the category that is observed on the
ground.
Indicator residuals are computed by subtracting these two vectors.
SIS with varying local means is implemented in Gslib program sisim.
Cheers,
Pierre
Pierre Goovaerts
Chief Scientist at BioMedware Inc.
Courtesy Associate Professor, University
,
i.e. the secondary variogram has a smaller nugget effect.. See the example in
my book
pages 219-220.
Cheers,
Pierre
Pierre Goovaerts
Chief Scientist at BioMedware Inc.
Courtesy Associate Professor, University of Florida
President of PGeostat LLC
Office address:
516 North State Street
,
Pierre
Pierre Goovaerts
Chief Scientist at BioMedware Inc.
Courtesy Associate Professor, University of Florida
President of PGeostat LLC
Office address:
516 North State Street
Ann Arbor, MI 48104
Voice: (734) 913-1098 (ext. 8)
Fax: (734) 913-2201
http://home.comcast.net/~goovaerts
Geostatistics
page 451 for the smoothing relations that link the average kriging variance
to the
variance of observations and the variance of kriging estimates.
Pierre
Pierre Goovaerts
Chief Scientist at BioMedware Inc.
Courtesy Associate Professor, University of Florida
President of PGeostat LLC
.
Superimposing the variograms computed from different interpolated maps
would allow a quick visual comparison of the degree of smoothness of the
different maps.
Pierre
Pierre Goovaerts
Chief Scientist at BioMedware Inc.
Courtesy Associate Professor, University of Florida
President of PGeostat
modeling of facies data. SPE Journal, 1(1): 21-29.
If you want to avoid the smoothing effect and reproduce target proportions
for the different facies, you may want to use stochastic simulation
as described in the aforementioned papers.
Pierre
Pierre Goovaerts
Chief Scientist at BioMedware Inc
will then be the arithmetical average of your observations and the
standard
error will be provided by the kriging standard deviation.
Cheers,
Pierre
Pierre Goovaerts
Chief Scientist at BioMedware Inc.
Courtesy Associate Professor, University of Florida
President of PGeostat LLC
Office address:
516
Association of Petroleum
Geologists... and I could send you a copy if you are interested...
An executable to compute the accuracy plot can be downloaded from:
http://ekofisk.stanford.edu/SCRFweb/GSLIB/added.html
Cheers,
Pierre
Pierre Goovaerts
Chief Scientist at BioMedware Inc.
Courtesy
.
Regards,
Pierre
Pierre Goovaerts
Chief Scientist at BioMedware Inc.
Courtesy Associate Professor, University of Florida
President of PGeostat LLC
Office address:
516 North State Street
Ann Arbor, MI 48104
Voice: (734) 913-1098 (ext. 8)
Fax: (734) 913-2201
http://home.comcast.net/~goovaerts
. A. 2002. FACOTR2D: a computer program for
factorial cokriging. Comput. Geosci. 28, 8 (Oct. 2002), 857-873. DOI=
http://dx.doi.org/10.1016/S0098-3004(02)3-1
http://dx.doi.org/10.1016/S0098-3004(02)3-1
Pierre
Pierre Goovaerts
Chief Scientist at BioMedware Inc.
Courtesy Associate Professor
or factors, hence I never bother attempting to backtransform them.
Hope it helps,
Pierre
Pierre Goovaerts
Chief Scientist at BioMedware Inc.
Courtesy Associate Professor, University of Florida
President of PGeostat LLC
Office address:
516 North State Street
Ann Arbor, MI 48104
Voice: (734) 913
have a look
at the parameter file.
Pierre
Pierre Goovaerts
Chief Scientist at BioMedware Inc.
Courtesy Associate Professor, University of Florida
President of PGeostat LLC
Office address:
516 North State Street
Ann Arbor, MI 48104
Voice: (734) 913-1098 (ext. 8)
Fax: (734) 913-2201
http
to the weighted sum of secondary data.
Hope it helps
Pierre
Pierre Goovaerts
Chief Scientist at BioMedware Inc.
Courtesy Associate Professor, University of Florida
President of PGeostat LLC
Office address:
516 North State Street
Ann Arbor, MI 48104
Voice: (734) 913-1098 (ext. 8)
Fax: (734) 913
distributions in the original space.
Cheers,
Pierre
Pierre Goovaerts
Chief Scientist at BioMedware Inc.
Courtesy Associate Professor, University of Florida
President of PGeostat LLC
Office address:
516 North State Street
Ann Arbor, MI 48104
Voice: (734) 913-1098 (ext. 8)
Fax: (734) 913-2201
All the Gslib source codes + online help menus
+ additional files for cosimulation/accuracy plot can be downloaded
from http://pangea.stanford.edu/ERE/research/scrf/software/
Cheers,
Pierre
Pierre Goovaerts
Chief Scientist at BioMedware Inc.
Courtesy Associate Professor, University
I think that Isobel refers to the implementation of the kriging algorithm in
ESRI
products where the nugget variability is automatically filtered from the
data. Hence,
if your variogram has a non-zero nugget effect, the kriged surface won't
honor the data
at sampled locations.
Pierre
Pierre
responses to your questions.
+ Support to the forum can be found at http://www.ai-geostats.org/
--
Pierre Goovaerts
Chief Scientist at BioMedware Inc.
516 North State Street
Ann Arbor, MI 48104
Voice: (734) 913-1098 (ext. 8)
Fax: (734) 913-2201
Courtesy Associate Professor, University of Florida
well Isobel explained how to go from Gaussian to uniform...
On Tue, Nov 17, 2009 at 1:59 PM, Anatoly Saveliev s...@ksu.ru wrote:
Pierre Goovaerts :
For once, I agree with Isobel.
sGs is the way to go...
sGs - Gaussian by definition; he wants uniform :-)
Anatoly Saveliev
Pierre
://www.ai-geostats.org/
--
Pierre Goovaerts
Chief Scientist at BioMedware Inc.
3526 W Liberty, Suite 100
Ann Arbor, MI 48103
Voice: (734) 913-1098 (ext. 202)
Fax: (734) 913-2201
Courtesy Associate Professor, University of Florida
Associate Editor, Mathematical Geosciences
Geostatistician, Computer
10 Bandung 40132 INDONESIA
http://www.mining.itb.ac.id/heriawan
--
*From:* Pierre Goovaerts goovae...@terraseer.com
*To:* seba sebastiano.trevis...@libero.it
*Cc:* José M. Blanco Moreno jmbla...@ub.edu; ai-geostats@jrc.it
*Sent:* Tue, February 2, 2010 12:27:09 AM
for their use.
Bye
Sebas
--
Pierre Goovaerts
Chief Scientist at BioMedware Inc.
3526 W Liberty, Suite 100
Ann Arbor, MI 48103
Voice: (734) 913-1098 (ext. 202)
Fax: (734) 913-2201
Courtesy Associate Professor, University of Florida
Associate Editor, Mathematical Geosciences
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