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Hello ai-geostats list-members
Performing an universal kriging on chemical data (log transform of
concentration), in some estimation points I obtained an estimation variance
larger (in some case three times) than the sill of residual variogram. From
what I know this is related to negative
Russell:
I have also been struggling trying to find references on
sampling, specifically sample size. The best two that I have found are
"Geostatistical Error Measurement" Myers (1997) and "Geostatistics for
Environmental Scientists" Webster and Oliver (2001). Webster and Oliver
(20
rs, please remember to post a summary of any useful
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, 13 de Novembro de 2003 8:46
To: ai-geostats
Subject: AI-GEOSTATS: Help needed
Is there someone in the list who could be so kind to help me in my
personal
odyssey in finding four pages of Journel and Huijbregts 'Mining
geostatistics'. I need Charts 4, 5, 14, 15 on pages 128-129 and 1
Paul Taylor
Sr. Reservoir Engineer
BP
- Original Message -
From: "sebastiano trevisani" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Thursday, November 20, 2003 3:21 PM
Subject: AI-GEOSTATS:
---
timate by separate.
- Original Message -
From: "Tomislav Malvić" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Wednesday, November 26, 2003 3:02 AM
Subject: AI-GEOSTATS: cross-validation
> Dear all,
>
> Question is about evaluation of cross-validation resul
service to the users, please remember to post a summary of any useful
responses to your questions.
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Subscrib
Title: RE: AI-GEOSTATS: Moran scatterplot
-Original Message-
From: Pat Bellamy
Sent: 28 November 2003 13:57
To: 'Monica Palaseanu-Lovejoy'
Subject: RE: AI-GEOSTATS: Moran scatterplot
Dear Monica
I think it would be worth looking at the following papers as it s
any useful
responses to your questions.
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nd it to [EMAIL PROTECTED]
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ai
dear list
I must generate a DEM using the TIN interpolator,
using geostatistical analyst extension of ArcGis software can I define the DEM
accurancy (raster output not only thr RMS error) like I do with the kriging
interpolator?
if it is not possible tell me a method to do
this,which softw
List Members:
Can anyone provide any insight or citations dealing with
interpolating ozone (or air pollutants in general) from monitoring station
data? Most of the citations that I have found will state “we used
this method” but are not very detailed, especially in reference to
infrequ
ehalf Of Isobel Clark
Sent: 06 February 2004 12:37
To: [EMAIL PROTECTED]
Subject: AI-GEOSTATS: Re: Rules
Dear Gregoire (and everyone else)
I did not consider my contribution to be an advert but
a public information notice.
Readers such as Michele Scardi who see this as cheap advertising,
attribu
e users, please remember to post a summary of any useful
responses to your questions.
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Dear List
Members,I am just writing a quick
mail to ask if anyone know a methodology to eliminate the flat area on a TIN
elevation model.
I have already used the insertion of a new elevation points in the flat
area the model is improved, but the results is not satisfactory,
can I do improve
simulation? Should I
> proceed in another way (v.g. Indicator simulation)?
>
> Thank you for any light shed on this question.
>
> --
> -------
> José Manuel Blanco Moreno
>
> Dept. de Biologia Vegetal (Botànica)
> Universitat de Barcelona
Hi list. The first
sorry about my english.
I have a beginner and basic question.
I want to analyze the semivariogram of rainfall
data in certain study area (i have about 71 data points).
I have also 200 data points of the surrounding
area that is not of my interest.
The question is: ¿coul
Hi list.
I have fitted the variogram of my data set but i'm
very unsure with the results.
I'm using arcinfo software to make the
geostatistical analysis.
The software fit automatically the variogram to the
data but i change this fitting manually in the way i think.
The software fitting is
>
To: <[EMAIL PROTECTED]>
Sent: Friday, February 20, 2004 7:23 AM
Subject: AI-GEOSTATS: polygon kriging
hello list,
i would like to assign the principles of block-kriging to user defined
(=irregular) polygons. some questions about it:
1. what do you think about this idea ?
2. is there an
lygons instead of regular blocks (problem: finding
> center [of gravity] for each irregular polygon and defining appropriate
> search neigbourhood !!) ?
>
> hope someone can help
>
> kind regards
>
> Lenz Dobler
>
> Universität Münster
> Institut für Geoinformatik
&
es anyone of you have practical experiences
> with this approach ?
> > 4. is there a realistic possibility to change
> existing gslib libraries to do
> > kriging with irregular polygons instead of regular
> blocks (problem: finding
> > center [of gravity] for each
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K
> Sent: Friday, February 27, 2004 8:27 AM
> To: '[EMAIL PROTECTED]'
> Subject: AI-GEOSTATS: spatial sampling
>
>
> Hello,
>
> Please help me settle an argument with my co-author (and if I'm
> wrong, I'll
> graciously admit it!).
>
> We
st a summary of any useful
responses to your questions.
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* Supp
Dear member
list
I used contour line and
few elevation points to generate a DEM, the first interpolator
that I used was been the TIN interpolator but the RMS was been not
very good, so I converted all nodes of the contour lines into elevation points
and I used them to produce many model ba
Dear List Members
I
have got 500.000 elevation points, whose derive by the vector numeric raw data
to points data transformation:
I
would like to use kriging interpolator, but I have three
problems:
-
c
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Hi,
I am attaching a pdf file which is a DD plot (mahalanobis distances
versus robust distances) for a heavy metal multivariate data. I am
not very sure about how i should interpret this particular graph.
Any help is greatly appreciated.
Monica
%PDF-1.1
%âãÏÓ
1 0 obj
<<
/CreationDate (D:2
ubject and "unsubscribe
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Bivand
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Breiviksveien 40, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 93 93
e-mail: [EMAIL PROTECTED]
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From:
Ines
To: [EMAIL PROTECTED]
Sent: Tuesday, March 16, 2004 10:22
AM
Subject: AI-GEOSTATS:
radial_basis-function
dear member list
the radial basis functions, like regularized
spline, spline with tension ., are local or global interpolator
method?
they
a
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dear
member list
I
must define the radius and the neighbourhood to interpolate elevation
points.
I defined
these two parameter using the follow two steps:
I have
defined the best neighbourhood in the area characterized by the
highest concentration of elevation points, I ha
he users, please remember to post a summary of any useful
responses to your questions.
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Subscribe/Unsubscribe
vaerts
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/
<><><><><><><>
Hi Guido,
As Pierre wrote, I have put some material on the web site of
AI-GEOSTATS:
1) Frequently Asked Questions (See FAQs)
2) Links to papers published online (mainly conference proceedings but I
linked only those I found of a good quality). You could also check
www.scirus.com : you will get
) if there is any way to get an electronic copy of his
book (out of print since a few years) or of the help file that I can put
on the ai-geostats web site. There is nothing else available now and it
is much needed. I think this is the best way to have an idea on what the
whole is about. The soft
ions.
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Hi,
I have just started learning this geostatistic and ArcGIS tool recently. I have the following problem to analyse for which I am looking for your help.
(1) I have four maps: (a) state route map- polylines shape file (arc) (b) state hiways map -polylines shape file (c) raster grid map of agri
Dear list,We have a small data set
(n<30), irregularly spaced, so, it is impossible toobtain good results
with the variograms analysis. We need to determine thedistance beyond which
there is no spatial correlation (the zone ofinfluence of each hole). Which
method we can use in this case?The
27;ecologie et de Paleoecologie
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Hi all,
I have a couple of questions for the
list.
I understand that most theoretical variograms are
fit by eye, and I was interested in
gauging the usefulness of automated (purely
data-driven) estimation for theoretical variograms.
i.e. Would it be useful to practitioners to be able
t;
>
>
> --
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> * As a general service to the users, please remember to post a summary of any useful
> responses to your questions.
> * To unsubscribe, send an email to [EMAIL PROTECTED] with no subject and
>
il 05, 2004 10:11
AMTo: [EMAIL PROTECTED]Subject: AI-GEOSTATS: Review
Papers
Looking for downloadable resent and old review papers
of geostatistics, and if it has something of history I will be really happy.
Regards
Adrian Martínez VargasDepartamento de
GeologíaFacult
Title: Message
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I have put the formula on the web
http://www.ai-geostats.org/igf.jpg
Gregoire
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Lampros Vasiliades
Sent: 15 April 2004 15:03
To: [EMAIL PROTECTED]
Subject: AI-GEOSTATS: IGF Formula
Could anyone give me the
Dear ALL:
From the literature of spatial regression, I found
"geographically weighted regeression" and "
spatial regression model(such as SAR,
CAR)"
I am confused what different between these two
concepts
Are they sloving the same problems, Or they are
not totally different issues?
Thank
Hello list,
I calculate variogram with my field data (21
quadrats in each plot). And I find that experimental variogram fluctuates
around a constant value and has very high nugget.
It may be due to the reason that the sample
interval is too big.
Are there any other reasons? Actually I
hi
i am facing problem to draw variogram for the limestone deposit. i have very positively skewed data set. earlier i had send one mail regarding this issue. and got suggession form Isobel Clarck ( she has told to deduct the every value from a large constant value and go for log of the result and
there any geostatistical process that can handle this?
>
> I have tried interpolating parameters caracterising different particle size
> distribution functions (in the case where there are more than 10 particule
> sizes) but this adds errors to the modelling and some parameters don't
&
'.
Isobel
http://geoecosse.bizland.com/BYOGeostats.htm
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* By using the ai-geostats mai
lized Pore-Size Distributions Using Min/Max Autocorrelation Factors. Mathematical Geology, Vol. 32, No. 8, 2000.
but I haven't found many statistical packages implementig this procedure.
What other possibilities are there?
Best regards,
Marc-Olivier
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Section, Department of Economics, Norwegian School of
Economics and Business Administration, Breiviksveien 40, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 93 93
e-mail: [EMAIL PROTECTED]
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To: [EMAIL PROTECTED]
Subject: [ai-geostats] thiessen polygons
Hi folks
Does anybody know of any packages available for computing Thiessen
polygons or Delaunay Triangulation in R?
Nick
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WWW: http://www.ai-geostats.org
WWW: http://rem.jrc.cec.eu.int
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Title: Kriging Small Blocks
All,
I just wondering why kriging small blocks is warned. Any literature about this subject will be appreciated.
Thanks.
Regards,
Jul
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oisCc:
[EMAIL PROTECTED]Subject: Re: [ai-geostats] Fractals &
SemivarianceNot sure how anisotropic "fractal"
spatial correlation models would fit in the whole scheme of things. You're
essentially assuming a power law model (Brownian motion) to model the spatial
corre
tudy Centre
Petroleum Development Oman-
POBox: 81, PC 113
Tel: (968) 674135; FAX: (968) 691470; Mobile: (968) 9898527
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dimension have any reasonable physical meaning?
Any experience with this?
Thanks again for the kind help.
Gregoire
-Original Message-
From: Syed Abdul Rahman Shibli [mailto:[EMAIL PROTECTED]
Sent: 16 July 2004 19:23
To: Gregoire Dubois
Cc: [EMAIL PROTECTED]
Subject: Re: [ai-geo
rsity of Science and Technology
Norway
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ulate them for every plot to compare plots.
This is the quick and easy approach to the problem I would use... but
who am I...
Good luck with your analysis,
Koen.
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ersus heterogeneity).
I hope this helps,
Monica
Monica Palaseanu-Lovejoy
University of Manchester
School of Geography
Mansfield Cooper Bld. 3.21
Oxford Road
Manchester M13 9PL
England, UK
Tel: +44 (0) 275 8689
Email: [EMAIL PROTECTED]
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Monica Palaseanu-Lovejoy
[mailto:[EMAIL PROTECTED]
Sent: Friday, August 06, 2004 12:23 PM
To: [EMAIL PROTECTED]; [EMAIL PROTECTED]
Subject: Re: [ai-geostats] Spatial analysis
Hi,
It is true that the general consensus is that you need at least 50 to
100 points for a stable semi-variogram, but myself i
My 2 cents contribution for the week ...
Cheers,
Gregoire
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analysis?
I should really appreciate anyone’s reply!
Thanks a lot ahead!
XiuhDo You Yahoo!?
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.
Thanks.
Syed
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Signoff ai
heir comparison case they used a large (n>2500)
> data set
> though.
>
> Anyone else who wants to shed light on this issue? Is there e.g. a minimum
> sample size above which both approaches become hard to distinguish?
> --
> Edzer
>
>
>
* By using the ai-geostats
riginal Message-
From: Mark Dowdall [mailto:[EMAIL PROTECTED]
Sent: 01 September 2004 10:02
To: [EMAIL PROTECTED]
Subject: [ai-geostats] XValid script
Hello
It may be cheeky, but I have two questions:
1. Where can I get I get the Surfer v7.0 script for crossvalidation? I
have been
PROTECTED]
Cc: [EMAIL PROTECTED]
Subject: RE: [ai-geostats] XValid script
Hi Mark,
1) At
http://www.ai-geostats.org/software/Codes_Softfaq.htm
you will find a few codes for Surfer. I have just added
crossvalidation.bas , a code I derived from Aleksey Amantov's
jacknife.bas You will need to c
(0)332 78 6360 Fax. +39 (0)332 78 5466 Email:
[EMAIL PROTECTED] WWW:
http://www.ai-geostats.org WWW: http://rem.jrc.cec.eu.int "The views expressed are purely those of the writer and may not in any
circumstances be regarded as stating an official position of the European
Commission."
*
ED]>
Sent: Thursday, September 02, 2004 3:30
PM
Subject: [ai-geostats] spatial
relationships
> Dear oh Dear, I am failing to communicate (again).> >
As far as I know, I didn't say you could not use> geostatistics when a
trend is present! I regularly use> Unive
6 Paris France
Tél.: 06 67 19 87 10
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Greetings,
I am coding some basic geostatistical estimators, including the
variogram, and would like to find some sample data sets for testing.
Can someone point me to any online datasets?
Thanks,
-Mark
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regg Easterbrook
George R Cutter wrote:
Dear ai-geostats Members,
Are there appropriate statistical tests for determining whether empirical
variograms are statistically different (maybe something akin to a
Kolmogorov-Smirnoff or chi-square test)?
Is there a test for comparing variogram model par
il: [EMAIL PROTECTED]
http://www.cranfield.ac.uk/nsri/
-Original Message-
From: George R Cutter [mailto:[EMAIL PROTECTED]
Sent: 15 October 2004 18:42
To: [EMAIL PROTECTED]
Subject: [ai-geostats] comparing variograms?
Dear ai-geostats Members,
Are there appropriate statistical tests for d
might be
some common causes of this problem?
Thanks in advance,
Best,
Dean Monroe
OSU Environmental Sciences
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conference proceeding I found a presentation that referred
to probability kriging. Could that be the answer to my question?
Thanks for the responses.
Dean Monroe
OSU Environmental Sciences
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start. We finish.* By using the ai-geostats mailing list you agree to follow its rules
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Signoff ai
TECTED]
> Sent: 03 November 2004 16:19
> To: [EMAIL PROTECTED]
> Subject: [ai-geostats] Understanding variograms
>
>
> Hi all,
> I'm new to the list, so bear with me :)
> I'm trying to carry out some kriging of some (x,y,v)
> data set on to a
> regular grid
215-7173;Cell: (832)465-3311
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esday, December 07, 2004 4:50 PM
To: [EMAIL PROTECTED]
Subject: [ai-geostats] variogram analysis
My question is general. What do you conclude if your variogram is
wavy? Cyclic patterns? I have what appears to be high nugget,
followed by a wavy pattern.
If you wish, here is more info: an offshore p
Fax 770-421-3486
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-Original Message-
From: Rajive Ganguli [mailto:[EMAIL PROTECTED]
Sent: Tuesday, December 07, 2004 4:50 PM
To: [EMAIL PROTECTED]
Subject: [ai-geostats] variogram analysis
My question is general. What do you conclude if your var
GloverSenior Environmental Scientist - Geochemistry Geoenvironmental DepartmentMACTEC Engineering and Consulting, Inc.Kennesaw, Georgia, USAOffice 770-421-3310Fax 770-421-3486Email [EMAIL PROTECTED] Web www.mactec.com-Original Message-From: Rajive Ganguli [mailto:[EMAIL PROTECTED] Sent: Tuesday, Dece
zones are economic you
may want to seperate them out and model them seperately.
Digby
www.users.on.net/~digbym
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them.
Isobel
http://uk.geocities.com/drisobelclark/practica.htm
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rom a variogram by
r(h) = (C0-gamma(h))/C0
with C0 the sill of the variogram and gamma(h) the
semivariance (model) value.
--
Edzer
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ropping with distance. This suggests that
> you also have some underlying trend (non-stationarity)
> which is causing closely spaced samples to be 'more
> different' than those further apart.
>
> I notice you are using a log transform. What does your
> probability plot look
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