FYI
Gregoire
From: Jaime Gomez [mailto:jgo...@upv.es]
Sent: Wednesday, January 04, 2012 5:27 PM
To: gregoire.dub...@jrc.it
Subject: [geoENV2012] Call for abstracts
Dear Colleague,
The IX Conference on Geostatistics for Environmental Applications will be
held in Valencia
Dear all,
Given the very low traffic on the mailing list and the fact that I do not
have the time to maintain/update the information regarding conferences,
courses, freeware and jobs announcements, I will allow from now on the
posting of such mails.
Postings falling under these categories
17, 2010 3:27 AM
To: Gregoire Dubois
Subject: Re:RE: help ai-geostats
Hello Dubois,
the software is spatial scaling depicted in the http://www.ai-geostats.
org/bin/view/AI_GEOSTATS/SWSpatial, or I can say it is a software for scale
variance analysis, I can't open the links, it said
Hi everyone,
Any suggestions about how to map probabilities to find undetected mining
sites having only
- A map of mining locations (presence only data)
- A geological map
- A DEM
Im aware of the work on mapping bird species (e.g. Olivier Wotherspoon,
Hi everyone,
Most have you have already noticed the migration of AI-GEOSTATS.ORG to a new
host and wondered about it. After 16 years of managing the web site, it was
the right time to hand it over to someone else willing to give to it a new
home and new ideas. Edzer is definitely a right
May I remind everyone the first rule of AI-GEOSTATS when posting something to
the list?
As requested by the subscribers, announcements of courses, conferences,
software freeware and jobs are NOT supposed to be sent to the list. You
should instead use the respective online forms or contact me.
Hi everyone,
Does anyone know where Variowin can be downloaded? The original link
(http://www-sst.unil.ch/research/variowin/index.html ) is dead I'm afraid.
Best regards
Gregoire (moderator of ai-geostats)
Gregoire Dubois (PhD)
DG Joint Research Centre
Ciao Sebastiano,
I did work a bit on the issue with Peter (I guess he will get back to
you with even more references) and found the following papers useful:
Bruno, R., Raspa, G., 1989. Geostatistical characterization of
fractal models of surfaces. In: Armstrong, M. (Ed.),
Geostatistics. Kluwer
http://www.ebooksz.cn/2009/02/geostatistics-for-environmental.html
Best regards
Gregoire
PS: I hope this message will not arrive 3 times to you
Gregoire Dubois (PhD)
DG Joint Research Centre - European Commission
Institute for Environment and Sustainability
Global
-Original Message-
From: Lena Szymanek [mailto:l...@mir.gdynia.pl]
Sent: Monday, February 09, 2009 3:18 PM
To: Gregoire DUBOIS (European Commission)
Subject: Re: AI-GEOSTATS: Free downloadable geostats book
Dear Gregoire,
I think this is not a legal way to get this book, unless the authors
growing and we are today more than 600
subscribers.
I wish you all a happy new year 2009 and hope to see you in June on the
Milos Island.
Kind regards
Gregoire (moderator of ai-geostats)
Gregoire Dubois (PhD)
DG Joint Research Centre - European Commission
Two words from the moderator of the list to stop this discussion.
In summary: AI-GEOSTATS was definitely not the best place for the GLCM
posting and Monica was trying to be helpful indeed.
In the case of doubts when posting a mail to the list, please (re)read the
rules on www.ai-geostats.org
Please note that job announcements are not supposed to be sent to the
list. Job announcements should be sent to me instead and I will add
these on ai-geostats.org unless these have nothing to do with spatial
statistics.
Many thanks for your collaboration.
Best regards
Gregoire (owner of
replies and sorry for my late feedback (I'm
currently moving office)
Best regards,
Gregoire
__
Gregoire Dubois (Ph.D.)
European Commission (EC)
Joint Research Centre (DG JRC)
WWW: http://rem.jrc.cec.eu.int/
The views expressed are purely those of the writer
Dear list,
Having fit a variogram to a dataset (indoor radon measurements) and
applied cross-validations, I noticed the perfect negative correlation
(-0.95) between my kriging residuals and my input data.
This means that I am overestimating as much the low values as I am
underestimating the
the same definition as above (i.e. residuals =
estimate - observed).
Many thanks again for your kind feedback!
Gregoire
__
Gregoire Dubois (Ph.D.)
European Commission (EC)
Joint Research Centre (DG JRC)
WWW: http://rem.jrc.cec.eu.int/
The views expressed
this routine I will
be pleased to receive it from you.
I sent an email to the author of cosim code but it does not work.
Sincerly Yours
MOUKANA
From: Gregoire Dubois [EMAIL PROTECTED]
Reply-To: [EMAIL PROTECTED]
To: 'Jean Jerselth Aurelien LEBONGUI MOUKANA'
[EMAIL PROTECTED]
Subject
feedback and thoughts.
Have a nice w-e
Gregoire
__
Gregoire Dubois (Ph.D.)
European Commission (EC)
Joint Research Centre Directorate (DG JRC)
Institute for Environment and Sustainability (IES)
TP 441, Via Fermi 1
21020 Ispra (VA)
ITALY
Tel. +39 (0)332
There is a magic web site called AI-GEOSTATS.ORG
You would find there (search GSLIB in the software section) a link to
http://www.gslib.com/
f77 f90 source codes can downloaded freely (a form must be filled in)
Hope this helps
Gregoire
On 2/21/07, Samuel Verstraete [EMAIL PROTECTED] wrote:
Dear list,
I found out today by chance that the proceedings of the workshop held
this year in Foggia and Baia delle Zagare (Puglia , Italy), are
available online at http://old.unifg.it/spatial/proceedings.asp
You will find there many interesting papers in many different fields.
Enjoy!
I
be interested to learn more about the relative advantages and drawbacks
of these methods. Any hints?
Many thanks in advance,
Gregoire
__
Gregoire Dubois (Ph.D.)
European Commission (EC)
Joint Research Centre Directorate (DG JRC)
Institute for Environment
-geostats community, please send it to me a.s.a.p. I hope to have something available early November.
Kind regards,
Gregoire
__
Gregoire Dubois (Ph.D.)
European Commission (EC)
Joint Research Centre Directorate (DG JRC)
Institute for Environment
Title: Web site
I should have added that the IP change takes 12-24 hours to become effective on the Internet (dixit Register.com... which seems to encounter some problems at the moment).
Sorry about this delay.
Kind regards,
Gregoire
(Moderator of ai-geostats)
Goovaerts, Syed Abdul Rahman Shibli, Jeff Wolfe, Michel Maignan and Elisabeth Krausmann for their invaluable support.
Warm regards,
Gregoire
(Moderator of AI-GEOSTATS)
__
Gregoire Dubois (Ph.D.)
European Commission (EC)
Joint Research Centre Directorate (DG
).
Thank you for any hint on this matter.
Kind regards,
Gregoire
__
Gregoire Dubois (Ph.D.)
European Commission (EC)
Joint Research Centre Directorate (DG JRC)
WWW: http://www.ai-geostats.org
The views expressed are purely those of the writer and may
)
__
Gregoire Dubois (Ph.D.)
European Commission (EC)
Joint Research Centre Directorate (DG JRC)
Institute for Environment and Sustainability (IES)
TP 441, Via Fermi 1
21020 Ispra (VA)
ITALY
Tel. +39 (0)332 78 6360
Fax. +39 (0)332 78 5466
Email
Title: Message
Apparently many are not reading the footer of all mails
sent to the list:
To unsubscribefrom ai-geostats, send the following messageto [EMAIL PROTECTED]
signoff ai-geostats
Regards,
Gregoire
__ Gregoire Dubois (Ph.D.)
European
-GEOSTATS
__ Gregoire Dubois (Ph.D.)
European Commission
(EC) Joint Research
Centre Directorate (DG JRC) WWW: http://www.ai-geostats.org
"The views expressed are purely
those of the writer and may not in any circumstances be regarded as stating an
off
(Moderator of AI-GEOSTATS)
__
Gregoire Dubois (Ph.D.)
European Commission (EC)
Joint Research Centre Directorate (DG JRC)
Institute for Environment and Sustainability (IES)
TP 441, Via Fermi 1
21020 Ispra (VA)
ITALY
Tel. +39 (0)332 78 6360
Fax
this helps (and that my geostatistical souvenirs are still
correct)
Groetjes,
Gregoire
__
Gregoire Dubois (Ph.D.)
European Commission (EC)
Joint Research Centre Directorate (DG JRC)
WWW: http://www.ai-geostats.org
The views expressed are purely those
for your support and patience and long live ai-geostats@jrc.it
Kind regards,
Gregoire
PS: Digby, please feel free to post your question again on skewed distributions
__
Gregoire Dubois (Ph.D.)
European Commission (EC)
Joint Research Centre
Title: Message
Hi
Digby,
the
mailing list is still in the middle of moving for unil.ch to jrc.it (only 11%
have transferred their subscription today).
I
would recommend all to send your requests and repliesearly next week
onlyto the newlist. There is also some testing needed to
ensure
Title: Message
Ooops... wrong alias, here is my message again
Gregoire
__ Gregoire Dubois (Ph.D.)
European Commission
(EC) Joint Research
Centre Directorate (DG JRC) WWW: http://www.ai-geostats.org
"The views expressed are purely
2nd test intruder
Yahoo! Messenger with Voice. PC-to-Phone calls for ridiculously low rates.
Title: Message
Dear
all,
I'm
currently trying to figure out what is going on with the list server of
ai-geostats: 90% of the addresses registered are bouncing and I received
complains about viruses...
Best
regards,
Gregoire
__ Gregoire Dubois
,
Gregoire
__
Gregoire Dubois (Ph.D.)
European Commission (EC)
Joint Research Centre (JRC)
Institute for Environment and Sustainability (IES)
TP 441, Via Fermi 1
21020 Ispra (VA)
ITALY
Tel. +39 (0)332 78 6360
Fax. +39 (0)332 78 5466
Email
Dear list,
In very short:
- AI-GEOSTATS.ORG will have to move to a new server and will have to be
completely redisgned. Hence, I will give only minimum support to it
(adding new material myself) during the coming weeks. Online forms will
still be active for a while until the server will have
Title: Message
4 times !
I guess my forwarded mail should be read by the rest of
the list as well to avoid similar situations in the
future.
Thanks
Gregoire
From: Gregoire Dubois
[mailto:[EMAIL PROTECTED] Sent: 09 February 2006
13:32To: 'Fran Manns'Subject: RE: [ai-geostats] Re
of methods. In: Terra Nostra, Heft Nr.
03/2002, Proceedings of the 8th Annual conference of the International
Association for Mathematical Geology, September 2002, Berlin, Germany.U.
Bayer, H. Burger and W. Skala (Eds), Vol. 1, pp. 473-478
__
Gregoire Dubois (Ph.D
A with a particular shape (e.g. defined by country borders) and a number of stations N (e.g. for mobile phone emitters), how do I define the optimal locations for these stations?
Thanks for any hints.
Gregoire
__
Gregoire Dubois (Ph.D.)
European Commission
guess
people installing emitters/antennas for mobile phones have answers to my
question..
Thanks,
Gregoire
__ Gregoire Dubois (Ph.D.)
European Commission (EC)
Joint Research Centre
(JRC) WWW: http://www.ai-geostats.org
"The views expressed are p
(Moderator of ai-geostats)
PS: Should you have problems accessing SIC2004, please use http://skm.jrc.it/documents/UserDocuments\UPL_4908.pdf
__
Gregoire Dubois (Ph.D.)
Joint Research Centre of the European Commission (EC JRC)
Institute for Environment
Title: AI-GEOSTATS web site
Dear all,
The problem in accessing the web site a few of you have is mainly due to cookies.
Our web servers network uses cookies and you have either to allow your web browser to accept cookies or to change the settings of your firewalls if you use any.
Title: Web site AI-GEOSTATS
Dear all,
A few of you have contacted me because of problems to access the web site.
Could you be so kind and try to access www.ai-geostats.org and to drop me a note if you can not access the site?
Thanks a lot for the help.
Best regards,
Gregoire
(free!) tool for visualising this problem is E{Z}-Kriging
(see FAQ section of AI-GEOSTATS) written by Denis Walvoort.
Hope this helps,
Gregoire
__
Gregoire Dubois (Ph.D.)
European Commission
Tel. +39 (0)332 78 6360
Fax. +39 (0)332 78 5466
WWW: http
Title: Message
Ciao
Sebastiano,
I
realized nobody replied to your question (sorry for have added confusion here).
I
don't see any objection in applying any interpolator to probability
values.
However, you should better use exact interpolators to
avoid getting probabilities of
Title: Message
I
recently attended a presentation about the mapping of soil properties. Kriging
was applied and I was wondering why a regression technique was used instead of a
classification algorithm.
Delineating soil properties seemed to be, at first sight, a
classification problem than
Hi Perry,
I am curious to see how others will reply to your second question on the
difference between a dataset with a trend and one that is
non-stationary! My reply may sound provocative: you can always remove a
trend when you recognize that there is one. Moving from non-stationarity
to
I forgot to Cc: to the list..
GD
From: Gregoire Dubois [mailto:[EMAIL PROTECTED]
Sent: 01 July 2005 13:04
To: 'Els Verfaillie'
Subject: RE: [ai-geostats] modelling trend and kriging type
At first sight, I would say in all fields where you have a dominating
physical/sociologigical phenomenon
Dear Recep,
I don't think the type of variable has any impact on the choice of the
detrending algorithm. There is indeed a whole collection of methods and
one can also cite the various methods in which the trend is modelled by
neural networks (e.g. Kanevski's NNRK Neural Network Residual
Ciao Simone,
I'm not sure I fully understand your question. Are you referring to the
monomials used to define the stationary trend model of the IRF-k?
What are these coefficients of 1 and -1 ?? I must admit I am very lazy
tonight !
The fundamental differences between IRF-k and UK can be found
attention.
Have nice Sunday!
Gregoire
__
Gregoire Dubois (Ph.D.)
JRC - European Commission
IES - Emissions and Health Unit
Radioactivity Environmental Monitoring group
TP 441, Via Fermi 1
21020 Ispra (VA)
ITALY
Tel. +39 (0)332 78 6360
Fax. +39 (0
into such a powerful communication and educational tool.
Best regards,
Gregoire
__
Gregoire Dubois (Ph.D.)
JRC - European Commission
IES - Emissions and Health Unit
Radioactivity Environmental Monitoring group
TP 441, Via Fermi 1
21020 Ispra (VA)
ITALY
Tel
ranges and their sill ratios, at the exception of the nugget, which has of course to be added.
__
Gregoire Dubois (Ph.D.)
JRC - European Commission
IES - Emissions and Health Unit
Radioactivity Environmental Monitoring group
TP 441, Via Fermi 1
21020
As indicated in the rules, jobs should be announced by means of the Jobs
section of the AI-GEOSTATS web site (www.ai-geostats.org) not by means of the
mailing list.
I have added the first announcement via the online form. Feel free to add
other jobs.
Regards
Gregoire (owner of ai-geostats)
an unknowing user to believe that it was not necessary.
Thanks again to all those who reacted to my mail.
Best regards,
Gregoire
__
Gregoire Dubois (Ph.D.)
JRC - European Commission
IES - Emissions and Health Unit
Radioactivity Environmental Monitoring
in advance for any feedback.
Gregoire
PS: a few points here good be added to Tom Mueller's FAQ on Geostatistical Software Conventions.
__
Gregoire Dubois (Ph.D.)
JRC - European Commission
IES - Emissions and Health Unit
Radioactivity Environmental
for decision making process.
Thank you in advance for any help.
Gregoire
__
Gregoire Dubois (Ph.D.)
JRC - European Commission
IES - Emissions and Health Unit
Radioactivity Environmental Monitoring group
TP 441, Via Fermi 1
21020 Ispra (VA)
ITALY
__
Gregoire Dubois (Ph.D.)
JRC - European Commission
IES - Emissions and Health Unit
Radioactivity Environmental Monitoring group
TP 441, Via Fermi 1
21020 Ispra (VA)
ITALY
Tel. +39 (0)332 78 6360
Fax. +39 (0)332 78 5466
Email: [EMAIL PROTECTED]
WWW: http://www.ai-geostats.org
WWW: http
.
Best wishes,
Gregoire
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Sent: 18 January 2005 17:45
To: Gregoire Dubois
Subject: Re: [ai-geostats] TIN, one thought
One thought
The first question I would ask is the purpose of the proposed maps,
i.e., what
Title: TIN, monitoring netwoks and density
Dear list,
I would appreciate feedback on an issue that is closely related to SIC2004
Let us consider a variable (air pollutants, radioactivity) that is measured at regular time intervals by an automatic monitoring network that is structured
. problem with omnidirectional semivariograms using all pairs of
points).
Any (additional) suggested
readings?
Thanks already to Mahdi Osman, Donald Myersa
andAdrian Chappell
Best regards,
Gregoire
__ Gregoire Dubois (Ph.D.)
JRC - European
Commission IES
you all and your dearests a merry Christmas and a happy, peaceful and healthy new year.
Best wishes,
Gregoire (moderator of ai-geostats)
__
Gregoire Dubois (Ph.D.)
JRC - European Commission
IES - Emissions and Health Unit
Radioactivity Environmental
life easier and more pleasant.
The group is at the moment not moderated.
Best wishes,
Gregoire (owner of ai-geostats)
PS: I didnt duplicate the list, people who want to join the lounge should therefore subscribe
__
Gregoire Dubois (Ph.D.)
JRC
Title: Message
-Original Message-From: Gregoire Dubois
[mailto:[EMAIL PROTECTED] Sent: 02 September 2004
09:42To: [EMAIL PROTECTED]Cc:
[EMAIL PROTECTED]Subject: Re: spatial
relationships
Hi Mark,
re-reading Isobel's mail, I thought about a proviso
on the proviso. I personally do
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 code a bit yourself to select the correct interpolation
function (Inverse
Ooops sorry, I have put a almost usless code. I will try to find
something more usefull on an old PC.
It will be on the web before the end of the day.
Sorry again
Gregoire
-Original Message-
From: Gregoire Dubois [mailto:[EMAIL PROTECTED]
Sent: 01 September 2004 10:57
To: [EMAIL
Empirisch Bayes'sche Methoden in der Geostatistik.
More recent codes and papers should be available from Juergen Pilz's and
Albrecht Gebhardt's homepages (again, see
http://www.math.uni-klu.ac.at/?language=en )
Hope this helps a bit.
__
Gregoire Dubois
.
Very nice tools both for students and for teachers !
Enjoy !
Gregoire (moderator of ai-geostats)
__
Gregoire Dubois (Ph.D.)
JRC - European Commission
IES - Emissions and Health Unit
Radioactivity Environmental Monitoring group
TP 441, Via Fermi 1
21020 Ispra
Good day everyone !
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 bent this rule a
little and i worked with 35 points
and I even worked with 9 or 10 points recently (how shocking !).
It is true that one of
to participate.
Links to
the web site would be also very much appreciated
__
Gregoire Dubois (Ph.D.)
JRC - European Commission
IES - Emissions and Health
Unit
Radioactivity Environmental Monitoring
group
TP 441, Via Fermi 1
21020 Ispra (VA)
ITALY
Tel. +39
Title: Message
Hello
Syed,
I
washoping a reply from you :)
I
didn't think aboutthe problematic of anisotropy and thepotential use
of ratios of fractal dimensions. It might be worth some further investigation.
The
physical meaning of fractals derived from directional variograms is
omputation of
thesemivariance.
__
Gregoire Dubois (Ph.D.)
JRC - European Commission
IES - Emissions and Health
Unit
Radioactivity Environmental Monitoring
group
TP 441, Via Fermi 1
21020 Ispra (VA)
ITALY
Tel. +39 (0)332 78 6360
Fax. +39 (0)332 78 5466
Email: [EMAIL
Title: Message
About your question
on heterogeneity in spatial data. Sorry formy very lazy answer but one
elegant way to deal with such heterogeneity is Denis Allard's class kriging.
See http://www.ai-geostats.org/papers/_papers/000e.htm
Gregoire
PS: I just have
checked the ftp
but for other days,
...?)
This is where we are now.
Best wishes and thanks in advance for any feedback,
Gregoire
-Original Message-
From: Gerald Boogaart [mailto:[EMAIL PROTECTED]
Sent: 21 April 2004 11:47
To: Gregoire Dubois; [EMAIL PROTECTED]
Subject: Re: AI-GEOSTATS: SIC2004
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
subject of the email. An email confirming that you are
registered will be sent back to you. No questions sent beforeMonday the3rd of May 2004 about theexact content/purpose of SIC2004 will be
answered.
______
Gregoire Dubois (Ph.D.)
JRC - European Commissi
You can send messages from any account that is subscribed to the list.
Regards
Gregoire (moderator of ai-geostats)
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of [EMAIL PROTECTED]
Sent: 31 March 2004 18:46
To: [EMAIL PROTECTED]
Subject: AI-GEOSTATS:
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
Please avoid sending attachments without warning on the ai-geostats
mailing list.
They slow down the distribution of mails and often contain viruses.
Regards,
Gregoire (owner/moderator of ai-geostats)
--
* To post a message to the list, send it to [EMAIL PROTECTED]
* As a general service to
A few mails with the word SPAM in the subject seem to have been lost for
archiving due to spam filtering... please check the subjects of your mails
before posting.
My 2 cents words about microgeostatistics. The scale at which geostatistics is
applied to should not affect the method at all. It is
Title: Message
Hello
everyone,
I have received
around 30 messages related to the "advert" case, a mixture of mails supporting
Isobel and of others less
supporting, to say
the least.
This posting is my
reply to all and should close the case. So please, no reaction to it on the
list, but
This is a reminder about the deadline for the submission of abstracts of
the 32nd International Geological Congress: 32nd IGC Florence (Italy),
20-28 August 2004.
The deadline for submission of the abstract is the 28th of January.
See http://www.32igc.org/ for more information.
Between
CALL FOR PAPERS
Joint meeting of TIES 2004: The International Environmetrics Society
and ACCURACY 2004: 6th International Symposium on Spatial Accuracy Assessment
For the first time, the annual TIES conference and the biennial Spatial
Accuracy Symposium will hold a joint meeting reflecting their
AI-GEOSTATS is back online now ... sorry for the problem. We had a black out
in Italy while I was attending the StatGIS conference. Nobody here thought
about rebooting the web server :(
Gregoire
Martin Roseveare [EMAIL PROTECTED] wrote:
Not getting any response from it either...
Martin
Hi Peter,
I also found the topic frequently unclear.
This is what I understood from my readings. In particular, I would recommnend
the following excellent paper:
B. Efron and G. Gong, A leisurely look at the bootstrap, the jackknife and
cross-validation. Am. Stat. 37 (1983), pp. 3648.
Maciej
Good day to the Southern hemisphere !
I presume many are on holiday in the northern hemisphere, hence I hope to get
more feedback from the South :)
In a paper published in Nature (Nature, 1981, Vol. 294, pp. 240-242: Fractal
dimensions of landscapes and other environmental data), Peter Burrough
Good day everyone,
In an previous mail I mentioned a problem I have found in Surfer concerning
the statistics (obtained during the cross-validation step) generated when the
No search option was set.
Apparently the bug caused the gridding search neighborhood to contain more or
less points than
Has anyone encountered a problem with Surfer 8 and its settings for what
concerns the search strategy and its impact on the nugget effect?
If you set the search option to No Search during the gridding step, and if
you set any value for the nugget effect (the error variance here only, I kept
the
In addition to Pierre's comments on the risks of extrapolating, I also got the
two following replies
Lynn J. Torak
Perhaps the border effect is caused by an ill-conditioned matrix
presented to either the direct or iterative solver of the geostat program,
causing an oscillation in the solution.
Dear members,
analysing a set of data, in which positive values, located in the middle of
the investigated area, are surrounded by null values, I obtained non- zero
values outside of the investigated area (what I called here a border
effect). My variogram is a simple exponential model with no
Dear all,
I have put the exhaustive Walker Lake data set in the resources of
AI-GEOSTATS. So far there was only the test set used by Isaak and Srivastava
in their book Applied geostatistics
http://www.ai-geostats.org/resources/spatial_data.htm#Geostats
Best regards,
Gregoire
--
* To post a
Where else than on the ai-geostats web site ?
http://www.ai-geostats.org/resources/Data/walker.dat
Best regards,
Gregoire
Ian Hunt [KLP BUSINESS DEVELOPMENT] [EMAIL PROTECTED] wrote:
Dear list-members,
I need links to download the full Walker Lake Data Set as it is used in
Applied
ps !
Sorry, I gave Ana Militino as the source of Peter Rogerson's paper instead of
DARLA MUNROE. Ana provided another reference which was sent directly to the
list.
Sorry for that. When I said I was getting old...
Gregoire
--
* To post a message to the list, send it to [EMAIL PROTECTED]
*
o) that there is only one true variogram model
for our problem and hence we want to find the best way to find that true
variogram. One way to make it look more unique is to put more assumptions
in such as multivariate normality which may or may not be reasonable.
Donald Myers
http://www.u.arizona.edu/
Dear all,
cross-validation techniques can be used to evaluate the suitability of the
parameters chosen for an estimation problem.
Minimising a global error might be too restrictive and might not be suitable
to solve some practical problems. In the case of a large-scale pollution
problem, one
Dear all,
here is a summary of the two replies I got to my question on robust variograms
and automatic mapping:
1) The following reading was suggested by Victor De Oliveira
Lark, R.M. (2000), A comparison of some robust estimators of the variogram for
use in soil survey, European Journal of
CALL FOR PAPERS
ACM GIS November 7-8, 2003, New Orleans, Louisiana USA
http://www.esri.com/events/acm/index.htm
Introduction
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The 11th International Symposium of ACM GIS will take place in New Orleans,
Louisiana on November 7th and 8th, 2003. It is the 11th of a series of
Dear all,
I'm looking for papers investigating the sensitivity of automatic variogram
fitting functions to outliers. I'm aware of Genton's work
on robust variograms but still look for papers.
Of course I would welcome a discussion about such topic.
Unless I'm completely out of date, most
To my question on the use of rodograms I got the two following references:
Paul Harris gave me the following:
Journel A. 1988. +IBw-New distance measures: the route toward truly non-gaussian
geostatistics+IB0, mathematical geology vol 20 no 4.
Pierre Goovaerts mentioned at paper presented at
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