Hi, Well, the bayesian kriging methods you are describing are somewhat different than what i am using. I am using R and geoR by Ribeiro and Diggle (2001). Web...
1680
Isobel Clark
drisobelclark@...
Sep 1, 2004 11:18 am
Mark I could not agree more with Gregoire (with one proviso, see below). Both geostatistics and any weighted average estimators are based on the same...
1681
Gregoire Dubois
gregoire.dubois@...
Sep 1, 2004 11:18 am
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...
1682
Mark Dowdall
mark.dowdall@...
Sep 1, 2004 11:19 am
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 through the archives and...
1683
Gregoire Dubois
gregoire.dubois@...
Sep 3, 2004 9:04 am
... From: Gregoire Dubois [mailto:gregoire.dubois@...] Sent: 02 September 2004 09:42 To: mark.dowdall@... Cc: drisobelclark@... Subject: Re:...
1684
Isobel Clark
drisobelclark@...
Sep 3, 2004 9:04 am
Gregoire/Mark Yes, a trend is a spatial structure and can be used for prediction purposes. It just isn't suitable for 'stationary' geostatistical analysis. I...
1685
Glover, Tim
ntglover@...
Sep 3, 2004 9:04 am
Thisa reminds me of a site where the "failure" of variogram modeling actually told me quite a bit about the problem at hand. It was a large field where...
1686
Ted Harding
Ted.Harding@...
Sep 3, 2004 9:04 am
... Indeed! It's the difference between discovery and measurement. Best wishes, Ted. ... E-Mail: (Ted Harding) <Ted.Harding@...> Fax-to-email: +44...
1687
Isobel Clark
drisobelclark@...
Sep 3, 2004 9:04 am
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 ...
1688
Pierre Goovaerts
goovaert@...
Sep 3, 2004 9:04 am
I would agree with Gregoire's assessment. The presence of a global trend does not prohibit the use of geostatistics. As illustrated in the following paper by...
1689
Kevin M. Curtin
curtin@...
Sep 3, 2004 9:04 am
Hello All, I'm not sure if this is the correct forum for this.but a colleague has asked a question I'd like to address. This fellow wants to predict the...
1690
Isobel Clark
drisobelclark@...
Sep 3, 2004 9:04 am
Kevin Sounds like an ideal case for Geographically Weighted Regression. You could use semi-variograms or spatial auto-correlation to determine exactly how...
1691
Koen Hufkens
koen.hufkens@...
Sep 3, 2004 9:04 am
Some random remarks that went through my single braincell: I would focus on the physical environment to predict the locations, but it depends on what you call...
1692
Beatrice Mare-Jones
B.Mare-Jones@...
Sep 3, 2004 9:04 am
Hello Kevin You may like to speak to David Hansen a GIS Specialist/ Soil Scientist at the USGS in Sacramento - dhansen@... He has a good paper...
1693
sebastiano
sebastiano.trevisani@...
Sep 3, 2004 9:05 am
I think that a fuzzy logic system approach is well suited for you task Some book where you can find something "Principle of Geographical information Systems"...
1694
Steven Citron-Pousty
Steven.Citron-Pousty@...
Sep 3, 2004 9:05 am
You might look at the following series of papers: http://www.nceas.ucsb.edu/~liebhold/ecography/ While the papers are written with an ecological focus,...
1695
Chaosheng Zhang
Chaosheng.Zhang@...
Sep 3, 2004 9:05 am
Hi all, The interesting story given by Tim Glover is a good example of "spatial outliers". The dumptruck loads of polluted soils are too different from the...
1696
Viktoras Didziulis
viktoras.didziulis@...
Sep 3, 2004 9:05 am
Hello, Kevin ! Predictive interpolation is a very interesting field. You may be interested in GIS applications based on Dempster-Shafer Theory.
There are some...
1697
Rajive Ganguli
rajive.ganguli@...
Sep 6, 2004 11:53 am
With ref. to the posting below (AI techniques and predictive work), we have recently done a lot of work comparing kriging and neural network performance. As...
1698
Niels Chr. Nielsen
niels_c_nielsen@...
Sep 6, 2004 11:54 am
Isobel, Kevin and others I would be very interested as well, since my collegue (an archaeologist) and myself (geographer) are doing work on Bronze Age Denmark,...
1699
Gregoire Dubois
gregoire.dubois@...
Sep 7, 2004 11:13 am
Please find hereafter the last call for a scientific exercise dedicated to spatial statistics called SIC2004. SIC2004 stands for Spatial Interpolation...
1700
Volker Bahn
lochapoka@...
Sep 10, 2004 7:40 am
Hi Kevin, I work in the field of distribution modeling of birds and somewhat come from the other direction than most geostatistics people here on the list. In ...
1701
kai.zosseder@...
Sep 10, 2004 7:42 am
Hello list, First of all, thanks for the many replies to my last question. That was really helpful. Thanks !! Now I have an additional question (and hope it is...
1702
Sanghoon Kang
sk7k@...
Sep 13, 2004 8:50 am
Dear everyone, I'm new to this mailing list and the field of geostatistics, so my question might be too obvious, but I don't have anyone around to get some...
1703
Pierre Goovaerts
goovaert@...
Sep 13, 2004 8:52 am
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...
1704
Christof Bigler
christof.bigler@...
Sep 30, 2004 6:13 am
Mark - you'll find a list of free GIS packages on this website: http://freegis.org/ One of the most comprehensive free and open source GIS is GRASS, which is...
1705
Mark Coleman
mark@...
Sep 30, 2004 6:13 am
Greetings, I am interested in getting a basic GIS package that runs on Mac OSX. I'd very much appreciate suggestions. Thanks, -Mark * By using the ai-geostats...
1706
Adrian MartÃnez V...
amvargas@...
Sep 30, 2004 6:13 am
VAR[X]=E[X^2]-E[X]^2=E[X(X-1)]+E[X]-E[X]^2 I have received a document where they make emphasis in the expression E[X(X-1)] it have some special meaning or...
1707
Isobel Clark
drisobelclark@...
Oct 4, 2004 10:08 am
xhy your questions are long-standing and as yet unanswered in general. ... I always think of it as focussing a camera. Believe there is a pattern in your data...
Dear all, I have a question on the selection of the lag classes and lag distance when computing experimental semi-variogram. It has been suggested that the...
