Hi. I am ecologist, too. While I am not a geostatistician, I don't recall seeing strong arguments to suggest that some processes lead to one spatial model...
545
Javier
andresjavier.garcia@...
Mar 7, 2002 10:09 am
Hello; I´m looking for geostat software, able to perform indicator kriging in 3-D, including hard and soft data; and to perform stochastic simulations. I know...
546
Gregoire Dubois
aigeostats
Mar 7, 2002 10:09 am
Dear all, I finally managed to find the time to go back to Lausanne for a quick update of the AI-GEOSTATS web site. If you have information that cannot be put...
547
passandi@...
Mar 7, 2002 12:18 pm
Dear friends, What is the base of choosing ANGLE TOLERANCE and BANDWIDTH values in directional variogram for irregularly spaced data? Thank you for your...
548
Robert Buci
landscape@...
Mar 25, 2002 12:25 pm
Dear list members, let me inform you about upcomming Summer School for Ph. D. students. UNESCO Chair for Ecological Awareness and Sustainable Development, TU ...
549
Ercan Yesilirmak
ercanyesilirmak@...
Mar 26, 2002 9:22 am
Dear list members My question is as folows: For a variable after getting a number of models all of which seem well, how to decide which one is the best among...
550
Soeren Nymand Lophaven
snl@...
Mar 26, 2002 4:57 pm
Dear Ercan Cross validation could for example be performed by discarding a single observation from the dataset and predicting this single observation based on ...
551
Gregoire Dubois
aigeostats
Mar 26, 2002 5:53 pm
Dear Ercan, the choice of the cross-validation error function should depend on the objectives of your work: you could focus on extreme values, on the root mean...
552
José Quintín Cu...
cuador@...
Mar 27, 2002 9:09 am
Dear list members The Kriging variance has some uses. In mining, it can be used in the Ore Reserves Classification. What is the opinion about this in the...
553
Myers, Jeff
Jeff.Myers@...
Mar 27, 2002 9:09 am
Ercan - I can provide you with a copy of my 1991 paper on Type-Casting of Error that describes classifying Type I and II errors according to threshold cutoffs....
555
Ercan Yesilirmak
ercanyesilirmak@...
Mar 27, 2002 3:18 pm
Dear list members I have a question which I faced during a practice. The data on which I am studying belongs to groundwater quality parameters at a coastal...
556
Turkan Kaynak
turkan@...
Apr 2, 2002 8:44 am
Dear Jose, I'm a mining engineer and I think I can answer your question. We use kriging variance for reserve classification. I think you know, the reserves are...
557
Luis Eduardo de Souza
esouza@...
Apr 2, 2002 8:44 am
The estimate and the subsequent classification of the resources in different classes or categories is based on different levels of risk and requires a model...
558
Isobel Clark
drisobelclark@...
Apr 2, 2002 8:45 am
Dear All I have received a couple of emails about difficulties with accessing the stuff in my Yahoo "briefcase". Please accept my apologies for not reading the...
559
Richard Hague
richardh@...
Apr 3, 2002 1:47 pm
List Members, The use of the kriging variance to categorise/classify Mineral (Ore) Resources and/or Ore Reserves is an old chestnut that periodically raises...
560
Isobel Clark
drisobelclark@...
Apr 3, 2002 1:47 pm
Richard Thanks for the clear exposition on the limitation of the kriging variance as a measure of reliability for block estimation. It should, perhaps, be...
561
Stelpstra, David
stelpstra@...
Apr 3, 2002 1:47 pm
Dear list members, I wish to make a remark on the discussion started on the kriging variance. In my opinion the SD of the solution obtained by kriging is...
562
Didiek Bhudy Prabowo
didiekbp@...
Apr 4, 2002 8:27 am
Dear members, I want to know about geostatistics inversion. What was it ? Can you help me ? Best regards Didiek Bhudy Prabowo University of Indonesia ... ...
563
Cardellini Carlo
geochem@...
Apr 4, 2002 11:16 am
Dear members, could you suggest me papers about application of sequential Gaussian simulations to soil sciences, i.e., spatial distribution of a continuous ...
564
Soeren Nymand Lophaven
snl@...
Apr 5, 2002 8:22 am
I would suggest: @Article{rossi:1993, author = {R.E. Rossi and P.W. Borth and J.J. Tollefson}, title = {Stochastic simulation for...
565
Bambang Trisasongko
bht@...
Apr 8, 2002 8:11 am
Dear Didiek, Inversion is advanced topics in Geostatistics. There is good introduction to inverse problems (and scale effects) in chapter 8 of J-P Chiles and ...
566
lorenz.dobler@...
Apr 9, 2002 8:28 am
dear members, Is there anyone with experiences in indicator kriging with soft data using gslib ? i have a continous primary variable and a continous...
567
William Thayer
thayer@...
Apr 9, 2002 8:28 am
I am interested in comparing different estimators of spatial means. Any suggestions or approaches on how to generate a 2-D, autocorrelated, skewed ...
568
Sibylle Eisenberger
s.eisenberger@...
Apr 9, 2002 11:42 am
I´m doing my diploma thesis on the spatial distribution of weeds and I´m an absolute beginner with geostatistics. Please take that into account when reading...
569
Edzer J. Pebesma
e.pebesma@...
Apr 9, 2002 11:42 am
Yes. Generate a Gaussian random field, add a deterministic trend surface, and take the exponent or a power transform of the sum. -- Edzer ... -- * To post a...
570
Edzer J. Pebesma
e.pebesma@...
Apr 9, 2002 1:22 pm
Dear Sibylle, I suspect your residuals will never become normal, because your data are counts. Luckily, normality is not a requirement for variogram ...
571
Rubens Caldeira Monte...
rubenscm@...
Apr 10, 2002 9:42 am
Dear all, We are trying to apply Universal Kriging to “High Plains” Aquifer in Kansas (OLEA, 1999) for land surface elevation (LSE), using its 317 data ...
572
Marta Rufino
mrufino@...
Apr 10, 2002 9:42 am
Hello, I would like to know if there is any free softwares (for windows), "easy to use" that can perform spheric variogram fitting cross-variogram co-krigging ...
573
Isobel Clark
drisobelclark@...
Apr 10, 2002 9:42 am
Rubens Your approach has been long used in hydrology and similar fields with much success. The problem with the standard deviation is that it does not include...
574
Isobel Clark
drisobelclark@...
Apr 11, 2002 7:56 am
Alessandro Thanks for the contribution. If Universal Kriging is applied, there is no need for simulation or multi-indicator approaches to get a standard error,...
