Hi Kent, Usually the search strategy can be limited to the definition of the maximum number of observations to be used for kriging, leaving the search radius...
1030
kent.todd@...
May 16, 2003 11:50 am
Dear listerv members, I am currently working on interpolating bathimetric lidar measurements for part of Lake Ontario. The dataset has an extremely high point...
1031
Hannes Reuter
hreuter@...
May 18, 2003 8:19 am
Dear all, I have a couple of questions concerning the application of the n/s ratio for semivariogram analysis: 1) what are the implications of different...
1032
Ruben Roa
rroa@...
May 18, 2003 8:19 am
Colleagues: Has anyone used transitive geostatistics to estimate the area of a regionalized variable? Any references apart from Matheron's lecture notes, i...
1033
Pierre Goovaerts
goovaert@...
May 18, 2003 8:19 am
Dear Hannes, Why are you interested in this ratio? Since linear and power models don't have a sill, this ratio can not be computed. And for nested models, it...
1034
Ruben Roa
rroa@...
May 21, 2003 8:13 am
Hi Donald. According to the *transitive* theory of geostatistics, it is possible to estimate (to have an estimate and the error variance of) the total area of...
1035
Marcel Vallée
vallee.marcel@...
May 21, 2003 8:13 am
Hi Ruben I am perplexed by your querry. I am a mining and exploration geologist, and a follower of geostatistics since the lectures given at École...
1036
daniel guibal
dguibal@...
May 21, 2003 8:13 am
There is nothing perplexing about the transitive method. It has been the one of the starting points of Matheron's work. Instead of probabilising the variable...
1037
Syed Abdul Rahman Shi...
syed@...
May 21, 2003 8:13 am
I was initially perplexed as well but perhaps Ruben meant using indicator simulation techniques to generate patches of areas of different indicator values, for...
1038
Ruben Roa
rroa@...
May 22, 2003 2:40 pm
... one of the starting points of Matheron's work. Instead of probabilising the variable (grade for instance), the origin of the grid is randomized and this...
1039
stef
sepd2003@...
May 24, 2003 12:59 pm
Hello, I does anyone have experience building cellular automata with GRASS? Thank you, Stef __________________________________ Do you Yahoo!? The New Yahoo!...
1040
Pierre Goovaerts
goovaert@...
May 24, 2003 12:59 pm
Hello, The constraint that the sill must be one arises from the fact that the simulation is conducted in the normal space. Just standardize the semivariogram...
1041
Martin Roseveare
martin_roseveare@...
May 24, 2003 12:59 pm
I'm interested in different approaches to the estimation of significance (based on amplitude) of regions in planar magnetic susceptibility data. To summarise,...
1042
Alvaro Silva
alvaro.silva@...
May 26, 2003 2:51 pm
Hi, Anyone knows where to find something about disjunctive kriging and cokriging. In what data is more suitable to use? What about the data transformations?...
1043
Heinz Burger
hburger@...
May 26, 2003 2:51 pm
Hi Alvaro, please see papers of Yates & Warrick, Water Resources Res. Vol 22 No. 5 and 10 (1986). Program in Comp&Geosci 12, p. 281 ff. Heinz Burger ...
1044
Ruben Roa
rroa@...
May 26, 2003 2:51 pm
... But this is not too surprising: as I said, its use is restricted to volume/surface error estimation and this can generally be handled through rough...
1045
dwmccarn@...
May 27, 2003 8:02 am
Hello: I'm doing some risk simulation and need to have a good random number generator with several types of distributions using Visual Basic or VBA. Does...
1046
Roger Bivand
Roger.Bivand@...
May 27, 2003 8:02 am
... This may not be what you expect, but calling the RNGs in R through the R(D)COM connector (R as a server serving your VB/VBA) might provide a well-proven...
1047
Adrian Martínez Va...
amvargas@...
May 27, 2003 8:02 am
In the FAQ mage of AI-GEOSTATS we can see [10.2] How does Sequential Gaussian Simulation work? Transform the data into a normal distribution. Then perform...
1048
Isobel Clark
drisobelclark@...
May 27, 2003 8:02 am
Hello people Just a note to say the latest version of the kriging game has been put up on the web site: http://geoecosse.bizland.com/softwares We would really...
1049
Pierre Goovaerts
goovaert@...
May 28, 2003 10:43 am
Hello, I am afraid that your approach of using cross validation results to select the semivariogram model suffers from several limitations. 1. Cross validation...
1050
Ulas OZER
ulas.ozer@...
May 28, 2003 10:43 am
Dear ai-geoastats members; I have been studying with Geostatistics (GS) approximate for one year. Now I am passing a learning process. Therefore I have a lot...
1051
fevzi akbas
fevzi@...
May 28, 2003 11:09 am
dear all, I modelled a semivariogram and then using this variogram parameter performed cross validation. The computer program gives cross validation results as...
1052
Laëtitia Mary
l-mary@...
Jun 3, 2003 3:55 pm
Bonjour, Je travaille actuellement sur un programme devant permettre à terme de cartographier automatiquement la pollution atmosphérique sous ArcView 8. La...
1053
Isobel Clark
drisobelclark@...
Jun 6, 2003 1:49 pm
Hello people Sorry to gum up the e-waves but I promised a photocopy of my copy of Matheron's 1971 notes to someone and I have mislaid the email. Anyone out...
1054
Serele, Charles
Charles.Serele@...
Jun 10, 2003 7:27 am
Hi All, I got some results from a variogram analysis on two remote sensing images with pixel size of 8m and 30m each. I would like to know the physical meaning...
1055
Adrian Martinez Vargas
amvargas@...
Jun 10, 2003 7:27 am
wat is Moran, were it is realy usefull? ... From: <monfrodo@...> To: <ai-geostats@...> Sent: Friday, June 06, 2003 8:26 AM Subject: AI-GEOSTATS:...
1056
Pierre Goovaerts
goovaert@...
Jun 10, 2003 7:27 am
Hi Joe, After the backtransform, the distribution of simulated values at each node is not Gaussian anymore and its variance can be used as a local index of...
1057
Adrian Martinez Vargas
amvargas@...
Jun 10, 2003 7:27 am
the meaning of these is the continuity of the "reflactanse" or colour value measured in each pixel, it seem to be low continuity, the size of the range is...
1058
monfrodo@...
Jun 10, 2003 7:27 am
Hello, I would like to calculate the significance level of each Moran ´s I value in a correlogram. The Gs+ program only calculate the global significance of...
