... One possible suggestion: topographic roughness is often quantified by the power spectrum of the elevation plotted on a log-log scale as a function of the...
1083
Reed Copsey
reed@...
Jun 25, 2003 8:09 am
Ann, Though our software was developed primarily for Earth Science applications, Arizona State University is using our EVS-PRO software to animate fetal mouse...
1084
Adrian Martínez Va...
amvargas@...
Jun 25, 2003 8:09 am
You can use too the local standard deviation or correlation coefficient, obtained by moving windows. It can let you see de local variations of the roughness....
1085
Klemens Barfus
klemens.barfus@...
Jun 25, 2003 8:09 am
Dear list-members, First of all, I am a Newbie to simulation. I want to simulate cloud fields, described by the liquid water path - a measure for the liquid...
1086
Joe Geo
joegeo705@...
Jun 26, 2003 6:08 am
Dear ai-geostats readers, I'm interested in direct block simulation. To get block simulated results I have been averaging node results into a larger volume...
1087
ANN ZUMWALT
azumwalt@...
Jul 1, 2003 8:01 am
Last week I wrote to the list asking for advice about testing for differences between surfaces, especially surface rugosity (original message at the end of...
1088
Pierre Goovaerts
goovaert@...
Jul 7, 2003 9:57 am
Hi Oliver, I don't know which algorithm you are using to compute these declustering weights but there is something wrong in your rescaling procedure. These...
1089
Michael Pyrcz
mpyrcz@...
Jul 7, 2003 9:57 am
Good day Oliver, I have another comment on declustering in addition to the previous comment on negative weights. The weights do not actually change the data...
1090
oliver.sonnentag@...
Jul 7, 2003 9:57 am
hello list, to get the global mean of my data set (484 observation wells) and as a prerequisite for Normal Score Transformation with GSLIB, i declustered my...
1091
Edzer J. Pebesma
e.pebesma@...
Jul 8, 2003 12:44 pm
... Nick, you could look up what the "block = c(40,40)" argument stands for, e.g. by reading the help on the krige function: type ?krige or start the on-line...
1092
Nick Hamm
n.hamm@...
Jul 8, 2003 12:44 pm
Hi, I've been using gstat under R and trying to do some block--kriging. I then want display the output from the block kriging using the levelplot command....
1093
Edzer J. Pebesma
e.pebesma@...
Jul 9, 2003 8:07 am
... Depending on the strength of spatial correlaton and block size. If blocks are small and spatial correlation strong, the difference may be negligible. If...
1094
Pierre Goovaerts
goovaert@...
Jul 9, 2003 8:07 am
Hi Ulrich, It's not an easy question. First note that the search strategy includes not only the size of the search window but also the maximum number of...
1095
Isobel Clark
drisobelclark@...
Jul 9, 2003 8:07 am
Ulrich Depends how powerful your computer is, what algorithm you use to solve equations and how many data you have. Isobel ...
1096
Juliann Aukema
aukemaj@...
Jul 9, 2003 8:07 am
Hi, I have a sampling question. I am planning a study to look at plant diversity and plant distribution patterns in a karstic area. The topography is a series ...
1097
Ulrich Leopold
uleopold@...
Jul 9, 2003 8:07 am
Dear list, What would you consider the most reliable ordinary kriging estimate? To use a local search neighbourhood (slightly bigger than the effective range)...
1098
Dobler, Lorenz
lorenz.dobler@...
Jul 9, 2003 8:08 am
hello all, There are some similarities between interpolation-algorithms based on radial basis functions and kriging. I am not sure whether i understood it...
1099
Gregoire Dubois
aigeostats
Jul 9, 2003 9:57 am
Hi Ulrich I'm surprised we got mainly "pragmatic" answers to your question and would have expected from statisticians and mathematicians more reactions about a...
1100
Ulrich Leopold
uleopold@...
Jul 10, 2003 9:41 am
... I agree. But then you need to model the experimental semivariogram for all distances. Wouldn't this be a problem to find a reliable model fit? ... The...
1101
kerryritter2003
kerryr@...
Jul 11, 2003 8:24 am
I was wondering if anyone new of the existence of an algorithm written for Splus designed to perform indicator or disjunctive kriging? Thanks, Kerry...
1102
Ruben Roa
rroa@...
Jul 11, 2003 8:24 am
... have expected from statisticians and mathematicians more reactions about a possible statistical heresy: the semivariogram model is fitted to an ...
1103
Russell Barbour
russell.barbour@...
Jul 11, 2003 8:24 am
To measure auto-coorelation Moran's I is compared to the expected "I" that would be generated from a random distribution. My question is if the observed ...
1104
Kerry Ritter
kerryr@...
Jul 11, 2003 8:24 am
I was wondering if anyone knew of the existence of an algorithm written for Splus that performs indicator or disjunctive kriging. Thanks, Kerry [Non-text...
1105
jean-noel.candau@...
Jul 11, 2003 8:24 am
Hi all, I have a multivariate (44 variables) dataset of 21,000 points. I would like to calculate variograms for each variable but my usual statistical software...
1106
Adrian Martínez Va...
amvargas@...
Jul 11, 2003 8:24 am
I have good results using an random sampling of the original data, if it is representative the variogram will be similar to the variogram with large data....
1107
Isobel Clark
drisobelclark@...
Jul 13, 2003 12:18 pm
Maybe it is worth pointing out that Ordinary Kriging with a 'global neighbourhood' (using all the points in simple speak) is the same as Simple Kriging with a ...
1108
Ulrich Leopold
uleopold@...
Jul 15, 2003 3:38 pm
Dear list, I encounter a problem in Gstat. I posted my message to the Gstat list but get currently no answer. Maybe someone here experienced this problem...
1109
æˆä»”
fan0929.cc01787@...
Jul 15, 2003 3:38 pm
Hello all members. I have a question about the subroutine "SASIM" in "Gislib". I have 42 sample data and analysis it's spatial correction structure...
1110
Pierre Goovaerts
goovaert@...
Jul 16, 2003 7:26 am
Hello, First you have to see what is the perturbation mechanism used in the program: random swapping or random sampling of target histogram. In the first case,...
1111
Adrian Martinez Vargas
amvargas@...
Jul 16, 2003 7:27 am
I have calculate the error retrieved by few methods using Jacknife technique, I have use to the classical cross correlation but the error was to small, the...
