Dear list members, I want to perform kriging of water quality indicators measured in stations along a river course, so Can you help me with references about...
1933
Noemi Barabas
nbarabas@...
Feb 26, 2005 8:45 am
Dear Oscar, It sounds like you need kriging in a single dimension. If so, I think what you need to do is a kind of coordinate transformation, for example...
1934
Noemi Barabas
nbarabas@...
Feb 26, 2005 8:45 am
Edzer, You are right about river networks. I do think that the uni-directionality of flow is not necessarily a problem in terms of what can inform what....
1935
Edzer J. Pebesma
e.pebesma@...
Feb 26, 2005 8:45 am
Noemi, the idea of transforming to a one-dimensional situation, distance along river, was the first one I got. Then, I rejected it because it will not work for...
1936
Donald E. Myers
myers@...
Feb 26, 2005 8:46 am
Additional space-time references * 2003, De Iaco, S, Myers, D.E., and Posa, D., The Linear Coregionalization Model and the Product-Sum Space-Time Variogram. ...
1937
Dave Miller
Dave.Miller@...
Mar 3, 2005 9:59 am
Dear all, Please bear with me on this. A first submission to the list from a perplexed and increasingly stressed research assistant (I'm sure you've all been...
1938
Isobel Clark
drisobelclark@...
Mar 6, 2005 9:23 am
Marek Although theoretically non-point support has no reason to be lognormal, in practice it very often is. We have had good results in estimating areas and...
1939
Ranjan S. Muttiah
r.muttiah@...
Mar 6, 2005 9:23 am
Typically, thermal bands in remote sensors have coarse resolution. I’m working with ETM+ thermal 60m data for an urban area. I would like to get fine...
1940
Ing. Marek Brabec PhD
mbrabec@...
Mar 6, 2005 9:23 am
hello, I have a question about what is/should be typically done when kriging is used for spatial interpolation of a process X(z) where z gives spatial location...
1941
Ruben Roa Ureta
rroa@...
Mar 6, 2005 9:23 am
... As far as i know, traditional geostatistics as originated in Matheron is distribution-free. The analysis does not require a pre-experimental probability...
1942
Chaosheng Zhang
Chaosheng.Zhang@...
Mar 6, 2005 9:23 am
Hi Dave, My concern is that the 25 locations may not be enough to capture the spatial structure of the parameter (which climatic data?) across the UK. As...
1943
Mahdi Osman
m_osm@...
Mar 6, 2005 9:23 am
As an addition to my previous messge............. VarioWin, Vesper etc are easy tools for variography. Variowin offers a simple interactive variogram modelling...
1944
Isobel Clark
drisobelclark@...
Mar 6, 2005 9:23 am
Ruben (et al) It is true that Matheron's theory is based on no distributional assumptions. In fact, there is no requirement for the distribution to be the same...
1945
Roger Bivand
Roger.Bivand@...
Mar 14, 2005 8:29 am
... One possible reason for problems with trend surface and standard OLS functions is that if, say, coordinates are in UTM metres, y^3 in particular will...
1946
Isobel Clark
drisobelclark@...
Mar 14, 2005 8:29 am
Njeri I am forwarding this to the AI-Geostats mailing list in the hope that someone there can answer your query. I would probably tackle it using indicator ...
1947
Chunhua Zhang
chz939@...
Mar 14, 2005 8:29 am
Thanks all for your help! * By using the ai-geostats mailing list you agree to follow its rules ( see http://www.ai-geostats.org/help_ai-geostats.htm ) * To...
1948
Mahdi Osman
m_osm@...
Mar 14, 2005 8:29 am
I have not used SAS for a while thanks to R, but I know that R's "spatial" library will do a good job in trend surface analysis. If you are using R, you could...
1949
Chunhua Zhang
chz939@...
Mar 14, 2005 8:30 am
Hello list, I want to know how to conduct trend surface analysis in SAS. I tried regression model and it seems it is not the right model. Will GLM work? Many...
1950
Monica Rivas-Casado
m.rivas-casado.s03@...
Mar 16, 2005 9:49 am
Hi Koen, The following papers where useful to me (you can get some ideas from there). Hope this is helpful: Collins, J.B.& Woodcock, C.E. "Geostatistical...
1951
Koen Hufkens
koen.hufkens@...
Mar 16, 2005 9:49 am
Hi list, I'm looking for some good books/papers/articles about geostatistical approaches for evaluating scaling effects in remote sensing? Does anyone have any...
1952
Koen Hufkens
koen.hufkens@...
Mar 17, 2005 9:11 am
Hi list, I've some questions about wavelet analysis. As I may quote: "...it identifies the intensity of pattern and the scale(s) at which this is expressed....
1953
Chris Hlavka
chlavka@...
Mar 17, 2005 9:11 am
Re : Use of discriminant analysis: You might try quadratic disciminant analysis, wherein differences among variances and covariances are taken into account....
1954
Mahdi Osman
m_osm@...
Mar 17, 2005 9:11 am
Hi, Martinez, It seems to me that you are analysing coded categorical variables (eg. soft = 1, coarse = 2, hard = 3 etc.). I also assume that your coding is...
1955
MARTINEZ VARGAS Adrian
martinez@...
Mar 17, 2005 9:11 am
hello mail list I have a categorical variable that describe rock type and I'm interesting in quantify the relation and discriminant capacity of continuous...
1956
gpezzuchi@...
Mar 21, 2005 8:38 am
Hi all: Sorry to disturb with a different question, I was wondering if anyone could point out some good references on multilevel modeling within a spatial ...
1957
Perry Collier
PCollier@...
Mar 23, 2005 10:27 am
Hi all from Oz (Australia) First post on this list. I am a mine geo currently doing some post-grad geostats study (Edith Cowan Uni in WA, hi Dr Ute, Prof....
1958
Mahdi Osman
m_osm@...
Mar 23, 2005 10:27 am
Hi, list, Sorry to bother you with my question. I have got a very large dataset with geographic coordinates documented in 'degrees and minutes'. As the data is...
1959
Els Verfaillie
els.verfaillie@...
Mar 23, 2005 10:28 am
Hi list, I want to do ordinary kriging with an anisotropic variogram with GSLIB. My variogram is an exponential model with a practical range of 1800 m in ...
1960
Digby Millikan
digbym@...
Mar 23, 2005 10:28 am
bi-Gaussian assumption for non-mathematiciansPerry, I am not familair with simulation, but your post would be a good starting point for discussion, I assume...
1961
Lucy Roberts
lucy.roberts@...
Mar 23, 2005 10:32 am
Hi Perry (from just down the road at JCU Townsville!) A few references I have found useful are: Rivoirard, J. (1994) Introduction to Disjunctive Kriging and...
