Dear Steinar, you can use so-called qualitative or semi-quantitative modelling approaches. In such environments it is possible to define functions (varibles)...
Jul The warning about kriging small blocks is about "small" relative to the sampling density. For example, less than about one-third of the grid spacing. The...
Hello Syed, I was hoping a reply from you :) I didn't think about the problematic of anisotropy and the potential use of ratios of fractal dimensions. It might...
I have been surfing the internet and looking through a few older spatial spatistics books and could not find any recommendations on minimum sample size for...
Hi, Dear List: I am trying to use Gstat to do Gaussian Conditional Simulation on my soil C content data. I got 3 questions as following: 1. If I use "set...
All, I just wondering why kriging small blocks is warned. Any literature about this subject will be appreciated. Thanks. Regards, Jul * By using the...
Hi All, I am at the beginning of modelling fluvial sand channels using subsurface well data (logs &cores). I would appreciate if you could send me some tips on...
Hi, I am wondering if anybody knows about any software that will implement the new Ord-Getis O statistics for local spatial autocorrelation identification when...
Hi there, I have a couple of question. One, What is SEM (Structural Equation Model) and how to apply it on a dataset and what is difference between SEM and...
Dear All, Are there any rules help building stable variograms, like number of lags, range ..etc? And what is the minimum number of control points needed to ...
Salah If your data is irregularly spaced, then you need to experiment with 'lag' intervals to balance between (a) getting enough points to see the shape of the...
List: In COKB3D in GSLIB there is a line specifying the max search radii for the secondary variable(s) in cokriging. In both the Stanford and www;gslib.com ...
Hi- I was going to do a cokriging cross validation using gslib77 and can download the source from at least two places. http://www.gslib.com/main_gd.html or ...
Dear Colleagues Collection of digital elevation data in dam reservoir bathemetry is rich (i.e., 1 m) along the transect while it will be poor (in terms of...
I have strength data from a circular column of soil which has been treated by mixing in lime using a rotary tool. Is there any way in which I can work in polar...
Hi all, I am working on my Master's thesis, the major part of which is consists of GWR (Geographically Weighted Regression). I wonder if someone is working or...
Dear all, I've got a set of points at unknown elevation heights within a DEM. These points fall within a dense 5m resolution DEM, with an elevation point at...
hi i have used the sequencial simulation in GSLIB software. i have got the output from that option. but how i know that the result is ok or not? i have used 3...
Hi Marc, You may want to look at the following paper: de Gruijter, J.J., Walvoort, D.J.J., van Gaans, P.F.M., 1997. Continuous soil maps --- a fuzzy set...
Marc-Olivier The simplest solution - in the sense that most packages could handle it - is to carry out a 'nested' indicator analysis. That is: (i) code one of...
hi i am facing problem to draw variogram for the limestone deposit. i have very positively skewed data set. earlier i had send one mail regarding this issue....
Due to the changes made at the level of the listserver, mails sent after the 26th of April have not been archived here. This problem should be fixed now. I am...
Dear ALL Recently I am interested in multi-dimension data visulization. Do anybody konw any free software or commercial package which can generate RadViz...
Helo List, I have one more request: Maybe some one can recommend free software for median polish kriging (maybe i'm wrong but GSTAT software and R system not...
Hello lists, I have a question: I am now interested in heterogeneity. Heterogeneity is related to pattern and pattern is absence of randomness. Many indices...
Trend surface analysis is simply basic linear regression with your measured variable as the 'dependent' and your co-ordinates (and polynomials of) as your...
Hello list, I have read a thesis where the author consider the matrix W=1-Dij/max(Dij) (Dij is the distance between site i and j) as a spatial weight matrix...
