659AI-GEOSTATS: responses to "user-defined distance matrix"
- Jun 27, 2002Hi,
I just wanted to share some of the responses to my question about
substituting a user-defined distance matrix into a program for variogram
calculation and kriging:
I'm looking for software or a script(Mathcad, Splus, SAS, etc.) for
variogram estimation and kriging that can be easily altered to accept a
user-defined distance matrix. I would like to substitute a distance matrix
into the program rather than having it automatically calculate the Euclidean
distance. I'm flexible about the language/platform but I'd like to find
something that can handle a large (2000x2000) distance matrix with relative
speed. Any advice would be greatly appreciated.
1) Modify a function in the Geostokos (commercial) software package.
2) Modify the BMELIB toolbox (freeware) for Matlab
3) Search the contributed packages page on the R website (www.r-project.org)
4) Modify gstat (freeware) written in C
I haven't found any software that allows you to easily plug in a
distance matrix. Most programs calculate distances internally. I've taken
some existing routines in Matlab for variogram calculation and altered them
to accept a distance matrix. This was fairly easy. The harder part is
altering the kriging routines. I chose Matlab for Unix because it seems to
handle these large matrices and long loops pretty efficiently. Thanks to
everyone who wrote in with suggestions.
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