An Object-oriented Framework for Geostatistical Modeling in S+ containing functions for variogram estimation, variogram fitting and kriging as well as some plot functions. Written entirely in S, therefore works only for small data sets in acceptable computing time.
This is a R port of:
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An Object-oriented Framework for Geostatistical Modeling in S+
James J. Majure
Iowa State University
Geographic Information Systems
Support and Research Facility
email: majure@iastate.edu
WWW: http://www.gis.iastate.edu/SGeoStat/homepage.html
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ported to R:
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Albrecht Gebhardt email: albrecht.gebhardt@uni-klu.ac.at
Institut fuer Mathematik Tel. : (++43 463) 2700/837
Universitaet Klagenfurt Fax : (++43 463) 2700/834
Villacher Str. 161 WWW : http://www-stat.uni-klu.ac.at/~agebhard
A-9020 Klagenfurt, Austria
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with contributions from
Roger Bivand <rsb@reclus.nhh.no>
Department of Geography
Norwegian School of Economics and Business Administration
Bergen, Norway
For notes regarding the licensing (GPL 2.0) see the end of this file.
Differences to the original distribution:
+ I added the functions fit.gaussian() and fit.spherical() similiar to
fit.exponential().
+ fit.variogram() is a call wrapper for the different variogram fitting
procedures.
+ which.na() included for R <-> S compatibility.
+ plot.point() changed: legend.pos parameter added.
+ The function variogram() (for variogram estimation) has been renamed to
est.variogram() to avoid name conflicts (in the html help system) with the
variogram() function from library(spatial) (in Venables/Ripley).
+ Because of the lack of a persp() plot function in R, I changed calls to it
(in fit.trend()) to contour().
+ I added a dataset "maas" which originally belongs to "gstat", a geostatistics
package from E.J Pebesma (E.J.Pebesma@frw.uva.nl) available at
http://www.frw.uva.nl/~pebesma/gstat/
with measurements of zinc as a groundwater quality variable. Details can be
found at the URL above, e.g. a GIF-picture (zn_map.gif) with coordinates (it
is also included here).
The dataset "maas.bank" contains coordinates of the maas bank, shown in
zn_map.gif. I produced these coordinates by "digitizing" this GIF picture in
a rather simple way: I created a drawing with tgif overlaying the imported
gif, exported this drawing in a postscript file and scaled the resulting
postscript coordinates according to the border of the picture. So the quality
is rather poor. The files maas.dig and digi.R are related to this procedure.
+ The help pages stem from the original HTML help at
http://www.gis.iastate.edu/SGeoStat/homepage.html
More differences: see ChangeLog file
Some notes regarding the license:
This package is under GPL version 2 or newer.
Maintainer:
Albrecht Gebhardt <albrecht.gebhardt@aau.at>
Author:
James J. Majure <majure@iastate.edu> Iowa State University
The Original was public available from 1995 to 2006 (according to the records at
http://web.archive.org) at:
http://www.gis.iastate.edu/SGeoStat/homepage.html
and seems to have vanished due to website restructuring.
In earlier versions (before 1.0-26) this archive contained a subdirectory
www-SGeoStat/ which contained a mirror of that site, also available at
http://web.archive.org/web/*/http://www.gis.iastate.edu/SGeoStat/homepage.html.
If you are interested in this please grab an older source package from the CRAN
archives.
The original was written by S. Majure and intended for use wit S-Plus.
The original version contains no Copyright statements and no details about
redistributability, neither in the code nor on the web pages. Due to the fact
of the (former) public availability, together with the obvious intention of the
original author that users should download and use this software (Downloading and
Installation instructions) it can be assumed that the code is under public
domain and therefore can be relicensed under GPL.
So starting with version 1.0-25 this package is under GPL version 2 or newer.
Small parts have been added to the original code and are also licensed under
GPL version 2 or newer, for details see README file.
Albrecht Gebhardt <albrecht.gebhardt@aau.at>