This is a R port of: ############################################################################## 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 ############################################################################## ported to R: ------------------------------------------------------------------------------ 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 ------------------------------------------------------------------------------ with contributions from Roger Bivand 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 Author: James J. Majure 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