\HeaderA{meuse}{Meuse river data set}{meuse}
\keyword{datasets}{meuse}
\begin{Description}\relax
This data set gives locations and top soil heavy metal concentrations
(ppm), along with a number of soil and landscape variables, collected in
a flood plain of the river Meuse, near the village Stein. Heavy metal
concentrations are bulk sampled from an area of approximately 15 m
x 15 m.
\end{Description}
\begin{Usage}
\begin{verbatim}
data(meuse)
\end{verbatim}
\end{Usage}
\begin{Format}\relax
This data frame contains the following columns:
\describe{
\item[x] a numeric vector; x-coordinate (m)
in RDM (Dutch topographical map coordinates) 
\item[y] a numeric vector; y-coordinate (m)
in RDM (Dutch topographical map coordinates)
\item[cadmium] topsoil cadmium concentration, ppm.; note that zero cadmium
values in the original data set have been shifted to 0.2 (half the lowest 
non-zero value) 
\item[copper] topsoil copper concentration, ppm. 
\item[lead] topsoil lead concentration, ppm. 
\item[zinc] topsoil zinc concentration, ppm.  
\item[elev] relative elevation
\item[dist] distance to river Meuse; obtained from the nearest cell in
\LinkA{meuse.grid}{meuse.grid}, which in turn was derived by a spread (spatial distance)
GIS operation, therefore it is accurate up to 20 metres; 
normalized $[0,1]$ 
\item[om] organic matter, as percentage 
\item[ffreq] flooding frequency class
\item[soil] soil type
\item[lime] lime class
\item[landuse] landuse class
\item[dist.m] distance to river Meuse (metres), as obtained during
the field survey
}
\end{Format}
\begin{Note}\relax
row.names refer to the original sample number
\end{Note}
\begin{Author}\relax
\end{Author}
\begin{References}\relax
P.A. Burrough, R.A. McDonnell, 1998. Principles of Geographical Information
Systems. Oxford University Press.

\url{http:/www.gstat.org/}
\end{References}
\begin{Examples}
\begin{ExampleCode}
data(meuse)
summary(meuse)
\end{ExampleCode}
\end{Examples}

