https://github.com/cran/spatstat
Tip revision: 56d752cf6d1a8e2775e1acc46482c206cfd5b269 authored by Adrian Baddeley on 14 March 2012, 07:09:51 UTC
version 1.25-5
version 1.25-5
Tip revision: 56d752c
nztrees.Rd
\name{nztrees}
\alias{nztrees}
\docType{data}
\title{
New Zealand Trees Point Pattern
}
\description{
The data give the locations of trees in a forest plot.
They were collected by Mark and Esler (1970) and
were extracted and analysed by Ripley (1981, pp. 169-175).
They represent the
positions of 86 trees in a forest plot approximately 140 by 85 feet.
Ripley discarded from his analysis the eight trees at the right-hand edge of
the plot (which appear to be part of a planted border)
and trimmed the window by a 5-foot margin accordingly.
}
\format{
An object of class \code{"ppp"}
representing the point pattern of tree locations.
The Cartesian coordinates are in feet.
See \code{\link{ppp.object}} for details of the format of a
point pattern object.
}
\usage{data(nztrees)}
\source{Mark and Esler (1970), Ripley (1981).}
\section{Note}{
To trim a 5-foot margin off the window, type
\code{nzsub <- nztrees[ , owin(c(0,148),c(0,95)) ]}
}
\references{
Ripley, B.D. (1981)
\emph{Spatial statistics}.
John Wiley and Sons.
Mark, A.F. and Esler, A.E. (1970)
An assessment of the point-centred quarter method of plotless
sampling in some New Zealand forests.
\emph{Proceedings of the New Zealand Ecological Society}
\bold{17}, 106--110.
}
\keyword{datasets}
\keyword{spatial}