New Zealand Trees Point Pattern
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.
data(nztrees)
An object of class "ppp"
representing the point pattern of tree locations.
The Cartesian coordinates are in feet.
See ppp.object for details of the format of a
point pattern object.
To trim a 5-foot margin off the window, type
nzsub <- nztrees[owin(c(0,148),c(0,95)) ]
Mark and Esler (1970), Ripley (1981).
Ripley, B.D. (1981) 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. Proceedings of the New Zealand Ecological Society 17, 106–110.
Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.