nztrees: New Zealand Trees Point Pattern
In spatstat.data: Datasets for 'spatstat' Family
nztrees R Documentation
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.
Usage
data(nztrees)
Format
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.
Note
To trim a 5-foot margin off the window, type
nzsub <- nztrees[owin(c(0,148),c(0,95)) ]
Source
Mark and Esler (1970), Ripley (1981).
References
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.
spatstat.data documentation built on May 29, 2024, 9:10 a.m.
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| nztrees | R Documentation |
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.
Usage
data(nztrees)Format
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.
Note
To trim a 5-foot margin off the window, type
nzsub <- nztrees[owin(c(0,148),c(0,95)) ]
Source
Mark and Esler (1970), Ripley (1981).
References
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.
R Package Documentation
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We want your feedback!
Note that we can't provide technical support on individual packages. You should contact the package authors for that.
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