longleaf
Longleaf Pines Point Pattern
Locations and sizes of Longleaf pine trees. A marked point pattern.
The data record the locations and diameters of
584 Longleaf pine (Pinus palustris) trees
in a 200 x 200 metre region in southern Georgia (USA).
They were collected and analysed by Platt, Evans and Rathbun (1988).
This is a marked point pattern; the mark associated with a tree is its
diameter at breast height (dbh), a convenient measure of its size.
Several analyses have considered only the ``adult'' trees which
are conventionally defined as those trees with dbh
greater than or equal to 30 cm.
The pattern is regarded as spatially inhomogeneous.
- Keywords
- datasets
Usage
data(longleaf)format
An object of class "ppp"
representing the point pattern of tree locations.
Entries include
x Cartesian $x$-coordinate of tree
y Cartesian $y$-coordinate of tree
marks diameter at breast height, in centimetres.
}
See ppp.object for details of the format of a
point pattern object.
source
Platt, Evans and Rathbun (1988)
References
Platt, W. J., Evans, G. W. and Rathbun, S. L. (1988) The population dynamics of a long-lived Conifer (Pinus palustris). The American Naturalist 131, 491--525.
Rathbun, S. L. and Cressie, N. (1994) A space-time survival point process for a longleaf pine forest in southern Georgia. Journal of the American Statistical Association 89, 1164--1173.