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.
An object of class "ppp"
representing the point pattern of tree locations.
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.
Platt, Evans and Rathbun (1988)
Platt, W. J., Evans, G. W. and Rathbun, S. L. (1988)
The population dynamics of a long-lived Conifer (Pinus palustris).
The American Naturalist131, 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 Association89, 1164--1173.