longleaf

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 (<code>dbh</code>), a convenient measure of its size. 
 Several analyses have considered only the ``adult'' trees which
 are conventionally defined as those trees with <code>dbh</code>
 greater than or equal to 30 cm.
 
 The pattern is regarded as spatially inhomogeneous.

datasets

spatial

A package for analysing spatial data,
	mainly Spatial Point Patterns,
	including multitype/marked points and spatial covariates,
	in any two-dimensional spatial region.
	Contains functions for exploratory data analysis,
	model-fitting, simulation, spatial sampling, model diagnostics,
	and formal inference. Data types include point patterns,
	line segment patterns, spatial windows, and
	pixel images. Point process models can be
	fitted to point pattern data. Cluster type models are fitted
	by the method of minimum contrast. Very general Gibbs point
	process models can be fitted to point pattern data
	using a function ppm similar to lm or glm. Models may
	include dependence on covariates, interpoint interaction
	and dependence on marks. Fitted models can be simulated automatically.
	Also provides facilities for formal inference (such as chi-squared
	tests) and model diagnostics (including simulation
	envelopes, residuals, residual plots and Q-Q plots).

Adrian Baddeley

spatstat

Spatial Point Pattern analysis, model-fitting, simulation, tests

longleaf function

An object of class <code>"ppp"</code>
 representing the point pattern of tree locations.
 Entries include
 <tabular>ll</tabular>{
 <code>x</code> 	Cartesian $x$-coordinate of tree <code>y</code> 	Cartesian $y$-coordinate of tree <code>marks</code> 	diameter at breast height, in centimetres.
 }
 See <code><a href="/link/ppp.object?package=spatstat&version=1.11-4" rd-options="" data-mini-rdoc="spatstat::ppp.object">ppp.object</a></code> for details of the format of a
 point pattern object.

longleaf: Longleaf Pines Point Pattern

Description

Usage

Arguments

format

source

References