nztrees

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.

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. Also
        supports three-dimensional point patterns, and space-time point
        patterns in any number of dimensions.  Contains over 1000
        functions for plotting spatial data, exploratory data analysis,
        model-fitting, simulation, spatial sampling, model diagnostics,
        and formal inference.  Data types include point patterns, line
        segment patterns, spatial windows, pixel images and
        tessellations.  Exploratory methods include K-functions,
        nearest neighbour distance and empty space statistics, Fry
        plots, pair correlation function, kernel smoothed intensity,
        relative risk estimation with cross-validated bandwidth
        selection, mark correlation functions, segregation indices,
        mark dependence diagnostics etc.  Point process models can be
        fitted to point pattern data using functions ppm, kppm, slrm
        similar to glm. Models may include dependence on covariates,
        interpoint interaction, cluster formation 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

nztrees function

An object of class <code>"ppp"</code>
 representing the point pattern of tree locations.
 The Cartesian coordinates are in feet. See <code><a href="/link/ppp.object?package=spatstat&version=1.31-3" rd-options="" data-mini-rdoc="spatstat::ppp.object">ppp.object</a></code> for details of the format of a
 point pattern object.

format

source

To trim a 5-foot margin off the window, type
 <code>nzsub &lt;- nztrees[ , owin(c(0,148),c(0,95)) ]</code>

nztrees: New Zealand Trees Point Pattern

Description

Usage

Arguments

format

source

Note

References