Extract the pixel values of a pixel image at each point along
 a linear transect.

transect.im

Functionality for exploratory data analysis and nonparametric analysis of
spatial data, mainly spatial point patterns,
in the 'spatstat' family of packages.
(Excludes analysis of spatial data on a linear network,
which is covered by the separate package 'spatstat.linnet'.)
Methods include quadrat counts, K-functions and their simulation envelopes, 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, and kernel estimates of covariate effects. Formal hypothesis tests of random pattern (chi-squared, Kolmogorov-Smirnov, Monte Carlo, Diggle-Cressie-Loosmore-Ford, Dao-Genton, two-stage Monte Carlo) and tests for covariate effects (Cox-Berman-Waller-Lawson, Kolmogorov-Smirnov, ANOVA) are also supported.

Adrian Baddeley

spatstat.explore

Exploratory Data Analysis for the 'spatstat' Family

Rolf Turner

Ege Rubak

Kasper Klitgaard Berthelsen

Warick Brown

Achmad Choiruddin

Ya-Mei Chang

Jean-Francois Coeurjolly

Lucia Cobo Sanchez

Ottmar Cronie

Tilman Davies

Julian Gilbey

Jonatan Gonzalez

Yongtao Guan

Ute Hahn

Martin Hazelton

Kassel Hingee

Abdollah Jalilian

Frederic Lavancier

Marie-Colette van Lieshout

Greg McSwiggan

Robin K Milne

Tuomas Rajala

Suman Rakshit

Dominic Schuhmacher

Rasmus Plenge Waagepetersen

Hangsheng Wang

Tingting Zhan

transect.im function

Pixel Values Along a Transect — transect.im

<dl>

 <dt>X</dt>
<dd>A pixel image (object of class <code>"im"</code>).</dd>

 <dt>...</dt>
<dd>Ignored.</dd>

 <dt>from,to</dt>
<dd>Optional. Start point and end point of the transect.
 Pairs of \((x,y)\) coordinates
 in a format acceptable to <code><a href='https://rdrr.io/r/grDevices/xy.coords.html'>xy.coords</a></code>,
 or keywords <code>"bottom"</code>, <code>"left"</code>, <code>"top"</code>,
 <code>"right"</code>, <code>"bottomleft"</code> etc.</dd>

 <dt>nsample</dt>
<dd>Integer. Number of sample locations along the transect.</dd>

 <dt>click</dt>
<dd>Optional.
 Logical value.
 If <code>TRUE</code>, the linear transect is determined interactively
 by the user, who clicks two points on the current plot.</dd>

 <dt>add</dt>
<dd>Logical. If <code>click=TRUE</code>, this argument determines
 whether to perform interactive tasks on the current plot (<code>add=TRUE</code>)
 or to start by plotting <code>X</code> (<code>add=FALSE</code>).</dd>

 <dt>curve</dt>
<dd>Optional. A specification of a curved transect. See the section
 on Curved Transect.</dd>

</dl>

Arguments

If <code>curve</code> is given, then the transect will be a curve.
 The argument <code>curve</code> should be a list with the following
 arguments:<dl>
 <dt>f</dt>
<dd>A function in the R language with one argument <code>t</code>.</dd>

 <dt>tlim</dt>
<dd>A numeric vector of length 2 giving the range of values
 of the argument <code>t</code>.</dd>

 <dt>tname</dt>
<dd>(Optional) a character string giving the symbolic name
 of the function argument <code>t</code>; defaults to <code>"t"</code>.</dd>

 <dt>tdescrip</dt>
<dd>(Optional) a character string giving a short
 description of the function argument <code>t</code>; defaults to
 <code>"curve parameter"</code>.</dd>

 
</dl>The function <code>f</code> must return a 2-column matrix or data frame
 specifying the spatial coordinates <code>(x,y)</code> of locations along the
 curve, determined by the values of the input argument <code>t</code>.

Curved Transect

Adrian Baddeley <a href='mailto:Adrian.Baddeley@curtin.edu.au'>Adrian.Baddeley@curtin.edu.au</a>
 and Rolf Turner <a href='mailto:rolfturner@posteo.net'>rolfturner@posteo.net</a>

Author

Pixel Values Along a Transect

transect.im: Pixel Values Along a Transect

Description

Usage

Arguments

Value

Details

See Also

Examples