get_boundary_polygons

Used by <code>get_correction_factors</code> to convert a boundary table
to polygons. You may want to see the polygons, that is why we exported this
function.

The German national forest inventory uses angle count sampling,
a sampling method first published as `Bitterlich, W.: Die Winkelzählmessung.
Allgemeine Forst- und Holzwirtschaftliche Zeitung, 58. Jahrg., Folge 11/12
vom Juni 1947` and extended by Grosenbaugh
(<https://academic.oup.com/jof/article-abstract/50/1/32/4684174>)
as probability proportional to size sampling.
When plots are located near stand boundaries, their sizes and hence
their probabilities need to be corrected.

Andreas Dominik Cullmann

treePlotArea

Correction Factors for Tree Plot Areas Intersected by Stand
Boundaries

Bernhard Bösch

Christoph Fischer

Gerald Kändler

get_boundary_polygons function

<dl><dt>boundaries</dt>
<dd>A <code><a href="/link/data.frame?package=treePlotArea&version=3.1.0" data-mini-rdoc="treePlotArea::data.frame">data.frame</a></code> containing boundaries.
It has to have columns named by the contents of
either 
<code>get_defaults()[["boundaries"]]</code> or 
<code>getOption("treePlotArea")[["boundaries"]]</code>. 
Could be
<code>get(data("boundaries", package = "treePlotArea"))</code> or the
output of
<code>get_boundary_polygons</code>.</dd>
<dt>stop_on_error</dt>
<dd>Throw an error if invalid boundaries are encountered?
(There was tract 6878, corner 1, boundary 1 in the federal
database for the 2012 survey, runs through the plot.
There is no stand defined that way!).</dd>
<dt>clean_data</dt>
<dd>Omit invalid boundaries in any further calculations?</dd>
<dt>counting_factor</dt>
<dd>The basal area factor used in counting the trees. For
tally trees in the German national forest inventory its value is 4 [m^2].</dd></dl>

Arguments

Convert Boundaries to Polygons — get_boundary_polygons

<dl>

<dt>boundaries</dt>
<dd>A <code><a href='https://rdrr.io/r/base/data.frame.html'>data.frame</a></code> containing boundaries.
It has to have columns named by the contents of
either 
<code>get_defaults()[["boundaries"]]</code> or 
<code>getOption("treePlotArea")[["boundaries"]]</code>. 
Could be
<code>get(data("boundaries", package = "treePlotArea"))</code> or the
output of
<code>get_boundary_polygons</code>.</dd>


<dt>stop_on_error</dt>
<dd>Throw an error if invalid boundaries are encountered?
(There was tract 6878, corner 1, boundary 1 in the federal
database for the 2012 survey, runs through the plot.
There is no stand defined that way!).</dd>


<dt>clean_data</dt>
<dd>Omit invalid boundaries in any further calculations?</dd>


<dt>counting_factor</dt>
<dd>The basal area factor used in counting the trees. For
tally trees in the German national forest inventory its value is 4 [m^2].</dd>

</dl>

get_boundary_polygons: Convert Boundaries to Polygons

Description

Usage

Value

Arguments

See Also

Examples