polyarea

Area of a single closed polygon (simple x-y coordinate input) or of
multiple polygons, possibly with holes.

Functions to estimate the density and size of a spatially
distributed animal population sampled with an array of passive detectors,
such as traps, or by searching polygons or transects. Models incorporating
distance-dependent detection are fitted by maximizing the likelihood.
Tools are included for data manipulation and model selection.

Murray Efford

secr

Spatially Explicit Capture-Recapture

Philipp Jund

David Fletcher

Yan Ru Choo

polyarea function

<dl> <dt>xy</dt>
<dd>dataframe or list with components `x' and `y', or a
 SpatialPolygons or SpatialPolygonsDataFrame object from package sp, or an sf object with polygon data</dd> <dt>ha</dt>
<dd>logical if TRUE output is converted from square metres to hectares</dd></dl>

Arguments

Area of Polygon(s) — polyarea

<dl>

 <dt>xy</dt>
<dd>dataframe or list with components `x' and `y', or a
 SpatialPolygons or SpatialPolygonsDataFrame object from package sp, or an sf object with polygon data</dd>

 <dt>ha</dt>
<dd>logical if TRUE output is converted from square metres to hectares</dd>

</dl>

polyarea: Area of Polygon(s)

Description

Usage

Value

Arguments

Details

See Also

Examples