sparrowDetectionData

Detection data from line transect surveys for 
Brewer's sparrow on 72 transects 
located on a 4105 km^2 study 
area in central Wyoming. Data were collected by 
Dr. Jason Carlisle of the Wyoming Cooperative Fish &amp; Wildlife
Research Unit in 2012. Each transect was 500 meters long.
See the package vignettes for tutorials of the basic analysis.

datasets

Distance-sampling analyses estimate density and
abundance of organisms in ecology when detection probability declines with
increasing distance from the observers. Distance-sampling is popular
in most branches of ecology and especially when
organisms are observed from aerial platforms (e.g., airplane or drone),
surface vessels (e.g., boat or truck), or along walking transects.
Rdistance analyzes data collected on both point and line transects,
estimates overall (study area) and site-level (transect or point)
density, and allows users to specify regression-like formula (similar
to lm or glm) for covariates. A large suite of classical,
parametric detection functions are
included along with some uncommon parametric
functions (e.g., Gamma, negative exponential) and non-parametric
smoothed distance functions. Custom (user-defined) detection functions
can be implemented (see vignette).  Measurement unit integrity is
enforced with internal unit conversion when necessary.
The help files and vignettes have been
vetted by multiple authors and tested in workshop
settings.

Trent McDonald

Rdistance

Distance-Sampling Analyses for Density and Abundance Estimation

Jason Carlisle

Aidan McDonald

Ryan Nielson

Ben Augustine

James Griswald

Patrick McKann

Lacey Jeroue

Hoffman Abigail

Kleinsausser Michael

Joel Reynolds

Pham Quang

Earl Becker

Aaron Christ

Brook Russelland

Stefan Emmons

Will McDonald

Reid Olson

sparrowDetectionData function

A data.frame containing 356 rows and 5 columns. Each row represents
a detected group of sparrows. Column descriptions:<ol>
<li><code>siteID</code>: Factor (72 levels), the site or transect where the detection
 was made.</li>
<li><code>groupsize</code>: Number, the number of individuals within
 the detected group.</li>
<li><code>sightdist</code>: Number, distance (m) from the observer to the detected group.</li>
<li><code>sightangle</code>: Number, the angle (degrees) from the transect 
 line to the detected group.</li>
<li><code>dist</code>: Number, the perpendicular, off-transect distance (m) from the
 transect to the detected group. This is the distance used in analysis.
 Calculated using <code>perpDists</code>.</li>
</ol>

Format

Brewer's Sparrow detection data — sparrowDetectionData

Brewer's Sparrow detection data

sparrowDetectionData: Brewer's Sparrow detection data

Description

Arguments

Format

References

See Also