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.

datasets

Distance-sampling (<doi:10.1007/978-3-319-19219-2>)
estimates density and abundance of survey targets (e.g., animals) when
detection probability declines with distance.
Distance-sampling is popular in ecology,
especially when survey targets are observed from aerial platforms (e.g.,
airplane or drone), surface vessels (e.g., boat or truck), or along
walking transects.
Distance-sampling includes line-transect studies that measure observation
distances as the closest approach of the sample route (transect) to the target
(i.e., perpendicular off-transect distance), and point-transect studies that
measure observation distances from stationary observers to
the target (i.e., radial distance).
The routines included here fit smooth (parametric) curves to
histograms of observation distances
and use those functions to compute effective sampling distances, density of
targets in the surveyed area, and abundance
of targets in a surrounding study area. Curve shapes include the
half-normal, hazard rate, and negative exponential functions.
Physical measurement units are required and used throughout to
ensure density is reported correctly. The help files
are extensive and have been vetted by multiple authors.

Trent McDonald

Rdistance

Density and Abundance from Distance-Sampling Surveys

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