Brewer's Sparrow detection data (line-transect survey)
Rdistance contains four example datasets: two collected using a
line-transect survey (i.e.,
sparrowSiteData) and two collected using a point-transect
(sometimes called a point count) survey (i.e.,
These datasets demonstrate the type and format of input data required by
Rdistance to estimate a detection function and abundance from
distance sampling data collected by surveying line transects or point
transects. They also allow the user to step through the tutorials described
in the package vignettes. Only the detection data is needed to fit a
detection function (if there are no covariates in the detection function;
dfuncEstim), but both detection and
the additional site data are needed to estimate abundance (or to include
site-level covariates in the detection function; see
Line transect (sparrow) data come from 72 transects, each 500 meters long, surveyed for Brewer's Sparrows by the Wyoming Cooperative Fish & Wildlife Research Unit in 2012.
Point transect (thrasher) data come from 120 points surveyed for Sage Thrashers by the Wyoming Cooperative Fish & Wildlife Research Unit in 2013.
See the package vignettes for
Rdistance tutorials using these
A data.frame containing 356 rows and 5 columns. Each row represents a detected group of sparrows. Column descriptions:
siteID: Factor (72 levels), the site or transect where the detection
groupsize: Number, the number of individuals within
the detected group.
sightdist: Number, the distance (m) from
the observer to the detected group.
sightangle: Number, the
angle (degrees) from the transect line to the detected group.
dist: Number, the perpendicular, off-transect distance (m) from the
transect to the detected group. This is the distance used in analysis.
A subset of Jason Carlisle's dissertation data, University of Wyoming.
Carlisle, J.D. 2017. The effect of sage-grouse conservation on wildlife species of concern: implications for the umbrella species concept. Dissertation. University of Wyoming, Laramie, Wyoming, USA.
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