Brewer's Sparrow site 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 72 rows and 8 columns. Each row represents a site (transect) surveyed. Column descriptions:
siteID: Factor (72 levels), the site or transect surveyed.
length: Number, the length (m) of each transect. Use the same units
for all distance measurements.
observer: Factor (five levels),
identity of the observer who surveyed the transect.
Number, the mean bare ground cover (%) within 100 m of each transect.
herb: Number, the mean herbaceous cover (%) within 100 m of
shrub: Number, the mean shrub cover (%) within
100 m of each transect.
height: Number, the mean shrub height
(cm) within 100 m of each transect.
shrubclass: Factor (two
levels), class is "Low"" when shrub cover is < 10%, "High" otherwise.
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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