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Rdistance
contains two example datasets, i.e., sparrow.detections
and sparrow.transects
. 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. Only the data in sparrow.detections
is needed to fit a detection function (see F.dfunc.estim
), but both sparrow.detections
and sparrow.transects
are needed to estimate abundance (see F.abund.estim
).
Data come from 72 transects, each 500 meters long, surveyed for sparrows by the Wyoming Cooperative Fish & Wildlife Research Unit. Observers recorded the sighting distance and sighting angle to each sparrow group detected.
See the package vignettes for an Rdistance
tutorial using these datasets.sparrow.detections
siteID
: Factor, the site or transect where the detection was made.groupsize
: Number, the number of individuals within the detected group.sightdist
: Number, the distance from the observer to the detected group.sightangle
: Number, the angle (in degrees) from the transect line to the detected group.sparrow.transects