Rdistance (version 3.1.4)
Distance-Sampling Analyses for Density and Abundance Estimation
Description
Distance-sampling analyses ()
estimate density and abundance of survey targets (e.g., animals) when
detection declines with distance. Distance-sampling is popular 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. Both point and line transects can be analyzed. Outputs
include overall (study area) density and abundance, effective sampling
distances, and model fit statistics. A large suite of classical, parametric
detection functions (e.g., half-normal, hazard rate) is included along
with uncommon parametric functions (e.g., Gamma, negative exponential).
Non-parametric smoothed distance functions are included. Measurement unit
integrity is enforced via internal unit conversion. The help files and
vignettes have been vetted by multiple authors and tested in workshop
settings.