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dwp

Estimating the number of birds or bats killed at a wind power facility involves adjusting observed carcass counts to account for imperfect detection. To account for carcasses that lie outside the searched area, the count is adjusted by dividing by the estimated proportion of carcasses lying within the searched area or the density-weighted proportion (dwp). The dwp package provides tools for estimating dwp for use in mortality estimators such as GenEst (Dalthorp et al. 2018) and Evidence of Absense (Dalthorp et al. 2017).

DISCLAIMER

12345678901234567890123456789012345678901234567890123456789012345678901234567890 Version 1.0 of the software has been approved for release by the U.S. Geological Survey (USGS). Although the software has been subjected to rigorous review, the USGS reserves the right to update the software as needed pursuant to further analysis and review. No warranty, expressed or implied, is made by the USGS or the U.S. Government as to the functionality of the software and related material nor shall the fact of release constitute any such warranty. Furthermore, the software is released on condition that neither the USGS nor the U.S. Government shall be held liable for any damages resulting from its authorized or unauthorized use.

Minor modifications and bug fixes in subsequent versions have not reviewed by USGS.

Revisions:

v1.1 Method for estimating the area searched in each ring has been updated. The new method does not rely on gpclib::area.poly, which is no longer available on CRAN. It estimates the area searched in each ring by averaging the arc lengths of the intersections of the inner and outer ring boundaris with the search polygon.

Further Reading

dwp User Guide: Daniel Dalthorp, Manuela Huso, Mark Dalthorp, Jeff Mintz Accounting for the Fraction of Carcasses outside the Searched Area and the Estimation of Bird and Bat Fatalities at Wind Energy Facilities https://arxiv.org/abs/2201.10064

Dalthorp, D, Simonis, J, Madsen, L, Huso, M, Rabie, P, Mintz, J, Wolpert, R, Studyvin, J, and Korner-Nievergelt, F. 2018. R package. GenEst: Generalized Mortality Estimator. https://CRAN.R-project.org/package=GenEst

Dalthorp, D, Huso, M, Dail, D, and Kenyon, J. 2017. Evidence of Absence (v2.0) Software and user Guide. https://pubs.er.usgs.gov/publication/ds1055

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Version

Install

install.packages('dwp')

Monthly Downloads

279

Version

1.1

License

CC0

Maintainer

Daniel Dalthorp

Last Published

July 1st, 2023

Functions in dwp (1.1)

Names of the GLM Coefficients for Each Distribution

Convert GLM Coefficients into Named Distribution Parameters

Fit Distance Distribution Model(s)

Check Whether GLM Coefficients Give Proper Distribution

Calculate CI for CDF, PDF, or quantile

Simulation of Dispersion Parameters

Calculate Probability Functions for Distance Distributions

Constraints on GLM Coefficients for Extensibility to a Distribution

constraints_par

Constraints on Parameters to Assure Extensibility

Estimate Probability Carcass lands in Searched Area

Extract Parameters from a Distance Model (dd) and Format as ddSim Object

Full List of Names of Distributions

Print S3 Objects in dwp Package

An Ordering of the Models by Degree of the Polynomial

Density-Weighted Proportion

Export Estimated Density-Weighted Proportion to File in Proper GenEst Format

Remove Particular Names from a Longer List

Example Bare Vector Format for Eagle Data

Create a Data Structure or Map for the Site Layout

Simple Function to Extract Carcass Counts

Utility Function for Constructing Offsets for GLMs

Check Parameter Value Validity the Distribution

Example Polygon Data for Site Layout

Example Data for Site Layout on an (x, y) Grid

Vector of Names of Models with Natural Offset

List of Names of the Distribution Parameters Associated with Respective Models

Names of All the Available Models

Incomplete Gamma Function

Run Models through a Sieve to Filter out Dubious Fits

Convert Distribution Name + Parameters to ddSim Object

Example Simple Geometry Data Format for Site Layout

Default Graphics Parameters

Test Criteria for Model Selection

Test Criteria for Model Selection within Search Area

Vector of Names of Models Available for Grid Layout

Locations of All Carcasses in Grid Data

Format DWP Estimate for Use in GenEst

Find suitable mmax for clipping improper priors for M

Calculate posterior distribution of M and extract statistics (M* and CI)

Vector of GLM Offsets for Available Models

Import Carcass Observations Locations from Shape Files

Format a Search Layout into Rings for Analysis

Vector of Names of Standard Models

subset.shapeCarcass

Subset Data from an Imported and Formatted Shape File

Simple Utility Function Used in Optimizing the GLM

Subset Simulated Dispersion Parameters while Preserving Attributes

Vector of Line Types Used in Graphs of Fitted Models

Vector of Colors Used in Graphs of Fitted Models

Internal Utility Function to Parse and Format Model for Calculating Psihat

Display a Tables of Summary Statistics for Distance Distributions

Simple Extension of a dd Model beyond the Search Radius

Subset a Set of Fitted Dispersion Models (ddArray)

carcass_simple0

Full, Simulated carcass_simple Data Set (Including Locations and Missed Carcasses)

Check validity of format of custom prior for M

Calculate Akaike Information Criterion (AICc) for Distance Distributions

Plot dd and ddArray Objects

Calculate Area of Intersection inside Circle and Square with Common Center

Probability Distributions for Carcasses Versus Distance from Turbine

Add Carcasses to a Site Layout

carcass_polygon

Example Carcass Distances to Accompany the Polygon Layout Data Set

Names of the Named Distributions

Carcass Data to Accompany the Simple Geometry Data Format