Correction Factors for Tree Plot Areas Intersected by Stand Boundaries

The German national forest inventory uses angle count sampling, a sampling method first published as `Bitterlich, W.: Die Winkelzählmessung. Allgemeine Forst- und Holzwirtschaftliche Zeitung, 58. Jahrg., Folge 11/12 vom Juni 1947` and extended by Grosenbaugh (< https://academic.oup.com/jof/article-abstract/50/1/32/4684174>) as probability proportional to size sampling. When plots are located near stand boundaries, their sizes and hence their probabilities need to be corrected.

treePlotArea

Introduction

Please read the vignette.

Or, after installation, the help page:

help("treePlotArea-package", package = "treePlotArea")

#> Correction Factors for Tree Plot Areas Intersected by Stand Boundaries
#> 
#> Description:
#> 
#>      The German national forest inventory uses angle count sampling, a
#>      sampling method first published by Bitterlich (1947) and extended
#>      by Grosenbaugh (1952) as probability proportional to size
#>      sampling. When plots are located near stand boundaries, their
#>      sizes and hence their probabilities need to be corrected.
#> 
#> Details:
#> 
#>      You will find the details in
#>      'vignette("An_Introduction_to_treePlotArea", package =
#>      "treePlotArea")'.
#> 
#> References:
#> 
#>      Bitterlich, W. (1947): Die Winkelzählmessung. Allgemeine Forst-
#>      und Holzwirtschaftliche Zeitung, 58.
#> 
#>      Grosenbaugh, L. R. (1952): Plotless Timber Estimates - New, Fast,
#>      Easy. Journal of Forestry.
#>      https://academic.oup.com/jof/article-abstract/50/1/32/4684174.

Installation

You can install treePlotArea from gitlab via:

if (! require("remotes")) install.packages("remotes")
remotes::install_gitlab("fvafrcu/treePlotArea")