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.
Maintainer: Andreas Dominik Cullmann fvafrcu@mailbox.org
Other contributors:
Bernhard Bösch [contributor]
Christoph Fischer [contributor]
Gerald Kändler [contributor]
You will find the details in
vignette("An_Introduction_to_treePlotArea", package =
"treePlotArea").
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.
Useful links: