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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.

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