a type of forest sampling in which the sample is selected with a probability proportional to tree size —note 1. the variable plot size is proportional to the size of the tree being sampled —note 2. an angle device (prism) is used to project a constant angle, and all trees wider than that angle are tallied —synonym angle-count method, angle-gauge sampling, Bitterlich sampling, prism-count sampling, horizontal point sampling, plotless sampling, point cruising, prism cruising, variable plot cruising, variable-radius plot sampling —see angle-count method, forest inventory, relaskop, sampleThis definition last updated 07/30/2008