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. 2015 Sep 22;10(9):e0137765. doi: 10.1371/journal.pone.0137765

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This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration, which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose.

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Fig 5 — a. circular, at constant height; b. ‘stacked circles’, each at different above-ground height, for tall trees (height more than 20 m); c. spiral, for trees with complex geometry; d. vertical meandering, targeting tree sectors; e. clover, for trees with wide, ellipsoidal tree crowns; f. ‘spring-hemisphere’, designed for trees with flat-top, asymmetrical crowns; g. ‘nested circles’, centered on the tree; and h. ‘jagged saucer’, designed for trees with dense foliage but low crown compaction ratio.