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Project: Tree List Generation Database

The tree list generation database was developed for the Stand Management Cooperative (SMC) at the University of Washington. The tree list generation database was designed to generate simulated tree lists for Douglas-fir (Pseudotsuga menziesii) stands, western hemlock (Tsuga heterophylla) stands, and stands that are mixtures of these two species. Three stand types are supported by the tree list generation database for these two species: stands having at least 80% of their basal area represented by one of these two species will be referred to as pure stands for that species, stands having at least 50% of their basal area represented by one of these two species will be referred to as dominant stands for that species, and stand having less than 50% in either or both of these species will be referred to as mixed stands.

The tree list generation database uses actual tree measurements from forest stands spanning the Pacific Northwest from southern Oregon to southern British Columbia, west of the Cascade Mountains. The tree list generation process is broken down into two parts: a stand classification procedure based on a multidimensional histogram and a stand generation procedure based on a nearest neighbor criterion for selecting the trees used to generate a simulated stand.

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