Sylvan Stand Structure Models

The Sylvan Stand Structure Model applies stand dynamics principles to data that the you collect from a stand you would like to predict. The model requires more from you but in return provides flexibility. The base model is spatially explicit growth model that is driven by crown size and change. While the modeling effort in 1987, it is actively being develop.

This website has a couple of purposes:

  1. to inform others about this modeling effort, the model features and potential uses,
  2. to document the components of the model and how to create parameter and data files,
  3. in the future to distribute the model, and
  4. in the future to allow sharing of parameters and data.

Development News

October, 2013 -- Video of a talk at the Society of American Foresters Sylvan Stand Structure Model.

Currently Sylvan is undergoing several big changes. Many of the changes are dependent of new additions to our development staff. The biggest change is a rework of the data structure. We will update this website once changes are settled.

December, 2011 - August 2012 -- Datalogger First large scale field test of Sylvan-Datalogger ro collect a large number of 1/2 acre repeat measurement plots.

July, 2011 -- Datalogger has been expanded to include remeasurement data and multitasking through the use of interconnected wireless programs on various computer talking to laser lange finding devices.

February, 2010 -- Datalogger has been developed to help electronicly collect data from laser rangefinders, compass and clinometer. This program also maps the data as it is being collected. Also Tree-Image has been developed to allow tree measurement from photographs.

March, 2009 -- Sylvan database structure definitions added ( see Database). This is the start of an extensive set of documentation files to allow users to understand and use the Sylvan data structure.

February, 2009 -- Sylvan function library added ( see Functions). The philosophy of this model is to use best available data. The data can come from any sources, your own data collection, published data, or hypothetical relationships. In an effort to make the use of published data easier, we have collected relevant equations into Extensible Markup Language (XML) files. These files provide user machine readable files with citations and Uniform Resource Locator (URL) links. They also include MathML coding of the functions and the parameters for each species published. We hope you find these files a useful reference.

Creative Commons License
This work is licensed under a Creative Commons Attribution-Noncommercial 3.0 United States License.

Author: Dr. David R. Larsen
Created: March 21, 2007
Last Updated: February 4, 2014