Libraries and Databases

Regional Species Libraries are localized, species-specific parameter libraries for cruise compilers, growth models and harvest schedulers. This structure is defined for the Forest Projection and Planning System (FPS) structure and format in the textbook, “Biometric Methods for Forest Inventory, Forest Growth and Forest Planning”, The Foresters Guidebook by Dr. James D. Arney, March 5, 2014, 329 pages. See the geographic ranges on the PDF map of the Western Regions.  FPS 2015 Regional Library

The Forest Biometrics Research Institute offers two kinds of libraries. The “First Approximation” Libraries were built from public or cooperative third-party analyses or reports. The FBRI offers these libraries as first approximation defaults to anyone using the FPS software package and database.

The second kind of Library provides locally calibrated species-specific “FBRI Certified Libraries” developed and maintained from direct field research trials and felled-tree datasets. These libraries are continuously updated and maintained. They contain more precise parameters developed using larger data sets included data maintained and provided by institute cooperating organizations.

Each regional library is based on an in-depth biometrics analysis of taper, volume, site, growth and mortality of all species represented in a large integrated set of permanent plots gathered throughout that region. Each regional library is based on 500 – 9000 permanent plots with 20 to 50 years of re-measurements across a broad array of silvicultural treatments. Each analysis consumed approximately one-year for database loading, editing, analysis and library development when initially developed.

Regional FPS Species Libraries are compiled and analyzed using non-parametric statistical methods.  This provides the most robust analysis of the underlying trends in site, taper and growth dynamics.  Traditional parametric statistical methods were sufficient in the 1970 – 2000 period of forestry research when silviculture primarily focused on even-aged, clearcut regimes.  The demands on silvicultural yield projections have become much more focused on mixed-species, mixed-structure stands.  For this reason, non-parametric models are used exclusively in building FPS Regional Libraries. Non-Parametric Methods

Regional FPS Species Libraries are reviewed by the Forest Biometrics Research Institute annually for accuracy and completeness. Each library is reviewed against permanent field installations of growth and yield every 5-8 years to validate parameters and to calibrate additional or refined biometric relationships. Results of these annual analyses are distributed to all FBRI participating organizations on a regular basis.

A significant number of FBRI organizations have begun to evolve into localized FPS libraries for specific tree farms, forests and reservations where climate, soils and silviculture warrant the refinements. These localized libraries are certified by the FBRI when requested by the local organization and underlying data sets are provided.

These libraries with complete documentation on databases and analyses are available at no charge to all participating organizations in the Forest Biometrics Research Institute.