Principal Components of Forest Inventory

“What is really required, but only marginally understood.”

April 25-27, 2016
Great Wolf Lodge, Grand Mound, WA
Instructors: Jim Arney and Brock Purvis, Forest Biometrics Research Institute

Determining forest growth capacity, harvest capacity and making investment decisions are all reduced to guesswork without a strong, well-maintained and dynamic forest inventory.  The essential components, methods and tools are provided in this upcoming FBRI training.

This was an all-new training curriculum featuring a day in the field conducting actual sample techniques and 1.5 days indoors.  Participants took  home the current FPS Guidebook for conducting an “Inventory Cruise” as opposed to a “Harvest Cruise”.

Regardless of the management objective of the forestland owner, the quality (accuracy and timeliness) of the forest inventory is essential to all investment decision-making.  This includes staffing, silviculture, harvest methods and expected cash flows.


Workshop Agenda:

April 25: 1 — 5 PM Indoor Session
Designing Your Cruise with the full range of FPS functionality

April 26: 8 AM – 4 PM Field Session (Lunch provided)
Conducting Your Cruise using FPS alternative techniques

  • Attendees were divided into teams to cruise nearby stands.
  • Discover impacts of alternatively sub-sampled height distributions.
  • Evaluate alternative sub-sampling designs of defect estimation and broken tops.
  • Exploring the threshold (minimum Dbh) for BAF versus fixed-area plots.
  • Documenting the variance among plots and its impact on clumpiness.

Cruise data was used on April 27 to display FPS results from field alternatives.

April 27: 8 AM – 3 PM Indoor Session (Lunch provided)
Managing Your Cruise Data using FPS Compilations, Expansions and Growth

  • Cruise data from 4/26 were used to build a complete year-end inventory.
  • What are the effects of sub-samples for height, defect, grade, age, taper and damage?
  • FBRI Inventory Basics Part-3 (download)
  • When, why and how to expand cruised-stand samples to un-sampled stands.
  • How to inventory and manage riparian and wildlife buffers in a working forest.
  • Where do the plots and data go after a stand is split due to harvesting?
  • How to update and report annual harvest depletions, growth and land exchanges.


Training Location
The session will be held at the Great Wolf Lodge in Grand Mound, WA on I-5 at Exit 88. The lodge is located at 20500 Old Highway 99, SW, Grand Mound, WA.

Lodging Information
Reduced rate lodging was set aside at the Great Wolf Lodge. Reservations were made by calling 800-640-9653 or online at: The rate was $139 plus tax.

The FBRI member registration fee was $325. The non-member rate was $450. The registration fee included a book of speaker materials, 2 lunches, FPS Guidebook and refreshments.

Society of American Foresters CFE Credits
CFE credits have been applied for through the Society of American Foresters.