Terms & Concepts for Forest Measurements III

What follows is a guide for what you are responsible to know.  Actual questions on quizzes & tests will vary - additional terms and questions are possible (likely).  Check back often for updates (indicated in red font).

 

Scaling Glossary

Cruising Glossary

 

Introduction to Log Scaling

Terms

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foot board measure (FBM), cunit, dm3

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piece scaling, weight scaling, foreign material

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butt swell, callipering, check, shake, clear, collar, dryland sort, gross scale, merchantable lumber, peeler block, "rads", accountant' rounding, slab

 

Questions

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Briefly compare Doyle, Scribner and 'Decimal C' log rules

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Briefly compare log rules vs. Lumber Cubic Scale vs. Firmwood Cubic Scale

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Provide an overview of weight scaling

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Briefly describe the layout (what do the numbers mean) and use of the BC Metric Scale stick (determine gross and net measures)

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Provide an outline of log scaling history in BC (i.e. provide significant dates and methods)

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Determine the gross volume of a log using Smalian's formula and the scale stick (or half-volume tables)

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Differentiate between common species of logs found on a dryland sort on the coast of BC and provide the accepted two-digit code

 

 

Firmwood Calculations

Terms

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net firmwood volume, decay (incipient, intermediate, advanced), butt rot, heart rot, sap rot, conk knot, ring rot, pocket rot, punky

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cat face, dead side, missing wood, (sound wood) collar, end checking, fractures

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unit volume, average unit volume (running volume, 1 metre volume), end deduction, length deduction

 

Questions

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Calculate net measures (end, length and volumes) of logs with defect

 

 

Log Grading

Terms

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trim allowance, bark seam, fracture, clear, twist (spiral grain), ring count, displaced centre

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knots, knot indicators, occasional larger knots (OLK), 'otherwise grade', pistol grip/ sweep, peeler block, quality considerations, worm holes, toredos

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schedule of coast timber (log) grades, shop grades, sorts, side

 

Questions

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Provide the schedule of log grades in tabular form for common coastal tree species

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Describe and be able to apply the correct procedures for determining:
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twist

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ring count

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displaced centre

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grade reduction - a.k.a. apply trim allowance for various defects (i.e. volume not available for lumber)

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Using the "cheat sheet", apply the correct procedures for determining log grades according to the schedule of coast timber (log) grades

 

 

Practical Sampling & Statistics

Terms

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standard deviation (SD), coefficient of variation (CV), standard error (SE), sampling error (E), confidence level, confidence interval

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accuracy, precision, bias, random sampling, systematic sampling, stratification

 

Questions

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For any given sample set, determine E (% or units) at any confidence level

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Stratify a sample set and determine the combined E (% or units) at any confidence level

 

 

Call Grade & Net Factor

Terms

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Questions