FRST 112 - Forest Inventory (Doug's Part)

Terms & Concepts

Log Scaling & Grading

Terms

• foot board measure (FBM), cunit, dm3, rads, accountant's rounding

• kerf, trim allowance, AUV (ave. unit volume), OLK (occ. larger knot), ring count

• piece scaling, weight scaling, log grade vs. "sort"

• butt swell, check, shake, clear, collar, dryland sort, gross scale (=gross volume), net scale (=net volume = firmwood volume)

• L (lumber), ML (merchantable lumber), M (merchantable), V (veneer), SS (shake & shingle), pulp, firmwood reject

Questions

• Why do we scale (uses of data)

• List the 2 digit species codes for scaling

• Outline each scaling era: (1895) Boardfoot Scale vs (1944) Lumber Cubic Scale vs. (1965) Firmwood Cubic Scale

• Provide an overview of weight scaling

• Determine the volume of a log using the scale stick (i.e. half-volume tables)

  • gross volume

  • net volume (deduct for rot)

  • lumber volume (add trim allowance)

• Be able to determine the net log measurements for butt rot, heart rot, conk rot and missing wood

• List and describe the statutory log grades

• Using the grade cheat sheet, determine the grade of a log

Statistics

Terms

• mean, standard deviation, coefficient of variation, standard error, sampling error, confidence level, confidence interval, t-value, degrees of freedom (= # plots - 1) final answer, true answer, distributions (uniform, skewed, uni- bi-modal, normal), bias, accuracy, precision, stratification/ strata, random sampling, systematic sampling

Questions

• draw and explain the magic table

• given a data set, calculate: std deviation (SD), coefficient of variation (CV), std error in units & percent and sampling error at 95% confidence in units and percent