Units of measurement, symbols, significant digits and rounding off
1.1 Units of measurement and symbols
1.2 Significant digits
1.3 Rounding off
1.4 Bias, accuracy and precision
Individual Trees and Logs
2.1 Bole characteristics
2.1.1 Diameter
2.1.2 Height
2.1.3 Bark thickness
2.1.4 Volume
2.1.5 Stem form and taper
2.2 Log characteristics
2.2.1 Diameter
2.2.2 Length
2.2.3 Volume
2.2.4 Weight
2.2.5 Allowance for defect
2.3 Crown characteristics
2.3.1 Width
2.3.2 Depth
2.3.3 Surface area
2.3.4 Volume
2.3.5 Biomass
2.4 Stem analysis
Groups of Trees (Stands)
3.1 Number of trees
3.2 Diameter
3.3 Basal area
3.3.1 Fixed-area plots
3.3.2 Angle count sampling
3.3.3 Advantages and disadvantages of angle count sampling
3.4 Height
3.4.1 Mean height
3.4.2 Predominant height, top height, dominant height
3.4.3 Stand height curve
3.5 Volume
3.6 Crown closure
3.7 Crown biomass
3.8 Growth and increment
References
Appendix 1: Checklist of equipment and materials

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2.1 BOLE CHARACTERISTICS

The characteristics of tree boles most commonly measured by forest workers are diameter, height, bark thickness and volume, and less commonly, form and taper. Recommended field practices relevant to the measurement or estimation of these characteristics are summarised in sequence below.

Common to all of these practices is the need for the recorder of the measure data:

(i) to call back clearly to the measurer the information that is being recorded (this simple procedure eliminates a common source of error in measurement), and

(ii) to develop a competence in ocular estimation particularly of diameter and height. By quick ocular appraisal of a tree, a suspect measurement can often be identified and checked before the information is recorded. 		 

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January, 1999.