Ag Science

3. distance from groundline to the highest point of the main stem.
5. accomplished using a glass prism or angle gauge instruments
8. located across a tract in a systematic manner or grid pattern
9. mathematical log rule that uses a simple formula to estimate board foot volume in a log
11. a unit of horizontal measure that is common to forestry.
13. good measure of volume for individual trees and can be summed across a number of trees.
18. yield height measurements directly in feet or meters
19. considered circles
20. an instrument used to extract a small cylindrical core of wood from a tree.
21. method for capturing, storing, updating, manipulating, evaluating, analyzing, reporting, and displaying forms of geographically or spatially referenced information
22. instrument based on similar triangles that measure the number of logs in a tree.
23. used directly and indirectly in forest inventory.
24. board or plank that nominally measures 1 inch thick by 1 foot wide by 1 foot long.
25. a diagram log rule because the amount of board foot volume is derived from diagramming.

1. total tree height minus bole height, or the length of the live crown.
2. the distance from the top of the stump to the terminal position
4. the most popular instrument for measuring DBH
6. common sample unit used by foresters in timber inventory.
7. simple, but subjective, classification of the position of a tree’s crown in relation to other trees in the stand.
10. distance from the groundline to the terminal position
12. distance from the groundline to the typical point
14. a measure of actual or potential forest productivity that is used as an indicator
15. important forestry measurement derived from tree diameter
16. provides information with which important decisions are made about forest resource management.
17. distance from the groundline to the base of the live crown