| Variable | Method | Equipment |
| Clean stem height | Angle measurement | Clinometer |
| Stump diameter | Direct measurement | Diameter tape |
| Normal diameter | Direct measurement | Diameter tape |
| Total height | Direct measurement | Stadal |
| Crown height | Angle measurement | Clinometer |
| Crown area | Area equation | Linear tape |
| Crown volume | Volume equation | Linear tape/clinometer |
| Crown radius | Direct measurement | Linear tape |