Table 2.
Coefficients of determination, i.e., the 
values, when calibrating the trunk model for different species and locations. The last column indicates from where the data are collected.
| Species | Locations | Trunk areas | Sapwood areas | Heartwood areas | References | |
|---|---|---|---|---|---|---|
| Pipe model | Trunk model | Trunk model |
Trunk model |
|||
| Douglas-fir (P. menziesii) |
Cascades of Oregon, USA |
0.93 | 0.99 | 0.97 | 0.95 | Gartner (2002) |
| Blue gum (E. globulus Labill.) in Central Portugal |
Azambuja | 0.91 | 0.99 | 0.93 | 0.89 | Morais and Pereira (2007) |
| V. F. Xira | 0.75 | 0.99 | 0.95 | 0.99 | ||
| Crato | 0.65 | 0.98 | 0.84 | 0.97 | ||
| Serta | 0.61 | 0.99 | 0.87 | 0.99 | ||
| Forest red gum (E. tereticornis Sm.) | Ludhiana, India | 0.93 | 0.96 | 0.93 | 0.97 | Kumar and Dhillon (2014) |
| Maritime pine (P. pinaster Ait.) | Portugal | 0.95 | 0.98 | 0.96 | 0.88 | Pinto et al. (2004) |
| Longleaf pine (P. palustris) | Eastern Texas | 0.96 | 0.99 | 0.99 | 0.99 | Conner et al. (1994) |