DIRGRAM
GLΦ:The diameter of the tree-trunk on the ground.
Φ:The diameter of the tree-trunk in 100cm heigh
H:The height of the sapling
TH:The height of the tree-trunk
W:The width of the sapling
Φ:The diameter of the tree-trunk in 100cm heigh
H:The height of the sapling
TH:The height of the tree-trunk
W:The width of the sapling
![](/images/dirgram01.jpg)
![](/images/dirgram02.jpg)
![](/images/dirgram03.jpg)
![](/images/dirgram04.jpg)