iHypsometer is the softwawre to measure the tree height with iPhone/iPod touch (You can also measure the height of a telegraph pole, a tower, a building, etc.).
All you need to measure the tree height is a iPhone/iPod touch that installed iHypsometer, and a friend (or the stick) whose height you know.
If you have any questions and requests, please send E-mail to this address.
Email Address: iHypsometer"replace here to at mark"taakkumn.com
(Replace "replace here to at mark" to @.)
And check this Web site.