**Measuring tree height from a photo is accomplished by having
a photo of the tree with an object in the image of known measurement to provide
scale. Then measuring the image of the tree and the image of the scale object
in the photo and computing the height as follows. **

**Note the following from the photo using a ruler (a
ruler in inches and tenths simplifies calculations):**

**measurement of the scale object on photo with the ruler
= S
measurement of the tree on photo with the ruler = T
**

**Compute the height as follows:**

**T ÷ S
x Sm (measurement) = estimated tree height**

**In the illustration the actual measurement of the scale
is 4 feet**

**T = 5.57
S = 0.55
Sm = 4 feet**

**5.57 ÷ 0.55
x 4 = 40.5 feet**

**Measuring the spread of the crown can be accomplished with
the same method by substituting Sp (spread) for
T in the above formula.**