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Symmetry <br />This condition factor address symmetry of the crown; each tree is assessed in comparison to a perfectly <br />symmetrical crown (Figure 6). Up to 1 point can be deducted if a portion, or portions, of the crown is <br />missing. <br />• 50% crown missing: -1.0 <br />• 25% crown missing: -0.5 <br />• Less than 25% crown missing: -0.25 <br />Figure 6 - Symmetry <br />(Source: https://www.tottenhamtrees.org/uploads/5/6/9/4156947305/1360982_6_orig.jpg) <br />Live crown ratio (LCR) <br />The live crown ratio is the total potential crown of a tree. It is the ratio of the height of the crown to the <br />total height of the tree (Figure 7 and 8). The crown begins where the first main branch on the tree is <br />located and rises to the top of the tree. Note: The crown does not begin at the foliage but at the first main <br />branch. <br />Measuring LCR <br />• Stand far from the tree and hold a tape measure out in front of you. <br />• Take the first measurement by lining up the top of the tree with the beginning of the measuring <br />tape (at the 0) and measure the distance to the base of the tree. Record the number (N) at the tape <br />where the base of the tree is located. This is the total height of the tree you will use to determine <br />the LCR. <br />• Take the second measurement by lining up the top of the tree with the beginning of the measuring <br />tape (at the 0) and measure the distance to the first main branch on the tree (n). <br />• Using the two measurements you've recorded, use the formula n/N to produce the percentage of <br />LCR; divide the second measurement by the first measurement to get the live crown percentage. <br />16 <br />