Attribute: TREE_VIGOR

code  description    
1    Good vigor: no apparent signs of distress     
2    Fair vigor: some signs of distress apparent (e.g., discolored foliage, paucity of leaves or needles, broken stem with few live branches)     
3    Poor vigor: extreme distress apparent (i.e., death imminent)     
M    Vigor is not recorded for dead or missing trees     
U    Unknown vigor of a living tree - vigor is not recorded