Attribute: DBH_CODE

code  description    
1    DBH estimated by linear interpolation or extrapolation     
2    DBH estimated from growth rates of nearby trees of similar size     
3    DBH estimated assuming 'no growth' (usually missing, non-vigorous, or damaged trees)     
4    DBH estimated for individual boles using basal area of joint dbh of grown together (fused) trees     
8    DBH is measured using a non-standard field procedure or estimated in the field     
9    DBH estimated, method unknown or unspecified     
G    Good: normally measured DBH     
M    Missing: no measurement taken for missing or dead (mortality) trees     
U    Unknown: DBH is missing for a tree not listed as missing or dead     
V    Verified: diameter is double checked in the field