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Calculate tree basal area from DBH

By Martin Cerny / Oct 6, 2016

OnChange script on Trees.DBH_mm calculates tree basal area. Whenever the value of DBH_mm is changed the value of BasalArea_m2 is automatically calculated.

begin
  if Trees[‘DBH_mm’] = NULL then   
    Trees[‘BasalArea_m2’] := NULL
  else   
    Trees[‘BasalArea_m2’] := Round(Pi * Power(Trees[‘DBH_mm’]/2000,2),3);
end.

Download scripting example 001 (Field-Map Project)

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