AS 4970-2009 CALCULATOR
Calculate protection zones & encroachment.
The AS 4970-2009 Calculator is a free web app based on the Australian Standard® AS 4970-2009 Protection of trees on development sites.
Key Features
Accepts circumference or diameter measurements
Calculates diameter at breast height (DBH) and diameter above buttress (DAB) for single and multi-stemmed trees
Calculates tree protection zones (TPZ) and structural root zones (SRZ)
Calculates two types of encroachment
Smartphone optimised
Easy to use in the field
Free to use