Check out www.onsitetools.com/measuring/laser/surveying and the Laser
Ace200
A very nice piece of kit with optional inbuilt compass telling you the
pointing direction and with GPS, combined to pin-point position.
According to angle and distance it can calculate crown height, spread,
dbh and location.
They are expensive if you only get to use them on occasion.
Ian
http://www.arun.gov.uk
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