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Re: laser rangefinders

Subject: Re: laser rangefinders
From: Jim
Date: Dec 20 2007 16:45:20 
Hi
I have been using a truepulse for the past 2 years - fantastic time saver if
you do allot of survey work I wouldn't be without one.
It is not suitable for measuring DBH for 5837 as it just takes a side view
of the stem and trees are not round - for forestry work estimating yields
etc where loads of trees are measured but individuals are not important it
may be sufficiently accurate.
Lasers do suffer during heavy rain fog or snow - the laser bounces off the
water rather than the object you are aiming it at so readings can fail -
this is obvious with really bad conditions but sometimes is not so obvious
if conditions are intermediate.
Latest models can also of set distances against internal compass for GPS
plotting and have a two shot sequence to measure the distance between a
branch and a powerline/building etc using simple height distance
triangulation
Also good for measuring third party trees from a distance/ over the garden
fence. 

Cheers

Jim Richardson
Woodsman Arboricultural Consultancy
Newcastle

0777 399 1474
----- Original Message -----
From: "Graham Joyce" <grahamjoyce@xxxxxxxx.net> 
To: "UK Tree Care" <uktc@xxxxxx.tree-care.info>
Sent: Thursday, December 20, 2007 9:07 AM
Subject: laser rangefinders


Morning all

Does anyone have any advice over what to look for when buying one of these?
Can they measure dbh and crown spread to sufficient accuracy for 5837 for
instance? 

Thanks

Graham Joyce
B Sc (Hons), Dip Arb (RFS), M Arbor A, Tech Cert Arbor A
Manager

Dartmoor Tree Surgeons Ltd
10, Parkway
Woodbury
Exeter
Devon
EX5 1NG

Tel: 01395 232854    Mobile: 07970 846205


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