UKTC Archive

RE: Diameter callipers

Subject: RE: Diameter callipers
From: elsteadbysea@xxxxxxxxxxx.com
Date: Aug 14 2019 08:34:44
Good advice Jonathan.
In defence of gadgets my Truepulse has ben one of my best buys, height, crown 
spread and distance. 

I have had only one report criticised in the past by TO where I had to 
estimate diameters on an adjoining property.

Phillip

-----Original Message-----
From: uktc-request@xxxxxx.tree-care.info <uktc-request@xxxxxx.tree-care.info> 
On Behalf Of Jonathan Astill
Sent: 14 August 2019 09:22
To: UK Tree Care <uktc@xxxxxx.tree-care.info>
Subject: Re: Diameter callipers

Where accuracy is not essential I have a ruler painted on the long edge of my 
A3 weather-writer (43cm) with tippex. 0 cm held up against tangent of left 
side of tree at desired height, note fissure / ivy stem /slug / woodlouse at 
40cm / 80cm etc. and reposition weather-writer to tangent of opposite side. 
Repeat exercise at 90 degree bearing for asymmetrical, lumpy and oval stems 
and take mean average of two readings. When double checked with tape it’s 
about 95% accurate for trees under 1 metre diameter. Just make sure that your 
survey key / methodology states that the diameter is approximate. Takes 
seconds when you’re used to it. Simple, cheap, quick and more than adequate 
for the task at hand.



Use tapes or callipers for 5837, veteran, ancient or champion trees as 
someone will be quick to point out your error.



On the subject of rapid and cost-effective tree measurements, I bought a 
digital measure last year (£30) for measuring canopy spreads and distances of 
trees from other structures (adding half the stem diameter). Accurate to 10mm 
over 40m (checked). The red laser point can be difficult to see beyond
15 meters in bright light but usually fine under shade of tree crown or 
typical British weather. Always keep ground tapes / loggers tape in the car 
to fall back on when needed. Still using a Suunto for tree height (where 
needed). I love a gadget as much as the next person but cant justify the 
colossal expense for the Haglofs and others.



Jonathan



---
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus



--
The UK Tree Care mailing list
To unsubscribe send mailto:uktc-unsubscribe@xxxxxx.tree-care.info

The UKTC is supported by Bosky Trees arboricultural consultancy 
http://www.boskytrees.co.uk/




-- 
The UK Tree Care mailing list
To unsubscribe send mailto:uktc-unsubscribe@xxxxxx.tree-care.info

The UKTC is supported by Bosky Trees arboricultural consultancy
http://www.boskytrees.co.uk/