UKTC Archive

Re: Diameter callipers

Subject: Re: Diameter callipers
From: Bill Anderson
Date: Aug 14 2019 12:47:06
They are more than likely simply for development site purposes Wayne, for
working out what we'd call the Root Protection Area (RPA). In which case,
there simply isn't much need for an estimate. FWIW, a colleague and I when
undertaking such work would guess at the diameter and then confirm it with
a diameter tape. The estimate was usually "near enough." As Simon says you
don't need to be that accurate. So, to Graham, once you've "got your eye
in" you'll be OK.
Bill.

On Wed, 14 Aug 2019 at 12:50, Wayne Tyson <wt750mv@xxxxxx.com> wrote:

May I ask for what specific purposes the measurements are being made?

Wayne

On Wed, Aug 14, 2019 at 1:34 AM elsteadbysea@xxxxxxxxxxx.com <
uktc@xxxxxx.tree-care.info> wrote:

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



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The UKTC is supported by Bosky Trees arboricultural consultancy
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