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Thanks, Larry. It sounds like a plan, if one can distinguish the top of the
tree from the rest of the canopy and if one can "stride" on the uneven
ground. We are not likely to get back to Abraham Lake, but I sure hope
someone else will do it. Those trees are Biggies.
Jane
-----Original Message-----
From: naturens-owner@chebucto.ns.ca
[mailto:naturens-owner@chebucto.ns.ca]On Behalf Of Larry Bogan
Sent: Monday, October 05, 2009 1:48 PM
To: naturens@chebucto.ns.ca
Subject: Re: [NatureNS] Look at big trees - Measuring
Jane,
I have a feeling that measuring the height of the tree is one of the
deterents in sending in information on a big tree. It is difficult to do
accurately, especially in the woods. I have adopted a standard method
that gives a good estimate of the height.
There are three measurements needed to get the height.
I use a steel tape measure for two of my measurements
1. Hold the tape vertically to measure the viewed height along
the tape measure - with the tip at the top and my thumb holding the tape
and matched with the bottom of the tree.
2. Then without moving my eye or arm, I use my other hand to pull
the tape back and measure the distance from my thumb (tape distance to
the eye) and clamp it so I can then look down and read it.
The third and most inaccurate is the distance to the tree. Pulling a
string or tape measure through the woods in a straight line is usually
impossible and very time consuming. I have taken to using my stride as a
measure. Surprisingly, if a person develops a uniform stride it does
not vary vary much in length. My two steps (stride) is almost exactly 5
ft and so I usually take 20 strides from the tree (if there is room and
I can still see the bottom and top of the big tree) to get approximately
100 ft from the tree.
Of course striding through the woods is not easy or uniform but it
is better than nothing and I do use the method as best as can be in the
woods and have to take fewer than 20, many times, to keep the parts of
the tree in sight.
Then calculate: Height of Tree = [(height along tape)/(tape to eye
distance) ] x distance from the tree (feet or metres)
So all you need to measure the diameter and height of a tree is a tape
measure. I do like to have a picture and a Lat/Long position also (the
later can be taken from a map or Google maps).
Cheers,
Happy Measuring
Larry
> 2. How do you estimate height of trees in the woods? We tried to report
on
> the trees at Abraham Lake a couple of years ago. The ground was so
> hummocky, and the trees so close together, that we were unable to use the
> system that we downloaded from the website.
> Cheers.
> Jane
>
>
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<P><FONT size=3D2 face=3D"Comic Sans MS">Thanks, Larry. It sounds =
like a plan,=20
if one can distinguish the top of the tree from the rest of the canopy =
and if=20
one can "stride" on the uneven ground. We are not likely to get =
back to=20
Abraham Lake, but I sure hope someone else will do it. Those trees =
are=20
<U>Biggies</U>.<BR>Jane<BR><BR>-----Original Message-----<BR>From:=20
naturens-owner@chebucto.ns.ca<BR>[</FONT><A=20
href=3D"mailto:naturens-owner@chebucto.ns.ca"><FONT size=3D2=20
face=3D"Comic Sans =
MS">mailto:naturens-owner@chebucto.ns.ca</FONT></A><FONT size=3D2=20
face=3D"Comic Sans MS">]On Behalf Of Larry Bogan<BR>Sent: Monday, =
October 05, 2009=20
1:48 PM<BR>To: naturens@chebucto.ns.ca<BR>Subject: Re: [NatureNS] Look =
at big=20
trees - Measuring<BR><BR><BR>Jane,<BR> I have a feeling that =
measuring the height of the tree is one of the<BR>deterents in sending =
in=20
information on a big tree. It is difficult to do<BR>accurately, =
especially in=20
the woods. I have adopted a standard method<BR>that gives a good =
estimate=20
of the height.<BR> There are three measurements needed to =
get the=20
height.<BR> I use a steel tape measure for two =
of my=20
measurements<BR> 1. Hold the tape =
vertically=20
to measure the viewed height along<BR>the tape measure - with the tip at =
the top=20
and my thumb holding the tape<BR>and matched with the bottom of the=20
tree.<BR> 2. Then without moving my eye or =
arm, I=20
use my other hand to pull<BR>the tape back and measure the distance from =
my=20
thumb (tape distance to<BR>the eye) and clamp it so I can then look down =
and=20
read it.<BR><BR>The third and most inaccurate is the distance to the =
tree.=20
Pulling a<BR>string or tape measure through the woods in a straight line =
is=20
usually<BR>impossible and very time consuming. I have taken to using my =
stride=20
as a<BR>measure. Surprisingly, if a person develops a uniform =
stride it=20
does<BR>not vary vary much in length. My two steps (stride) is almost =
exactly=20
5<BR>ft and so I usually take 20 strides from the tree (if there is room =
and<BR>I can still see the bottom and top of the big tree) to get=20
approximately<BR>100 ft from the tree.<BR> Of course =
striding=20
through the woods is not easy or uniform but it<BR>is better than =
nothing and I=20
do use the method as best as can be in the<BR>woods and have to take =
fewer than=20
20, many times, to keep the parts of<BR>the tree in=20
sight.<BR><BR> Then calculate: Height of Tree =
=3D [(height=20
along tape)/(tape to eye<BR>distance) ] x distance from the tree (feet =
or=20
metres)<BR><BR> So all you need to measure the diameter and height =
of a=20
tree is a tape<BR>measure. I do like to have a picture and a Lat/Long =
position=20
also (the<BR>later can be taken from a map or Google=20
maps).<BR><BR>Cheers,<BR>Happy Measuring<BR><BR>Larry<BR><BR>> =
2. How=20
do you estimate height of trees in the woods? We tried to report=20
on<BR>> the trees at Abraham Lake a couple of years ago. The =
ground was=20
so<BR>> hummocky, and the trees so close together, that we were =
unable to use=20
the<BR>> system that we downloaded from the website.<BR>> =
Cheers.<BR>>=20
Jane<BR>><BR>> <BR></FONT></P></BODY></HTML>
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