Cosine method

General discussions of measurement techniques and the results of testing of techniques and equipment.

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Will Blozan
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Re: Cosine method

Post by Will Blozan » Thu Oct 03, 2013 5:13 pm

Bob,

Looks good- need some typo work though.

Will

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Don
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Re: Cosine method

Post by Don » Thu Oct 03, 2013 6:34 pm

Bob-
Hey, ain't it great to have those with young eyes around?! We're gonna end up with some refined products, looks good!
-Don
Don Bertolette - President/Moderator, WNTS BBS
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View my Alaska Big Tree List Webpage at:
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dbhguru
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Re: Cosine method

Post by dbhguru » Thu Oct 03, 2013 8:35 pm

Don,

Indeed. And I just got new glasses. But I fear what I really need is a new brain.

Bob
Robert T. Leverett
Co-founder, Native Native Tree Society
Co-founder and President
Friends of Mohawk Trail State Forest
Co-founder, National Cadre

morgan
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Re: Cosine method

Post by morgan » Sun Oct 13, 2013 9:10 am

In case you don't want to sit down with a pencil and paper and do the whole triangle thing, I just came up with a mnemonic for the cosine method in case all you have is a rangefinder and your cell phone has a scientific calculator setting. You measure the hypotenuse to the top and the adjacent to the trunk.

Here are the keystrokes on the calculator:

Adjacent Divide Hypotenuse Equals Inverse Cos Tan Times Adjacent Equals

ADHEICTTAE
Last edited by morgan on Tue Nov 05, 2013 3:02 pm, edited 1 time in total.

morgan
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Joined: Tue Sep 17, 2013 9:34 am

Re: Cosine method

Post by morgan » Sun Oct 13, 2013 9:30 am

I just measured my pine 28.5 adjacent and 38.5 to the top

ad heict tae

28.5 / 38.5 = inv cos tan x 28.5 =
Last edited by morgan on Tue Nov 05, 2013 3:03 pm, edited 1 time in total.

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dbhguru
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Re: Cosine method

Post by dbhguru » Sun Oct 13, 2013 7:21 pm

Morgan

I had intended to apply the "clinometerless" technique to some trees here in Atlanta during the TCI-NTS rendezvous, but didn't get to do it. It was a very busy, but productive gathering. I'll do some independent testing of the method when I return to Mass.

Bob
Robert T. Leverett
Co-founder, Native Native Tree Society
Co-founder and President
Friends of Mohawk Trail State Forest
Co-founder, National Cadre

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