JUDGING TREE HEIGHT WITH GEOMETRYModerator: Team Cub
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JUDGING TREE HEIGHT WITH GEOMETRYYEARS AGO I READ METHOD OF DETERMINING HEIGHT OF TREE. SEEMS LIKE YOU STOOD AT BASE OF TRUNK, MEASURED UP , LIKE SIX FT. MAYBE THEN BACKED OFF WITH MEASURING STICK UNTIL LENGTH OF STICK EQUALED .... SOMETHING... BUT THERE MY MEMORY FAILS.. HEY, IT WAS 65 YRS. AGO SO DON'T LAUGH! I KNOW BIG DOG, GEO. WILLER, RUDY, AND COUPLE OTHERS CAN DESCRIBE IT SO EVEN I CAN UNDERSTAND. THANKS,
Hart,
Come on over and we'll practice on some of my trees. Basically you have to know the distance of a reference point and the angle at that point between the line of sight to the base of the tree and the line of sight to the top of the tree. From that information many of us can calculate the height. There are several methods. Most of them assume fairly level terrain. A stick could be set up at an intermediate point at a known distance to set up a proportionate triangle. My memory is fresh... it's only been maybe 60 years since whenever we did that in math class. I no longer have a transit to make it easy. George Willer
http://gwill.net The most affectionate creature in the world is a wet dog. Ambrose Bierce
Hart:
I am not great on theorems.. but.. my favourite one is Pythagorean Theory. This is one I have always used in laying out squares.. and a 25 pack of Cdn smokes was perfect to remind me of the theory. A squared plus B squared = C squared or in the case of smokes 3x3 plus 4x4 = 5x5 or 25 You can measure the height of a tree the same way. I Googled  "Triangulation to determine tree height" . and found this Measuring Tree Heights Hope this helps. Confusion breeds Discussion which breeds Knowledge which breeds Confidence which breeds Friendship
Take a stick, make a mark on the trunk of the tree at the end of the stick. Cut the tree off with a chainsaw and it will be exactly the same height as the stick................
Bigdog
If you can't fix it with a hammer, you've got an electrical problem. My wife says I don't listen to her.         Or something like that! http://www.cubtug.com
Hart,
I think what you are describing is the Biltmore Stick. Check this link. http://www.treetech.com/reports/biltmore_stick.xhtml Don McCombs
MD, Deep Creek Lake "1950 Something" Farmall Cub 1977 International Cub w/FH 1978 International Cub 1948 Farmall Super A 1951 Farmall Super C w/FH
Rudi, Can I borrow your clinometer for the weekend? In Boy Scouts, we would have a Scout of known height (5" was pretty common back then)stand in front of the tree. You'd then hold a stick at arms length vertically with the top end even with the top of the tree and slide your finger until it was even with the base. You'd then take a finger from the other hand, mark the top of the scout, slide the stick down, mark the top of the head again and again until you ran out of stick. Then multiply 5' by the number of slides you did. Not as accurate as these other methods, but no calculator needed.
Bob
If you want to kick it up a notch, you could try making a proportion. you guys correct me if i'm wrong, but theoretically you could drive a stake in the ground, measure it, its shadow and the trees shadow, then figure out the height of the tree, represented below as "x" . set it up just like below, then 'cross multiply' the top left number with the bottom right, then the top right number with the bottom left. you set them equal to each other and then you have a basic algebra problem. i used a few common whole numbers for simplicity's sake. Give it a try if you have nothing better to do!
Andrew Spivey
"What doesn't kill you makes you stronger."  Friedrich Nietzsche '49 Cub.....(Mr. Cub)
The math is killing my small brain. You would need 2 measurements to do the math and if ya had that you would already know the heigth.We took a stick and eyeballed the tree from far enough away that you could get the whole tree length on the stick then flipped it 90 degrees from the base of the tree and found the end of the mark and measured the length on the ground. Know what I mean?? Hope so. It's fairly accurate too. Grump
David Dee MockLeonard
Nothing is foolproof to a sufficiently talented fool. Some days it's not worth chewing through the restraints
Or you can use my polish method. Usually I imagine a 45% angle to the top of th etree and thats usually where it lands. Or if the space is tight. Asuming the ground is flat. Put a speed square on a level get it level and to looking up the 45% side line it up to the top of the tree. Look down it from it to the ground and thats where it will hit. If you mesure from there back to the tree thats how tall it is.
Billy Take care of your equipment and it will take care of you. 1964 cub. Farmall 100 and 130.
"Those that say it can’t be done should not interrupt the ones who are doing it.”
When I stopped lifting weights...that didn't kill me. So, does that mean that not lifting weights only makes me stronger? In my Biology class I teach my students how to do this. We make home made clinometers using a small plastic protractor. If you measure the distance from the tree you are trying to estimate, and then record the angle between the viewer and the top of the tree with the clinometer, you will have all you need to estimate the tree's height. The formula is: [distance from tree] [tangent of the angle] + [height of the person recording the angle] = tree height My other addiction...www.thunderboltskirun.com/militaria
hmm....looks to me to from your math that maybe you had free time to work on mathematics and become mentally stronger?? u got me cornered there .... Andrew Spivey
"What doesn't kill you makes you stronger."  Friedrich Nietzsche '49 Cub.....(Mr. Cub)
You guys make things way to complicated. Have someone of known height stand at the base of the tree ( a 6 footer works great). Stand back a few yards and say, yup , it is about 5 times as high.
"The Constitution is not an instrument for the government
to restrain the people, it is an instrument for the people to restrain the government lest it come to dominate our lives and interests." Patrick Henry
OK, next question, how to do it without the clinometer/protractor? Here is a hint, it will be easier next week.
cut it down, but then you will be measuring ho long it is, not how tall. "The Constitution is not an instrument for the government
to restrain the people, it is an instrument for the people to restrain the government lest it come to dominate our lives and interests." Patrick Henry
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