What does dbh mean?

[alderman]

I missed this some where in my education here so could somebody clue me in on what dbh means?

 

[John Ellison]

Diameter at breast height

 

[SawTroll]

Diameter at breast height

True, I believe it is defined as 4.5 feet, but not quite sure......:biggrinbounce2:

 

[blis]

True, I believe it is defined as 4.5 feet, but not quite sure......:biggrinbounce2:

AFAIK its breast height, atleast thats how i measure...

 

[rb_in_va]

True, I believe it is defined as 4.5 feet, but not quite sure......:biggrinbounce2:

Depends how high your breasts are.

 

[SawTroll]

Depends how high your breasts are.

Nope, it is a set height, regardless of SawWitchs boobs.......:greenchainsaw:

 

[blis]

Nope, it is a set height, regardless of SawWitchs boobs.......:greenchainsaw:

Didnt expect that comment

 

[smokechase II]

4.5

In the US, it is 4 1/2 feet from the ground level on the uphill side of the tree.

If you are on slope, measure the 4.5 feet up from the ground on the uphill side.

Of course, take a circumference at that height and divide by pi (3.14),
to get dbh.

Not sure about elsewhere. There may be a metric equivalent.

The reason dbh is used;
1) Convenient to work with,
2) It is generally above the butt swell on many trees.

Measuring at the base would be misleading on almost all species.

 

[motosierra]

"D.B.H. (Diameter Breast Height)"

Forestry
http://forestry.about.com/cs/glossary/g/dbh.htm
"D.B.H. (Diameter Breast Height)"
From Steve Nix,
Your Guide to Forestry.

 

[motosierra]

It is an appromate measurement of the trunk of a tree taken when a man is standing....shoulder height

 

[SawTroll]

In the US, it is 4 1/2 feet from the ground level on the uphill side of the tree.

If you are on slope, measure the 4.5 feet up from the ground on the uphill side.

Of course, take a circumference at that height and divide by pi (3.14),
to get dbh.

Not sure about elsewhere. There may be a metric equivalent.

The reason dbh is used;
1) Convenient to work with,
2) It is generally above the butt swell on many trees.

Measuring at the base would be misleading on almost all species.

I believe that concludes this tread nicely, but the Wiches boobs are quite a lot larger than suggested in the avatar.....

 

[STIHL-KID]

How can you estimate how tall a tree is?..........

I was wondering how a person can measure the height of a tree without using any "wiz-bang" gagets or climbing the tree like a squirrel:greenchainsaw: Couldn't a guy measure out the shadow the tree makes on the ground? (only during cloudless sunny days) :help: That is a prefect scenerio of coarse! I think this was a question on my college math test a long time ago? Ok, I'm going to wait for someone to chim-in some expert advice.

 

[smokechase II]

dbh

Actually, it is customary to conclude all dbh discussions with a; What do you think Anna Nicole’s' dbh is? series of jokes in poor taste.

A simple height reasonable guess is get a stick that is close to the length of your arm, held straight in front of you, to your sighting eye.

Place yourself on a contour with the bottom of the tree.
Hold the stick, carefully, so that your holding fingers are directly level with your sighting eye and the eye end is held gently by the other hand.
Rotate the eye end of the stick up and sight past the top end of the stick and see if it matches the top of the tree.
Move forward or back until the stick top and tree top are in alignment.

This horizontal distance from you to the base of the tree is part of an equal sided right angle triangle. Measure it and you have either the tree's height or the spot that the tree will hit when you fall it that way.

This is not precise. Caveat; try this next to someone else’s home, not yours.

Practice helps. Try it. put a marker there, see how accurate you can fall a tree and how close your measurement was. Consider possible errors from whether your eye is at the same level as the tree base or up a little. Also stump height. Also not being able to see the trees top. Did you forget the contour thingy?

All the best.

 

[M.R.]

I was wondering how a person can measure the height of a tree without using any "wiz-bang" gagets or climbing the tree like a squirrel:greenchainsaw: Couldn't a guy measure out the shadow the tree makes on the ground? (only during cloudless sunny days) :help: That is a prefect scenerio of coarse! I think this was a question on my college math test a long time ago? Ok, I'm going to wait for someone to chim-in some expert advice.

Easiest way I can think of is with a Clinometer

http://www.benmeadows.com/store/item/102200/
also might do a search for a ' Blume-Leiss Altimeter '

 

[upandcommer]

for stihl kid

Your method does work useing the theorum of similar triangles you need to measure the shadow of a tree and an object of known height. Then the length of the shadow of the known object is set up as a ratio to the measurement of the object itself since you took both measurements at the same time their ratios are the same as the height of the tree to the shadow of the tree. So you set up the ratio the same with the height of the tree as the unknown you are solving for. THis meathos is also very valuable for different parts of the tree i.e. height to first branch etc.... when done correctly i have been within a 1/2 an inch of the height of the tree this way. This only works because the angles are the same on both triangles so you must measure both shadows at the same time as the earth does rotate thus changeing the angle so 5 minutes does make a small difference.

 

[ray benson]

Smokechaser's method is really pretty easy. EKKA even made a video to show the method.
http://www.arboristsite.com/showthread.php?t=35362&highlight=tree+height

 

[WoodTick007]

Depends how high your breasts are.

With b oth hands

 

[fishhuntcutwood]

Didnt expect that comment

Me neither!

 

[SawTroll]

- but it is true.......

 

[adkranger]

- but it is true.......