DBH (diameter at breast height measurement

[mdvaden]

Its usually rather easy, for single trunk trees. You folks refer to meters or cm, etc., whereas we often inches or feet and DBH is 4.5 ft. above grade.

 

But it's 4.5 feet above average grade --- the middle between the high side and low side of the trunk if there is a slope. And that's typically one of few complicated things if it happens.

 

A diameter tape is not essential. Almost any tape that has inches, feet, centimeters, etc., will work.

 

This tree below has like a 2m difference between the trunks high side and low side.

[Timber Man]

Its usually rather easy, for single trunk trees. You folks refer to meters or cm, etc., whereas we often inches or feet and DBH is 4.5 ft. above grade.

 

But it's 4.5 feet above average grade --- the middle between the high side and low side of the trunk if there is a slope. And that's typically one of few complicated things if it happens.

 

A diameter tape is not essential. Almost any tape that has inches, feet, centimeters, etc., will work.

 

This tree below has like a 2m difference between the trunks high side and low side.

 

Most UK milling hardwood and better quality softwood is still measured in hoppus/cubic feet . Girth was always taken at roughly 5 ft then mid girth good be worked out by estimating multiples of 5 ft in the first length .Girth then reduced by 1 whole quarter girth in 5 ft for softwood, and 7ft in hardwood . This method is still widely used to value standing sales.

[mdvaden]

Most UK milling hardwood and better quality softwood is still measured in hoppus/cubic feet . Girth was always taken at roughly 5 ft then mid girth good be worked out by estimating multiples of 5 ft in the first length .Girth then reduced by 1 whole quarter girth in 5 ft for softwood, and 7ft in hardwood . This method is still widely used to value standing sales.

 

5 ft. is pretty close to 4.5 ft.

 

There is variation between some countries but the difference makes little difference most of the time.

 

I think Canada is one nearby country that measures dbh slightly higher than in the USA

[Timber Man]

5 ft. is pretty close to 4.5 ft.

 

There is variation between some countries but the difference makes little difference most of the time.

 

I think Canada is one nearby country that measures dbh slightly higher than in the USA

 

No, I agree it makes little difference. As long as the tree is girthed clear of buttresses it is still possible to get a quite accurate mid quarter girth by reducing in multiples of length/girth, working on a standard taper.