# Diameter tape

Diameter tape

A Diameter tape (D-tape)is a form of dendrometer that consists of a cloth or metal tape that is mainly used to measure diameter at breast height (DBH). DBH is measured at a fixed height of 4.5 feet (137.16 cm) above the ground, where it is most convenient to measure diameter. DBH is measured up high so to avoid measuring a tree's butt swell. Butt swell is where the base of the tree is unconventionally fatter than the rest of the tree. height and diameter are used to determine the volume of a given tree, measuring above the butt swell is required to provide the most accurate measurement.[1]

Diameter is easily measured because the tape is calibrated in units of 3.14(pi) inches or centimeters. The tape is actually measuring the trees circumference but since circumference and diameter are related by pi, the diameter can easily be obtained.The only problem with the diameter tape is that the measurements assume the tree's trunk cross-sections are perfectly circular. Thus the diameter tape just gives an approximation, regardless it is the most commonly used dendrometer for DBH.[2]

Precision diameter tapes are used for measuring the true diameters of both round and out-of-round forms. Used in the metalworking industry, these tapes are a precision tool made of 1095 clock spring steel.precision diameter tapes

The precision diameters gages consist of a narrow metal ribbon bearing special graduations. These graduations are designed to convert circumferential distance into diameter measurement so the observer can read the diameter directly from the scale.

The tapes are checked over master gages at .001'"(.03mm) accuracy for standard tapes up to 144" (3600mm). [3]

## Measuring Diameter

To calculate the diameter of a tree, wrap the tape(diameter side facing user) around the tree at 4.5 feet (137.16 cm) above ground. Where the number "0" aligns with the rest of the tape, this is the diameter of the tree.

Measurement of tree DBH at 4.5 feet above ground, making sure that the tape is perfectly level and that the tape is not kinked, so as not to skew the reading of the diameter

## References

1. ^ http://www.cnr.vt.edu/dendro/forsite/dtape.htmAs
2. ^ Moran,L.A, and R.A Williams.2002. Comparison of three dendrometers in measuring diameter at breast height. Northern Journal of Applied Forestry 19:28-33.
3. ^

Wikimedia Foundation. 2010.

### Look at other dictionaries:

• Diameter Tape — A Diameter Tape(D Tape)is a form of dendrometer that consists of a cloth or metal tape that is mainly used to measure diameter at breast height (DBH). DBH is measured at a fixed height of 4.5 feet (137.16 cm), where it is easiest for most people… …   Wikipedia

• diameter tape — noun : a measuring tape so scaled that when it encircles a tree trunk the diameter is read directly …   Useful english dictionary

• Diameter at breast height — Diameter at breast height, or DBH, is a standard method of expressing the diameter of the trunk or bole of a standing tree. DBH is one of the most common dendrometric measurements. Tree trunks are measured at the height of an adult s breast,… …   Wikipedia

• Audio tape length and thickness — Since the widespread adoption of reel to reel audio tape recording in the 1950s, audio tapes and tape cassettes have been available in many formats. This article describes the length, tape thickness and playing times of some of the most common… …   Wikipedia

• Magnetic tape data storage — uses digital recording on to magnetic tape to store digital information. Modern magnetic tape is most commonly packaged in cartridges and cassettes. The device that performs actual writing or reading of data is a tape drive. Autoloaders and tape… …   Wikipedia

• Outline of forestry — See also: Index of forestry articles The following outline is provided as an overview of and guide to forestry: Forestry – the art and science of managing forests, tree plantations, and related natural resources. Forest ecosystems have come to be …   Wikipedia

• Biltmore stick — A Biltmore stick is a tool sometimes used to measure various tree dimensions, such as diameter at breast height and height. It looks much like an everyday yardstick. A Biltmore stick is considered to be only marginally accurate. Some foresters… …   Wikipedia

• Wedge prism — The wedge prism is an optical element typically made of glass ground at slight angles to refract light passing through it from the smaller width side of the prism to the thicker width side of the prism. By refracting the light, the wedge prism… …   Wikipedia

• printing — /prin ting/, n. 1. the art, process, or business of producing books, newspapers, etc., by impression from movable types, plates, etc. 2. the act of a person or thing that prints. 3. words, symbols, etc., in printed form. 4. printed material. 5.… …   Universalium

• Gramophone record — A 12 inch (30 cm) 33⅓ rpm record (left), a 7 inch 45 rpm record (right), and a CD (above) A gramophone record, commonly known as a phonograph record (in American English), vinyl record (in reference to vinyl, the material most commonly used after …   Wikipedia