We are a specialist supplier of diameter tapes for logging, tree diameter/girth and extended length measuring. Our wide variety of logging tapes incudes the legendary Spencer logging tape, used by the industry for over 40 years. We also carry refills and spare parts.
To measure the diameter of a tree, the diameter tape (diameter side facing user) is wrapped around the tree, in the plane perpendicular to the axis of the trunk at 4.5 feet (1.4 m) above ground (or 4.27 feet (1.30 m), depending on the location) . Where the number "0" aligns with the rest of the tape, the diameter can be read directly from the tape, for a relatively round and smooth tree trunk as shown.
Precision diameter tapes are used for measuring the true diameters of both round and out-of-round forms. Used in the metal working industry, these tapes are precision tools made of 1095 clock spring steel.
Logging tapes from Spencer are designed for heavy-duty use in the logging industry. Available in a number of lengths and scales designed to measure the diameter of trees, these tape measures are used by loggers, arborists and other forestry specialists.
This measurement of a tree's diameter can be measured either using calipers, or by using a tool called DBH tape. What is special about DBH tape is it measures the circumference of the tree, and converts this measure to the diameter by dividing by Pi (i.e. the long number 3.14159....). This division is done on the tape, so that every 3.14 cm along the tape, is labeled as one cm. This makes it easy because no calculations are required when using the DBH tape to measure tree diameter.
There you have it - a DBH tape of your very own. Now you can go out and wrap them around trees and know exactly what their diameter is! Then you can return in a year and measure the same trees and see if they've grown! Enjoy.
Diameter at Breast Height (DBH) can be measured quickly with a specially calibrated diameter tape, often referred to as a d-tape, that displays the diameter measurement when wrapped around the circumference of a tree. If you don't have access to a d-tape, you can find the diameter of the tree using a string, a measuring tape, a thumbtack, and a calculator.
Spencer Logger's Tape is Spencer Products' original Logger's Tape. The Spencer's Loggers Tape is available in three different lengths: 50', 75' and 100' and metric tapes as well. Each Spencer Logger's Tape is housed in a heavy duty aluminum casing with a swivel clip on the end for hanging on a belt loop or tool belt. Spencer Logger's Tapes have a fast automatic return and steel gears and pinion.
Fast and accurate method of measuring tree trunk diameter, this high quality fibreglass tape has a hooked end with diameter printed on one side and circumference on the other.10m lengthEasy wind handle with rubberised body & strap attachment pointHigh accuracy & visibility, non-conductiveVent holes moulded into case to help prevent build up of dirt and sawdustTape width: 12.5mm, physical dimensions: 155x127mm x30mm deepHigh quality. Made in Japan
Outside diameter circumference fiberglass tape measure is a heated product in the category of diameter tape by Wintape. The professional and accurate measuring tool has a hard and strong ABS case that keeps its inner retraction mechanism and the soft fiberglass tape from impact and dirt. We provides personalized services by the company logo printing and custom color.
Measuring the circumference of a leaning tree is not a difficult task. Wrap the measuring tape around the leaning tree at breast height (about 1.35 m from the ground) along the underside face of the trunk to measure its circumference.
Amongst forest measurements, the most common and easily obtained tree measurement is diameter at breast height (DBH). DBH is defined as average outside bark diameter when measured on the uphill side of a tree at 4.5 feet (Avery and Burkhart 2002). DBH is commonly measured with a diameter tape (D-tape), which is designed to allow users to measure circumference at 4.5 feet (1.3 meters) and convert to a measurement of diameter (diameter = circumference/pi [where pi = 3.14]). The converted diameter readings are printed on the D-tape for quick and efficient field work. The following video shows techniques for using a D-tape: =B67QPJa2pbM&list=PLr5M0QvUoAel1dKnwLvt9EF5lEtzolyTw&index=4. DBH can also be measured using calipers or Biltmore sticks.
If the bole or stem of a tree were shaped like a true cylinder, the calculation of volume in the stem would be simple. However, most tree stems taper as you move higher in the tree. Therefore, upper diameters along the stem are also important components of volume equations. The stem diameter at the small end of the first log (16 feet in the eastern United States) is often critical for determining the rate of taper in the stem and is used in many of the traditional log rules to generate volume estimates.
The final variable needed to calculate total tree volume is a measurement of the amount of stem taper in a tree. In general, tree diameter decreases with increasing tree height (like a cone). The environment in which a tree exists can influence the rate at which this taper occurs. For example, trees grown in close proximity to competitors (e.g., in a plantation) will tend to taper less than those grown in open areas. The characterization of this rate of taper is referred to as form class and is primarily expressed using the Girard form class. To determine Girard form class, the inside bark diameter at the top of the first log is expressed as a percentage of DBH. For example, if a tree has a 16.0-inch DBH and is 12.8 inches (inside bark diameter) at the top of the first log, the form class would be 80 (i.e., 100*12.8/16 = 100*0.8). This upper diameter measurement is taken at a height of 17.3 feet to accommodate a one-foot stump and 0.3 feet of log trimming. Form class measurements for southern pine plantations generally range from 78 to 82. Although this four-percent difference in form class seems miniscule, a three-percent change to merchantable volume can be attributed to a one-percent difference in form class (Avery and Burkhart 2002). In other words, even a small mistake in form class can result in a large error when merchantable volume is calculated. To ensure accuracy when determining form class for a stand, it is recommended that a small subsample of trees be carefully measured to determine the form class for the entire stand.
3. Practice Fieldwork Skills. Before going into the field, make sure everyone understands basic measurement with a tape measure. Students will be measuring 37.24 foot boundary lines, and 4.5 foot heights for future tree diameter measurements. 781b155fdc