Biltmore stick

The Stockpeilung is a method to estimate the height of a relatively related object. It is carried out mainly by forest workers and forest rangers for determining the size of trees.

Background

This estimate is similar to the thumb jump the track conditions, the radiation rate is based. The targeted floor ( dipstick ) on the outstretched arm of an adult is about 70 inches away from his face. With a known distance from the tree, the height of the tree with relative accuracy can be read as a cane. The thumb jump here would be not appropriate because only a horizontal hereby estimation is possible.

Implementation

Variant 1

  • Determine distance to the tree
  • A provided with measuring marks wooden stick of any size is kept high on the outstretched arm.
  • Use the bottom bar marking the tree base is targeted.
  • The marking of the wooden rod over which the tree top, take a bearing, the height of the tree is either directly or after multiplication with a factor.

Advantage: The scale on the rod can be divided so that at a certain distance based tree height can be read off directly. The bearing is possible from any distance from when the measurement result by a factor of which implies the ratio of the tatsählchen Peilentfernung to base distance for the scale, is converted.

Variant 2

  • The stick is held so that the upper end extends just as far over the hand like your own arm is long.
  • Now it is so far from being measured tree backwards until the tree (or par - tops ) and the upper pole section appear the same length.
  • The distance from the current position to the tree corresponds to the height of the tree minus the own eye level.
  • The tree 's height is given by: tree removal standpoint

Advantage: A scale division on the floor is not necessary.

Variant 3

  • However, a similar variant 2, Floor receives two marks: a mark F at arm's length below the pole tip and another marker at a distance H above the eye level of the shoulder joint ( about 17 cm) below F.
  • The stick is used to mark H and held vertically at arms length and targeted via the label F Baumfuß. The outstretched arm and the line of sight over F now form ideally a parallelogram.
  • Now it is so far from being measured tree backwards until about the pole tip of Baumfuß to the top of the tree and be targeted simultaneously over F.
  • The distance from the current position to the tree corresponds to the height of the tree.

Advantage: The measurement also works in steeply sloping terrain and for measurements of sections in the crown of the tree.

744247
de