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The old trees trunk’s volume determination with use of theodolite

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Author(s): Robert Tomusiak | Paweł Zarzyński

Journal: Rocznik Dendrologiczny
ISSN 0860-2646

Volume: 55;
Start page: 9;
Date: 2007;
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Keywords: monuments of nature | volume | measurement | theodolite | dendrometry

ABSTRACT
Tremendous ancient trees have always impressed humans very much. They have been a topic of many stories and legends and also objects of the cult. The fascination with huge trees can be expressed by the willingness to explore their dimensions and to state which tree is the biggest one. That gives the opportunity to make various comparisons. The most often determined parameters include stem girth or diameter (usually measured at the height of 1,30 m), crown diameter and stem volume. Usually, it is not too difficult to measure the previous features, for the measurements can be executed using some simple instruments. However, correct determination of the stem volume is a bigger challenge. In this paper we deal with that problem. Traditional methods of volume determination can not be accurate for monumental ancient trees of untypical shape. Therefore, we need to search for non-standard, indirect mensuration methods, for example the use of the theodolite. Application of some trigonometric formulae to the results of the traditional measurements of the diameter not that high above the ground (for example at the breast height) and the distance between the stem and the theodolite, enable very precise to determine diameters at any height as well as the height of the tree. The way of doing it is described in the paper: placing the instrument, leveling, centering and measurement of both vertical and horizontal angles. The trigonometric formulae for determination stem characteristics are given. The use of the method is presented on the example of monumental Oak tree for determination of a log volume by Smalian sectional formula.The described method of indirect tree measurements seems to have a wide spectrum of applications in mensuration of various species as well as various stem shapes and dimensions. The results obtained from theodolite measurements can be used for stem volume determination, not only by application in simple formulae, but also in more precise sectional formulae. The method is rather time-consuming but its use for measurements of monuments of nature gives reason to do it
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