In this article, we tried to perform the drawing of forest maps, together with the calculations involved, automatically by means of relatively simple aids. The computer unit used is an office computer Olivetti P203. As an example the growing stock (in m3/ha) was mapped out. The proper inventory in the field is done according to the classical method by means of a previously fixed network of squares (70,7 m x 70,7 m), which corresponds to two plots a ha. The quantity which is measured and mapped out (in this case the growing stock) is in a similar form not very useful in mapping. Therefore a division in classes (Ku) numbered from 0 to 9, is set up. An appropriate program calculates for a certain number of points within this elementary square, to which class they have to be assigned, whereas the typewriter prints the corresponding code number on the right place. Fig. 1 and the formulas (1), (2) and (3) represent the principle o[ the calculations while fig. 2A and B reproduce the results printed by the typewriter for a elementary square of respective 1” X 1” and 2” X 2”. The whole of similar network of squares eventually results in a basical document, on which the existing forest map with an adapted scale is laid (see appendix 3) and the class limits are drawn. If desirable, the scale may be adapted when the forest map under discussion is definitely reproduced.
Anisotropic Jüttner (relativistic Boltzmann) distribution
