Forest measurement with relascope : practical description for fieldwork with examples for Estonia
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Kuupäev
2013
Kättesaadav alates
Autorid
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Formaks
Abstrakt
The relascope and relascope measurement was invented
and introduced by Austrian forest scientist Walter Bitterlich
(Bitterlich 1947, 1948). The method is widely used because
it is simple, handy and quick. However, the method is
less accurate when compared to cross-callipering forest
measurement. It is used for the preliminary assessment of
timber supply in a tree stand 1.
Simplified relascope is also called “simple relascope”,
“angle-counter”, “angle-gauge” or “angle-template”. S
ocalled
true relascope or mirror-relascope is a device that
can automatically adjust its measured values according
to the slope of the ground (photo 1).
Electronic relascope can be used instead of traditional
mirror-relascope (e.g. Masser RC3, photo 2). Ground
slope can be adjusted automatically by inserting slope
angle value.
Measurement result must be adjusted when using
simplified relascope on slopes with angle exceeding 8°. Simplified relascope consists of a chain or non-stretching
rope with precise length and rigid slab attached to it.
The slab has one or more apertures with precise width
(photo 3). It is also possible to create simplified relascope
on one’s own, provided that aperture width and chain/
rope length have the greatest precision. Aperture width
must remain within tolerance range of 0.1 mm and the
length of the chain/rope within the range of 1 mm
(Kohava 2002). Instead of a slab, a pen with round crosssection
can also be used (photo 4).
Kirjeldus
Title of the original: Metsa relaskoopmõõtmine. Puistu rinnaspindala, täiuse ja mahu
määramine lihtrelaskoopi kasutades.
Märksõnad
forests, forest stands, forest evaluation, forest taxation, forest measurement, relascope measuring, volume tables