Ståhl, Göran
- Institutionen för skoglig resurshushållning och geomatik, Sveriges lantbruksuniversitet
Sammanfattning
In transect relascope sampling, a wide-angle relascope is used along survey lines for selecting a sample of objects that extend linearly in the plane, e.g. downed logs. The method is closely related to line intersect (intercept) sampling. In this article, a special case of the transect relascope technique is studied. Using a pi/2 radian relascope angle, the method becomes invariant to the orientation of the line objects in the population. The reason is that the area of inclusion around objects, through which a survey line should pass for an object to be included, turns out to be circular. In analytical studies and Monte Carlo simulations, the cost-efficiency of transect relascope and line intersect sampling is evaluated. It is found that transect relascope sampling is a competitive alternative to line intersect sampling in inventories of the total volume of coarse woody debris (in the form of downed logs:) in forest compartments.
Nyckelord
coarse woody debris; forest inventory; line intersect sampling; Monte Carlo; simulation; transect relascope sampling
Publicerad i
Scandinavian Journal of Forest Research
1997, volym: 12, nummer: 4, sidor: 375-381
Utgivare: SCANDINAVIAN UNIVERSITY PRESS
SLU författare
UKÄ forskningsämne
Skogsvetenskap
Publikationens identifierare
- DOI: https://doi.org/10.1080/02827589709355426
Permanent länk till denna sida (URI)
https://res.slu.se/id/publ/41914