Transect relascope sampling for assessing coarse woody debris: The case of a π/2 relascope angle

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

• Ståhl, Göran

  • Institutionen för skoglig resurshushållning och geomatik, Sveriges lantbruksuniversitet
    

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