Skip to main content
Research article - Peer-reviewed, 1997

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

Ståhl, Göran


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.


coarse woody debris; forest inventory; line intersect sampling; Monte Carlo; simulation; transect relascope sampling

Published in

Scandinavian Journal of Forest Research
1997, Volume: 12, number: 4, pages: 375-381

    SLU Authors

    • Ståhl, Göran

      • Department of Forest Resource Management and Geomatics, Swedish University of Agricultural Sciences

    UKÄ Subject classification

    Forest Science

    Publication Identifiers


    Permanent link to this page (URI)