Correction for slope in point and transect relascope sampling of downed coarse woody debris.
Abstract
Abstract
In this article, the effect of sloping terrain on estimates in point and transect relascope sampling (PRS and TRS, respectively) is studied. With these inventory methods, a wide angle relascope is used either from sample points (PRS) or along survey lines (TRS). Characteristics associated with line-shaped objects on the ground are assessed, e.g., the length or volume of downed logs. In their basic forms, the methods only work in flat terrain, and thus bias is incurred under sloping conditions. Two different possibilities to correct for bias due to slope are presented. The first one involves using a slightly modified relascope device and making a measurement of the angle of inclination of each sampled object. The second involves applying correction factors based on the steepness of the terrain in the area surveyed. However, it is shown that moderate slopes cause only limited bias and in such cases there is little need to adjust the measurement procedures or apply correction factors.
Department
Natural Resources and the Environment
Publication Date
2-1-2002
Journal Title
Forest Science
Publisher
Society of American Foresters
Document Type
Article
Recommended Citation
Ståhl, G., Ringvall, A., Gove, J.H., Ducey, M.J. Correction for slope in point and transect relascope sampling of downed coarse woody debris. (2002) Forest Science, 48 (1), pp. 85-92.