Skip to Main Content
Edge Effects in Line Intersect Sampling WithAuthor(s): David L. R. Affleck; Timothy G. Gregoire; Harry T. Valentine
Source: Journal Agricultural, Biological, and Environmental Statistics 10:460-477
Publication Series: Scientific Journal (JRNL)
Station: Northeastern Research Station
PDF: View PDF (1.6 MB)
DescriptionTransects consisting of multiple, connected segments with a prescribed configuration are commonly used in ecological applications of line intersect sampling. The transect configuration has implications for the probability with which population elements are selected and for how the selection probabilities can be modified by the boundary of the tract being sampled. As such, the transect configuration also affects the performance of methods designed to eliminate edge-effect bias. We show that the reflection method solves the edge-problem for designs that use symmetric radial transects (e.g., straight-line and X-shaped transects centered at the sample point). This method also applies to designs that use asymmetric radial transects, provided the orientation is selected uniformly at random. Asymmetric radial transects include straight lines emanating from the sample point, and L- and Y-shaped transects. The reflection method does not apply to designs where polygonal transects (e.g., triangular, square, and hexagonal transects) are used, or where the orientations of asymmetric radial transects are fixed. We provide a new method that eliminates edge-effect bias for designs that use asymmetric radial transects with fixed orientation, but a workable solution for polygonal transects remains elusive.
- Check the Northern Research Station web site to request a printed copy of this publication.
- Our on-line publications are scanned and captured using Adobe Acrobat.
- During the capture process some typographical errors may occur.
- Please contact Sharon Hobrla, firstname.lastname@example.org if you notice any errors which make this publication unusable.
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationAffleck, David L. R.; Gregoire, Timothy G.; Valentine, Harry T. 2005. Edge Effects in Line Intersect Sampling With. Journal Agricultural, Biological, and Environmental Statistics 10:460-477
KeywordsBoundary overlap, Inclusion region, Reflection method, Transect configuration
- Design unbiased estimation in line intersect sampling using segmented transects
- Corrections for Cluster-Plot Slop
- Line intersect sampling: Ell-shaped transects and multiple intersections
XML: View XML