Provider: Ingenta Connect
Database: Ingenta Connect
Content: application/x-research-info-systems
TY - ABST
AU - Flewelling, James W.
AU - Strunk, Jacob L.
TI - The Walk Through and Fro Estimator for Edge Bias Avoidance
JO - Forest Science
PY - 2013-04-16T00:00:00///
VL - 59
IS - 2
SP - 223
EP - 230
KW - edge overlap
KW - boundary
KW - edge bias
KW - horizontal point sampling
N2 - Edge bias can result from the failure of sampling estimators to account for the true sampling probabilities of trees near the edges of a stand. Numerous estimators for basal area, each with an associated sampling method, have been proposed so as to avoid or reduce edge bias. The “walkthrough”
estimator by Ducey et al. (2004) is easier to use than most competitors. A modification of that estimator is proposed here and referred to as the walk through and fro estimator. Along the line that connects the sample point and a particular sample tree, distances from the tree to any intersected
stand boundaries are recorded if those distances are shorter than the radius of the conceptual tree-centered plot. The recorded distances are used to calculate sample weights that allow for unbiased estimation of basal area under all circumstances. The mean squared error for this estimator
is generally less than that of the walk through estimator but greater than that of the tree-concentric estimator. Several variations on the proposed estimator are described.
UR - http://www.ingentaconnect.com/content/saf/fs/2013/00000059/00000002/art00009
M3 - doi:10.5849/forsci.10-135
UR - https://doi.org/10.5849/forsci.10-135
ER -