Adjustments to forest inventory and analysis estimates of 2001 saw-log volumes for Kentucky

Stanley J. Zarnoch; Jeffery Turner

doi:10.2737/SRS-RP-38

Treesearch

Adjustments to forest inventory and analysis estimates of 2001 saw-log volumes for Kentucky

Informally Refereed

Authors:

Stanley J. Zarnoch, Jeffery Turner

Year:

2005

Type:

Research Paper

Station:

Southern Research Station

DOI:

https://doi.org/10.2737/SRS-RP-38

Source:

Res. Pap. SRS-38 Asheville, NC: U.S. Department of Agriculture, Forest Service Southern Research Station. 4 p.

Download (PDF 389 KB)

Download (PDF 389 KB): https://research.fs.usda.gov/download/treesearch/21076.pdf

Abstract

The 2001 Kentucky Forest Inventory and Analysis survey overestimated hardwood saw-log volume in tree grade 1. This occurred because 2001 field crews classified too many trees as grade 1 trees. Data collected by quality assurance crews were used to generate two types of adjustments, one based on the proportion of trees misclassified and the other on the proportion of saw-log volume misclassified. Measures of variability for the estimated proportions were based on a cluster sampling design. Both methods significantly reduced estimated saw-log volume in tree grade 1. We believe that the saw-log volume approach is superior to the tree approach, but that both approaches generate improved estimates of tree grade saw-log volumes. The standard errors of the adjustment proportions are given and can be used to calculate standard errors of the adjusted values.

Keywords

Cluster sampling, Forest Inventory and Analysis, quality assurance, saw-log, tree grade

Citation

Zarnoch, Stanley J.; Turner, Jeffery A. 2005. Adjustments to forest inventory and analysis estimates of 2001 saw-log volumes for Kentucky. Res. Pap. SRS-38 Asheville, NC: U.S. Department of Agriculture, Forest Service Southern Research Station. 4 p.