An Efficient Sampling Design for Forest Inventory: The Northeastern Forest Resurvey
The sampling design described was developed at the Northeastern Forest Experiment Station to provide data to meet a pre-set standard of accuracy at least cost for the Forest Survey of the Northeast as the second surveys of these states are made. The principles are equally valid for any extensive forest area of as much as 150 square miles. The essentials of the method are: an initial stratified inventory with some remeasurable plots; remeasurement of some of the initial plots; and establishment of some new plots in a stratified sample. It amounts to stratified double sampling at the first occasion followed by sampling with partial replacement at the second. Formulas are presented for estimating total volumes and areas and their sampling errors, and for calculating numbers of plots to establish and remeasure to meet an accuracy goal. Current statistics are obtained by using regression techniques with data from remeasured plots to update statistics from the initial survey; these updated statistics are then combined with estimates from a new set of data. Estimates of change are obtained from the remeasured plots. The design is readily amenable to local intensification, if desired, and the principle of sampling with partial replacement is useful even if the first sample was unstratified. This design should be of particular interest to those concerned with repeated inventories of extensive forested areas who would like to obtain required data at least cost.
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Document Type: Journal Article
Affiliations: Assistant Professor of Forestry, Iowa State University, Ames., Formerly served at the Northeastern Forest Expt. Sta.
Publication date: 1963-11-01
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