Forest Inventory Glossary

Revision as of 14:03, 24 March 2011

A

Areal sampling frame

The sampling frame or continuum (area) from which dimensionless samples points are selected.

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C

Cluster plot

Sample plot that is composed of unconnected sub plots.As the subplots are not selected independently, a cluster gives only one observation.

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DBH

Diameter at breast height (1.3 meter).

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Expansion factor

Reciprocal of the inclusion probability. The factor with which observations have to be multiplied to derive an estimate of the total (or per hectare).

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I

Inclusion probability

Probability that a single population unit is included in a sample based on the actual plot design.

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O

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Sample plot

A certain area or "decision rule", defining which population units are to be included at each sample point.

Sampling intensity

Proportion of the population that is been sampled. In forest inventories the area proportion that was observed in the sampling study.

Sample size

Number of samples drawn from a defined sample frame.

Selection probability

Probability that a unique set of k population units is selected as sample based on the actual plot design. In case that k=1 similar to the inclusion probability.

Spatial autocorrelation

Or: "Self-correlation" describes the relationship between two observations of the same variable, taken at two different objects or times.

Standard Error

Standarddeviation of the sample means.

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U

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X