English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Zendy Plus

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Zendy Tools

Zendy Open

Experimentors have been using cost-efficient systematically located transects in the line intercept method for some time with little support from mathematical statistics. In this paper, it is shown that for rectangular regions the usual line intercept estimators for cover, density, and other attributes are unbiased for certain systematic sampling plans. The estimators are approximately unbiased for “large” irregularly shaped study regions. Consider line intercept sampling in a situation in which particles or items to be sampled are distributed across a study region. In general, the particles may be of any shape and size and may possess an arbitrary spatial distribution. For instance, the particles may be shrubs or patches of vegetation in a field, cells on a slide, or the projection of logs on the forest floor. It is often of interest to study certain quantitative characteristics of these particles. One might be interested in the number of particles per unit area, density, the proportion of the study region covered by particles, percentage cover, or such attributes as weight, size, yield, biomass, etc. Consider a study region of area A and define the following parameters (usually unknown and to be estimated): N = The total number of distinct particles in the study region. D = N/a = Density, the number of particles per unit area. ai = The area covered by particle, i, +I,2 ,..., N. c= +I = Percentage cover, the proportion of the study A region covered by the particles. Xi = Any fixed, measurable attribute associated with the ith particle, i=1,2 ,..., N.

Unbiased Systematic Sampling Plans for the Line Intercept Method