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Report, 1997

Guided transect sampling : an outline of the principle

Lämås, Tomas; Ringvall, Anna; Ståhl, Göran


Guided transect sampling is primarily intended for the sampling of sparse, geographically scattered, populations for which there exist no list of the units. Basically, it consists of a two­ stage design, using wide strips in the first stage and a subsampling procedure in each strip in the second stage. The subsampling is guided by prior information, e.g. in the form of remote sensing image data. Different strategies can be used for the guidance, resulting in different probabilities of inclusion of population units, and consequently in slightly different estimators. The general principle for second stage subsampling guidance can be coupled with a number of methods for how the samples should be selected along the "guided route". Strip sampling, line transect sampling, adaptive cluster sampling, and plot sampling are examples of methods that can be used. However, in the theoretical set-up of the method, it is assumed that all objects in grid-cells passed by the survey transect are found. The grid-cells, covering the entire area under study, also contain the covariate data that are used for directing the sampling effort.


sampling; statistical methods; animal population; plant population; population density

Published in

Arbetsrapport / Sveriges lantbruksuniversitet, Institutionen för skoglig resurshushållning
Publisher: Institutionen för skoglig resurshushållning, Sveriges lantbruksuniversitet