Dataset Open Access

GRTS master sample for habitat monitoring in Flanders

Onkelinx, Thierry; Westra, Toon; Vanderhaeghe, Floris

Spatially balanced sample for the whole of Flanders and the Brussels Capital Region based on the Generalized Random-Tessellation Stratified (GRTS) method (Stevens and Olsen, 2004). The sample consists of a grid of 32 meter x 32 meter cells, each having a unique ranking number. This so-called master sample is used as a basis to draw samples for different Natura 2000 habitat types in Flanders. A sample with sample size n for a certain habitat type is selected as follows: (1) select all grid cells of the master sample that overlap with the sampling frame of the target habitat type and (2) select the n grid cells with the lowest ranking number.

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  • Stevens D.L. & Olsen A.R. (2004). Spatially Balanced Sampling of Natural Resources. Journal of the American Statistical Association 99 (465): 262–278. DOI:

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