British Wildlife 24.5 June 2013

The grid-mapping of species at sites

The large-scale distributioin of species is commonly documented by a grid-mapping approach, whereby a grid is placed over a study area and the presence or absence of each species within each grid cell is determined. The Ordnance Survey grid is used as a common standard in Britain, and the resolution used is commonly 2 x 2km (tetrads) for countries and 10 x 10km (hectads) for countries. 

Identification: British Tiger-beetles Comment: Conservation grazing of heathland – where is the logic?
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