Introdution This dataset contains six sets of biodiversity atlas datathat have been used as a test of occupancy downscaling methods. They are derived from two taxonomic groups, vascular plants and birds and are either regional or national atlases. The original atlas have already been published and the references are below. Should these data be used these citations should be used. File contents Each zip file contains a set of text files, one for each taxa. Each text file has three tab seperated columns, longitude, latitude and presence. The presence column indicates whether the grid cell was occupied (1) or unoccupied (0). The longitude and latitude columns are the grid references of each grid cell surveyed. For Ireland the Irish grid system is used (EPSG:29903); for the UK the Ordnance Survey Grid (EPSG:27700) and for Belgian the Lambert 72 system (EPSG:31370). The grid cell area for all plant datasets is 4 km 2 . Whereas the grid areas for the Flemish birds is 25 km 2 and for the Irish breeding birds is 100 km 2 . References Evans, P., Evans, I. & Rothero, G. (2002) Flora of Assynt: fowering plants and ferns. P.A. Evans and I.M. Evans. ISBN 0954181301. Forbes, R.S. & Northridge, R.H. (2012) The Flora of County Fermanagh. National Museums Northern Ireland. ISBN 1905989288 Halliday, G. (1997) A Flora of Cumbria. Centre for North-West Regional Studies, University of Lancaster. ISBN 1862200203. National Biodiversity Data Centre (2011) The Second Atlas of Breeding Birds in Britain and Ireland: 1988-1991. URL https://doi.org/10.15468/pkhsnb Shropshire Ecological Data Network (2017) Shropshire Ecological Data Network database. Occurrence Dataset. URL https://doi.org/10.15468/5v5pvk Lockton, A.J. & Whild, S.J. (2015) The Flora and Vegetation of Shropshire. Shropshire Botanical Society. ISBN 0953093727. Vermeersch, G., Anselin, A., Devos, K., Herremans, M., Stevens, J., Gabriëls, J., Van Der Krieken, B., Brosens, D. & Desmet, P. (2014) Broedvogels - Atlas of the breeding birds in Flanders 2000-2002. ...