Table 1. Data sets used to generate environmental variables for the analysis of highly pathogenic avian influenza (HPAI) H5N1 occurrences in wild birds in Europe, with data format and source.

Category Description of data sets Format Data producer
Anthropogenic environmental data Cities Polygon ESRI
Metropolises Polygon ESRI
Roads Polyline ESRI
Highways Polyline ESRI
Railways Polyline ESRI
Human population density in 2005 Raster CIESIN, FAO, CIAT
Poultry density in 2005 Raster FAO
 

Physical environmental data

Digital elevation model Raster WORLDCLIM
Global lakes and wetlands database Raster WWF, ESRI, CESR
Ramsar sites Point Wetlands International
Mean annual potential evapotranspiration Raster CGIAR-CSI
Mean annual aridity index Raster CGIAR-CSI
Mean monthly precipitation Raster WORLDCLIM
Mean monthly maximum temperature Raster WORLDCLIM
Mean monthly maximum temperature Raster WORLDCLIM
Monthly NDVI Raster NASA